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“BSCI – Building Scaleable Cisco Internetworks”, also known as 642-901 exam, is a Cisco certification.With the complete collection of questions and answers, Pass4sure has assembled to take you through 353 Q&As to your 642-901 Exam preparation. In the 642-901 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
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Feedbacks

* “Passed BSCI with 933/1000 on 08-Sep-2008

Most of the questions are from P4S 3.10 some 1-2 questions are not from P4S.
One question regarding DHCP-DISCOVER messages, another regarding OSPF ABR.
not really difficult if you have understood the concepts.

In the lab questions tab and ? worked. This was really useful to me. Also you can use the shorten form ‘en’ , ‘copy run start’ etc.
Use show run to get EIGRP AS number, OSPF Process ID etc. Finally I verified my configuration using sh run, sh ip route etc.

I studied with Authorized Guide then Revised P4S in the final week.
The explanations in Auth guide was very clear and detailed enough for me.

My view is dont just cram P4S. know the theory, understand ‘why’. then your chances of failing the exam is minimum.”

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BSCI – Building Scaleable Cisco Internetworks
Exam Number: 642-901 Exam
Associated Certifications: BSCI – Building Scaleable Cisco Internetworks
Duration: 353 Q&As
Available Language(s): English
Exam Details
The Building Scalable Cisco Internetworks (BSCI 642-901) is a qualifying exam for the Cisco Certified Network Professional CCNP®, Cisco Certified Design Professional CCDP®, and Cisco Certified Internetwork Professional CCIP™ certifications. The BSCI 642-901 exam will certify that the successful candidate has important knowledge and skills necessary to use advanced IP addressing and routing in implementing scalability for Cisco ISR routers connected to LANs and WANs. The exam covers topics on Advanced IP Addressing, Routing Principles, Multicast Routing, IPv6, Manipulating Routing Updates, Configuring basic BGP, Configuring EIGRP, OSPF, and IS-IS.

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QUESTION 1:
Certkiller uses EIGRP as the primary routing protocol in their network. How does
EIGRP advertise subnet masks for each destination network?
A. EIGRP advertises a fixed length subnet mask for each destination network.
B. EIGRP advertises only a classful subnet mask for each destination network.
C. EIGRP, like IGRP and RIP, does not advertise a subnet mask for each destination
network.
D. EIGRP advertises a prefix length for each destination network.
E. None of the above
Answer: D
Explanation:
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary routing
protocol based on IGRP. Unlike IGRP, which is a classful routing protocol, EIGRP
supports CIDR, allowing network designers to maximize address space by using CIDR
and VLSM. Compared to IGRP, EIGRP boasts faster convergence times, improved
scalability, and superior handling of routing loops.
The prefix length field signifies the subnet mask to be associated with the network
number specified in the destination field. Thus, if an EIGRP router is configured as
follows:
1. ip address 172.16.1.1 255.255.255.0
it will advertise 172.16.1.0 with a prefix length of 24.
Likewise, if the router is configured as follows:
1. ip address 172.16.250.1 255.255.255.252
it will advertise 172.16.250.0 with a prefix length of 30.
QUESTION 2:
The Certkiller network uses EIGRP. Identify three characteristics of EIGRP feasible
successors? (Select three)
A. Traffic will be load balanced between feasible successors with the same advertised
distance.
B. If the advertised distance of the non-successor route is less than the feasible distance
of best route, then that route is identified as a feasible successor.
C. If the successor becomes unavailable, then the feasible successor can be used
immediately without recalculating for a lost route.
D. The feasible successor can be found in the routing table.
E. A feasible successor is selected by comparing the advertised distance of a
non-successor route to the feasible distance of the best route.
Answer: B, C, E
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Explanation:
Once a neighbor relationship has been formed, called an Adjacency, the routers exchange
routing update information and each router builds its own topology table. The Updates
contain all the routes known by the sender. For each route, the receiving router calculates
a distance for that route based on the distance that is conveyed and the cost to that
neighbor that advertised the particular route. If the receiving router sees several routes to
a particular network with different metrics, then the route with the lowest metric becomes
the Feasible Distance (FD) to that network. The Feasible Distance is the metric of a
network advertised by the connected neighbor plus the cost of reaching that neighbor.
This path with the best metric is entered into the routing table because this is the quickest
way to get to that network.
With the other possible routes to a particular network with larger metrics, the receiving
router also receives the Reported Distance (RD) to this network via other routers. The
Reported Distance being the total metric along a path to a destination network as
advertised by an upstream neighbor. The Reported Distance for a particular route is
compared with the Feasible Distance that it already has for that route. If the Reported
Distance is larger than the Feasible Distance then this route is not entered into the
Topology Table as a Feasible Successor. This prevents loops from occurring. If the
Reported Distance is smaller than the Feasible Distance, then this path is considered to be
a Feasible Successor and is entered into the Topology table. The Successor for a
particular route is the neighbor/peer with the lowest metric/distance to that network.
If the receiving router has a Feasible Distance to a particular network and it receives an
update from a neighbor with a lower advertised distance (Reported Distance) to that
network, then there is a Feasibility Condition. In this instance, the neighbor becomes a
Feasible Successor for that route because it is one hop closer to the destination network.
There may be a number of Feasible Successors in a meshed network environment, up to 6
of them are entered into the Topology table thereby giving a number of next hop choices
for the local router should the neighbor with the lowest metric fail. What you should note
here, is that the metric for a neighbor to reach a particular network (i.e. the Reported
Distance) must always be less than the metric (Feasible Distance) for the local router to
reach that same network. This way routing loops are avoided. This is why routes that
have Reported Distances larger than the Feasible Distance are not entered into the
Topology table, so that they can never be considered as successors, since the route is
likely to loop back through that local router.
Incorrect Answers:
D: The feasible successors are found in the topology table, but not the active routing
table.
E: With EIGRP, traffic is load balanced across equal cost links in the routing table, but
not between feasible successors.
Reference: http://www.rhyshaden.com/eigrp.htm
QUESTION 3:
Two Certkiller EIGRP routers are attempting to establish themselves as neighbors.
Which EIGRP multicast packet type is responsible for neighbor discovery?
642-901
Actualtests.com – The Power of Knowing
A. Update
B. Query
C. Acknowledgment
D. Reply
E. Hello
F. None of the above
Answer: E
Explanation:
Remember that simple distance vector routers do not establish any relationship with their
neighbors. RIP and IGRP routers merely broadcast or multicast updates on configured
interfaces. In contrast, EIGRP routers actively establish relationships with their
neighbors, much the same way that OSPF routers do.
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable
QUESTION 4:
Certkiller has chosen to use EIGRP for their network routing protocol. Which three
statements are true regarding EIGRP? (Select three)
A. By default, EIGRP uses the Dijkstra algorithm to determine the best path to a
destination network based on bandwidth and delay.
B. To speed convergence, EIGRP attempts to maintain a successor and feasible successor
path for each destination.
C. EIGRP uses hellos to establish neighbor relationships.
D. By default, EIGRP performs auto-summarization across classful network boundaries.
E. EIGRP uses an area hierarchy to increase network scalability.
Answer: B, C, D
Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable
642-901
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EIGRP routers keep route and topology information readily available in RAM so they
can react quickly to changes. Like OSPF, EIGRP keeps this information in several tables,
or databases.
* Successor – A successor is a route selected as the primary route to use to reach a
destination. Successors are the entries kept in the routing table. Multiple successors for a
destination can be retained in the routing table.
* Feasible successor – A feasible successor is a backup route. These routes are selected
at the same time the successors are identified, but are kept in the topology table. Multiple
feasible successors for a destination can be retained in the topology table.
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary
QUESTION 5:
You need to configure EIGRP on all routers within the Certkiller network. Which
two statements are characteristics of the routing protocol EIGRP? (Select two)
A. Updates are sent as broadcast.
B. Updates are sent as multicast.
C. LSAs are sent to adjacent neighbors.
D. Metric values are represented in a 32-bit format for granularity.
Answer: B, D
Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
642-901
Actualtests.com – The Power of Knowing
3. Rediscover routers that had previously been unreachable
QUESTION 6:
You have been tasked with setting up summarization in the Certkiller EIGRP
network. Which two statements are true about EIGRP manual summarization?
(Select two)
A. Manual summarization is configured on a per interface basis.
B. When manual summarization is configured, auto-summarization is automatically
disabled by default.
C. The summary address is assigned an administrative distance of 10 by default.
D. Manual summaries can be configured with the classful mask only.
E. The summary address is entered into the routing table and is shown to be sourced from
the Null0 interface.
Answer: A, E
Explanation:
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary
EIGRP also enables manual configuration of a prefix to use as a summary address.
Manual summary routes are configured on a per-interface basis. The interface that will
propagate the route summary must first be selected and then defined with the ip
summary-address eigrp command, which has the following syntax:
642-901
Actualtests.com – The Power of Knowing
Router(config-if)#ip summary-address eigrp autonomous-system-number
ip-address mask administrative-distance
D 2.1.0.0/16 is a summary, 00:00:22, Null0
Notice that the summary route is sourced from Null0, and not an actual interface.
QUESTION 7:
Router CK1 4 is configured as an EIGRP stub router. What are three key concepts
that apply when configuring the EIGRP stub routing feature in a hub and spoke
network? (Select three)
A. Stub routers are not queried for routes.
B. A hub router prevents routes from being advertised to the remote router.
C. A stub router should have only EIGRP hub routers as neighbors.
D. EIGRP stub routing should be used on hub routers only.
E. Spoke routers connected to hub routers answer the route queries for the stub router.
F. Only remote routers are configured as stubs.
Answer: A, C, F
Explanation:
The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature
improves network stability, reduces resource utilization, and simplifies stub router
configuration.
Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke
network, one or more end (stub) networks are connected to a remote router (the spoke)
that is connected to one or more distribution routers (the hub). The remote router is
adjacent only to one or more distribution routers. The only route for IP traffic to follow
into the remote router is through a distribution router. This type of configuration is
commonly used in WAN topologies where the distribution router is directly connected to
a WAN. The distribution router can be connected to many more remote routers. Often,
the distribution router will be connected to 100 or more remote routers. In a hub and
spoke topology, the remote router must forward all nonlocal traffic to a distribution
router, so it becomes unnecessary for the remote router to hold a complete routing table.
Generally, the distribution router need not send anything more than a default route to the
remote router.
When using the EIGRP Stub Routing feature, you need to configure the distribution and
remote routers to use EIGRP, and to configure only the remote router as a stub. Only
specified routes are propagated from the remote (stub) router. The router responds to
queries for summaries, connected routes, redistributed static routes, external routes, and
internal routes with the message “inaccessible.” A router that is configured as a stub will
send a special peer information packet to all neighboring routers to report its status as a
stub router.
More on:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s15/eigrpstb.
642-901
Actualtests.com – The Power of Knowing
QUESTION 8:
You want to reduce the amount of EIGRP traffic across low speed links in the
Certkiller network. Which is the most effective technique to contain EIGRP queries?
A. Using a hierarchical addressing scheme
B. Configuring route filters
C. Establishing separate autonomous systems
D. Route summarization
E. None of the above
Answer: D
Explanation:
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary
EIGRP also enables manual configuration of a prefix to use as a summary address.
Manual summary routes are configured on a per-interface basis. The interface that will
propagate the route summary must first be selected and then defined with the ip
summary-address eigrp command, which has the following syntax:
Router(config-if)#ip summary-address eigrp autonomous-system-number
ip-address mask administrative-distance
QUESTION 9:
Routers CK1 and CK2 have formed an EIGRP neighbor relationship. In order for
two routers to become EIGRP neighbors, which two values must match? (Select
two)
A. K values
B. Delay
C. Autonomous system
D. Hello time
E. Hold time
F. Bandwidth
Answer: A, C
Explanation:
Despite being compatible with IGRP, EIGRP uses a different metric calculation and hop-count
limitation. EIGRP scales the IGRP metric by a factor of 256. That is because EIGRP uses a
642-901
Actualtests.com – The Power of Knowing
metric that is 32-bits long, and IGRP uses a 24-bit metric. By multiplying or dividing by 256,
EIGRP can easily exchange information with IGRP.
EIGRP also imposes a maximum hop limit of 224, which is slightly less than the 255 limit for
IGRP. However, this is more than enough to support most of the largest internetworks. To
become the neighbor K value should be matched and should belongs to same AS.
QUESTION 10:
Certkiller uses EIGRP as their internal routing protocol. Which three statements are
true about EIGRP operation? (Select three)
A. The maximum metric for the specific routes is used as the metric for the summary
route.
B. When summarization is configured, the router will also create a route to null 0.
C. The summary route remains in the route table, even if there are no more specific
routes to the network.
D. Automatic summarization across major network boundaries is enabled by default.
E. Summarization is configured on a per-interface level.
Answer: B, D, E

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1. Which command should you issue first to configure EIGRP for IP?

A. ip eigrp routing

B. router eigrp process-id

C. ip eigrp autonomous-system-number

D. router eigrp autonomous-system-number

Answer: D

2. Which two statements about 6to4 tunneling are accurate? (Choose two.)

A. Prepending a reserved IPv6 code to the hexadecimal representation of 192.168.0.1 facilitates 6to4 tunneling.

B. Each 6to4 site receives a /48 prefix in a 6to4 tunnel.

C. 2002::/48 is the address range specifically assigned to 6to4.

D. Prepending 0×2002 with the IPv4 address creates an IPv6 address that is used in 6to4 tunneling.

E. 6to4 is a manual tunnel method. Answer: BD

3. Which statement is true about the implementation of IPv6 in an already existing IPv4 network? A. IPv6 can be routed using the same routing protocol versions as IPv4
B. A router routing for IPv6 and IPv4 must convert IPv4 packets to IPv6 packets to route them. C. IPv4 and IPv6 networks can be routed simultaneously.
D. Only OSPF version 3 can be utilized for routing IPv4 and IPv6. Answer: C

4. Refer to the exhibit. Will redistributed RIP routes from OSPF Area 2 be allowed in Area 1?

A. Because Area 1 is an NSSA, redistributed RIP routes will not be allowed.

B. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 5 LSAs in Area 0

and passed on into Area 1.

C. Because NSSA will discard type 7 LSAs, redistributed RIP routes will not be allowed in Area 1.

D. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 7 LSAs in Area 0

and passed on into Area 1.

E. RIP routes will be allowed in Area 1 only if they are first redistributed into EIGRP. Answer: A

5. Refer to the exhibit. Router RTR is attempting to establish BGP neighbor relationships with routers RT1 and

RT3. On the basis of the information that is presented in the exhibit, which two statements are true? (Choose two.)

A. RTR has a BGP password set but neighbor 10.0.0.1 does not. B. RTR has a BGP password set but neighbor 10.0.0.5 does not.
C. RTR has a BGP password set but neighbor 10.0.0.1 has an incorrect password set. D. RTR has a BGP password set but neighbor 10.0.0.5 has an incorrect password set.
E. Neighbor 10.0.0.1 has a BGP password set but RTR does not. F. Neighbor 10.0.0.5 has a BGP password set but RTR does not. Answer: AD

6. Refer to the exhibit. The DHCP configuration that is shown is configured on a Cisco router. Which statement is

true?

A. The router will distribute IP addresses from pool 1 until its addresses are exhausted. Then the router will begin distributing addresses from pool 2.
B. The router will choose which pool to use based upon the interface the DHCP request was received on.

C. The configuration is invalid because the DHCP options are global configuration commands.

D. The configuration is incomplete until the DHCP pools are bound to the appropriate interface or interfaces. Answer: B

7. How is the designated querier elected in IGMPv2? A. The first router to appear on a subnet is designated.
B. The host that responds first to the election query is designated. C. The router with the lowest IP address on a subnet is designated.
D. The host with the lowest MAC address on a segment is designated. Answer: C

8. A router is running BGP and receives more than one route for a particular prefix. Assume all the routes for this prefix have the same attributes. Which three path features would be reasons be for the router to ignore some of the routes and not consider them as candidates for the best path? (Choose three.)
A. paths that are marked as synchronized in the show ip bgp output

B. paths that are marked as not synchronized in the show ip bgp output

C. paths for which the NEXT_HOP is accessible

D. paths for which the NEXT_HOP is inaccessible

E. paths from an external BGP (eBGP) neighbor if the local autonomous system (AS) appears in the AS_PATH

F. paths from an internal BGP (iBGP) neighbor if the local autonomous system (AS) appears in the AS_PATH Answer: BDE

9. Refer to the exhibit. OSPF has been configured on all routers in the network and Area 1 has been configured as

a NSSA. Which statement is true about the NSSA Area 1?

A. Redistributed RIP and IGRP routes will appear in Area 1. They will be advertised via type 5 LSAs.

B. Only redistributed RIP routes will appear in Area 1. They will be advertised via type 7 LSAs.

C. Only redistributed IGRP routes will appear in Area 1. They will be advertised via type 7 LSAs. D. No redistributed routes can appear in Area 1, only summary routes.
Answer: C

10. Refer to the exhibit. Switch Cat2 is receiving IGMP frames only on interface FastEthernet 0/3. Given IGMP

snooping, out of which port or ports will switch Cat2 forward multicast traffic?

A. all ports

B. none of the ports

C. FastEthernet 0/3

D. FastEthernet 0/1, 0/2, 0/4

E. FastEthernet 0/1, 0/2, 0/3, 0/4

F. FastEthernet 0/1, 0/2, 0/4, 0/5, 0/6, 0/7, 0/8

Answer: C

11. An administrator types in the command router ospf 1 and receives the error message: “OSPF process 1 cannot start.” (Output is omitted.) What should be done to correctly set up OSPF?
A. Ensure that an interface has been configured with an IP address.

B. Ensure that an interface has been configured with an IP address and is up. C. Ensure that IP classless is enabled.
D. Ensure that the interfaces can ping their directly connected neighbors. Answer: B

12. Refer to the exhibit. On the basis of the partial configuration, which two statements are correct? (Choose two.)

A. Only routes matching 10.0.1.0/24 will be advertised out Ethernet 0. B. Only routes 10.0.1.0/24 will be sent out all interfaces.
C. Only routes 10.0.1.0/24 will be allowed in the routing table.

D. Only routes matching 10.0.0.0/8 will be advertised out Ethernet 0.

E. Only routes matching 10.0.0.0/8 will be advertised out interfaces other than Ethernet 0.

F. All routes will be advertised out interfaces other than Ethernet 0. Answer: AE

13. Which three statements about the EIGRP routing protocol are true? (Choose three.) A. EIGRP sends periodic hello packets to the multicast IP address 224.0.0.9.
B. EIGRP sends periodic hello packets to the multicast IP address 224.0.0.10.

C. EIGRP supports five generic packet types, including hello, update, query, reply, and ACK packets.

D. EIGRP supports five generic packet types, including hello, database description (DBD), link-state request

(LSR), link-state update (LSU), and LSAck.

E. EIGRP will form a neighbor relationship with another peer even when their K values are mismatched.

F. EIGRP will not form a neighbor relationship with another peer when their K values are mismatched. Answer: BCF

14. Refer to the exhibit. A network administrator has configured DHCP services on the router as shown. DHCP clients connected to the FastEthernet0/0 interface are working properly. DHCP clients connected to the FastEthernet0/1 interface are not receiving addresses. Which two statements contain recommendations that will solve the problem? (Choose two.)

A. The ip helper-address 10.0.0.1 command should be issued so that the address can be added to the

FastEthernet0/0 configuration.

B. The ip helper-address 10.0.0.1 command should be issued so that the address can be added to the

FastEthernet0/1 configuration.

C. A second DHCP pool for network 10.10.0.0/24 should be configured.

D. The network shown in the output under the ip dhcp pool Central command should be changed to network

10.10.0.0 with a mask of 255.255.255.0.

E. An ip dhcp excluded-address global configuration command for network 10.10.0.0/24 should be issued. Answer: CE

15. Which two statements are true about the rendezvous point (RP) in a multicast network? (Choose two.)

A. An RP is required only in networks running Protocol Independent Multicast dense mode (PIM DM).

B. An RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM).

C. An RP is required only in networks running Protocol Independent Multicast sparse-dense mode (PIM-SDM).

D. The multicast sources must register with the RP to form the multicast distribution tree.

E. The multicast receivers must register with the RP to form the multicast distribution tree.

F. To form the multicast distribution tree, the multicast sources register with and the receivers join the RP. Answer: BF

16. Refer to the exhibit. Given the output of a debug ip mrouting command, which two statements are true?

(Choose two.)

A. This router received an IGMP host report from a group member or a PIM join message.

B. The reverse path forwarding (RPF) for the route 224.2.0.1 failed to find the interface on which the multicast packet was received.
C. Multicast route to 10.16.0.0/16 was added to the mroute table and created by a source directly connected to the router.
D. Multicast route to 224.69.15.0/24 was added to the mroute table and created by a source directly connected to the router.
E. The route to 224.69.15.0/24 will be out Ethernet 0. Answer: AC

17. Refer to the exhibit. On the basis of the information presented, which statement is true?

A. A default route is configured on the local router.

B. Network 6.0.0.0/8 was learned from an OSPF neighbor within the area. C. OSPF router 5.0.0.2 is an ABR.
D. The default route is learned from an OSPF neighbor. Answer: B

18. Based on the topology shown in the network diagram, what optional EIGRP configurations will be required in order to achieve full connectivity within AS 100?

A. Use the EIGRP no auto-summary command on R1 and R2.

B. Use the EIGRP no auto-summary command on R3 and R4.

C. Use the passive interface on the R1 and R2 interface that connects to the 10.1.1.0/24 and 10.1.2.0/24 subnet respectively.
D. Use the passive interface command between the R3 and R1 connection and between the R3 and R2 connection.

E. Use the variance command on R3. Answer: A

19. How is authentication handled with OSPFv3?

A. OSPFv3 for IPv6 authentication is supported by SHA-1 authentication. B. OSPFv3 for IPv6 authentication is supported by MD5 authentication.
C. OSPFv3 for IPv6 authentication is supported by IPv6 IPsec. D. OSPFv3 for IPv6 authentication is supported by IPv4 IPsec. Answer: C

20. Which three IP multicast group concepts are true? (Choose three.)

A. If a packet is sent to a multicast group address, all members of the multicast group will receive it.

B. If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.

C. A router does not have to be a member of a multicast group to receive multicast data. D. A router does not have to be a member of a multicast group to send to the group.
E. A router must be a member of a multicast group to receive multicast data.

F. A router must be a member of a multicast group to send to the group. Answer: ADE

21. Which three IP multicast address related statements are true? (Choose three.)

A. Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted with

Time to Live (TTL) greater than 1.

B. Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers.

C. Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link-local addresses used by PIMv2 and IGMPv3.

D. Because they would map to overlapping IP multicast MAC addresses, multicast addresses 224.0.1.1 and

238.1.1.1 could not be used together.

E. Multicast address 224.0.1.1 has been reserved for the Network Time Protocol (NTP) by the IANA.

F. The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in purpose to

RFC 1918 private unicast addresses. Answer: CEF

22. Which command will display EIGRP packets sent and received, as well as statistics on hello packets, updates, queries, replies, and acknowledgments?
A. debug eigrp packets B. show ip eigrp traffic C. debug ip eigrp
D. show ip eigrp interfaces

Answer: B

23. What is the IPv6 address FF02::2 used for? A. all hosts in a local segment
B. all routers in a local segment

C. all hosts in a particular multicast group D. all routers in an autonomous system Answer: B

24. Which three characteristics apply to IS-IS but not to OSPF? (Choose three.) A. encapsulates PDUs directly into a data-link frame
B. uses a DIS and a backup DIS to present the psuedo-node on the LAN C. uses stubby areas to improve network scalability
D. uses a default IOS metric of 10 on each interface

E. runs PRC (Partial Route Calculations) to calculate IP reachability information

F. uses an on-demand circuit to reduce the hello and LSA flooding across switched WAN links, such as ISDN Answer: ADE

25. If no metric is specified for the routes being redistributed into IS-IS, what metric value is assigned to the

routes? A. 0
B. 1

C. 10

D. 20

Answer: A

26. Which two reductions are the correct reductions of the IPv6 address

2001:0d02:0000:0000:0014:0000:0000:0095? (Choose two.) A. 2001:d02::14::95
B. 2001:0d02:::0014:::0095

C. 2001:0d02:::0014:0:0:0095

D. 2001:d02::14:0:0:95

E. 2001:d02:0:0:14::95

F. FF::0014:0:0:0095

Answer: DE

27. Refer to the exhibit. What will RTB do with a packet sourced from within AS 64200 with a destination address

of 192.168.25.1?

A. It will be dropped because network 192.168.25.0 is not in the RTA routing table.

B. It will be dropped because network 192.168.25.0 is not in the RTB routing table.

C. It will be forwarded to the null 0 interface of RTB and dropped. D. It will be forwarded to the RTB 192.168.25.0 network.
Answer: D

28. Which three statements are correct about the differences in IS-IS and OSPF? (Choose three.) A. IS-IS LSP contains TLV fields and OSPF LSU contains the LSAs.
B. New additions to the protocol are easily implemented in OSPF but not with IS-IS. C. For greater fine tuning there are more IS-IS timers.
D. OSPF has more area types than does IS-IS. E. IS-IS is more CPU-intensive than is OSPF. Answer: ACD

29. What happens when an IPv6 enabled router running 6to4 must send a packet to a remote destination and the next hop is the address of 2002::/16?
A. The packet is tagged with an IPv6 header and the IPv6 prefix is included.

B. The IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41. C. The IPv6 packet has its header removed and replaced with an IPv4 header.
D. The IPv6 packet is dropped because that destination is unable to route IPv6 packets. Answer: B

30. Refer to the exhibit. What is the effect of the distribute-list command in the R1 configuration?

A. R1 will filter only the 172.24.1.0/24 route from the R2 RIP updates.

B. R1 will permit only the 10.0.0.0/24 route in the R2 RIP updates.

C. R1 will filter the 10.1.0.0/24 and the 172.24.1.0/24 routes from the R2 RIP updates. D. R1 will not filter any routes because there is no exact prefix match.
Answer: C

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Exam Number: 642-901
Associated Certifications: CCNP, CCIP, CCDP
Duration: 90 minutes
Available Languages: English
Click Here to Register: Pearson VUE
Exam Policies: Read current policies and requirements
Exam Tutorial: Review type of exam questions
QUESTION 1
Certkiller uses EIGRP as the primary routing protocol in their network. How does
EIGRP advertise subnet masks for each destination network?

A. EIGRP advertises a fixed length subnet mask for each destination network.
B. EIGRP advertises only a classful subnet mask for each destination network.
C. EIGRP, like IGRP and RIP, does not advertise a subnet mask for each destination network.
D. EIGRP advertises a prefix length for each destination network. E. None of the above
Answer: D Explanation:
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary routing protocol based on IGRP. Unlike IGRP, which is a classful routing protocol, EIGRP supports CIDR, allowing network designers to maximize address space by using CIDR and VLSM. Compared to IGRP, EIGRP boasts faster convergence times, improved scalability, and superior handling of routing loops.
The prefix length field signifies the subnet mask to be associated with the network number specified in the destination field. Thus, if an EIGRP router is configured as follows:
1. ip address 172.16.1.1 255.255.255.0
it will advertise 172.16.1.0 with a prefix length of 24. Likewise, if the router is configured as follows:
1. ip address 172.16.250.1 255.255.255.252
it will advertise 172.16.250.0 with a prefix length of 30.

QUESTION 2
The Certkiller network uses EIGRP. Identify three characteristics of EIGRP feasible successors? (Select three)

A. Traffic will be load balanced between feasible successors with the same advertised distance.
B. If the advertised distance of the non-successor route is less than the feasible distance
of best route, then that route is identified as a feasible successor.
C. If the successor becomes unavailable, then the feasible successor can be used immediately without recalculating for a lost route.
D. The feasible successor can be found in the routing table.
E. A feasible successor is selected by comparing the advertised distance of a non-successor route to the feasible distance of the best route.

Answer: B, C, E Explanation:

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642-901

Once a neighbor relationship has been formed, called an Adjacency, the routers exchange
routing update information and each router builds its own topology table. The Updates contain all the routes known by the sender. For each route, the receiving router calculates
a distance for that route based on the distance that is conveyed and the cost to that
neighbor that advertised the particular route. If the receiving router sees several routes to
a particular network with different metrics, then the route with the lowest metric becomes the Feasible Distance (FD) to that network. The Feasible Distance is the metric of a
network advertised by the connected neighbor plus the cost of reaching that neighbor.
This path with the best metric is entered into the routing table because this is the quickest way to get to that network.
With the other possible routes to a particular network with larger metrics, the receiving router also receives the Reported Distance (RD) to this network via other routers. The Reported Distance being the total metric along a path to a destination network as advertised by an upstream neighbor. The Reported Distance for a particular route is compared with the Feasible Distance that it already has for that route. If the Reported Distance is larger than the Feasible Distance then this route is not entered into the Topology Table as a Feasible Successor. This prevents loops from occurring. If the
Reported Distance is smaller than the Feasible Distance, then this path is considered to be
a Feasible Successor and is entered into the Topology table. The Successor for a particular route is the neighbor/peer with the lowest metric/distance to that network.
If the receiving router has a Feasible Distance to a particular network and it receives an update from a neighbor with a lower advertised distance (Reported Distance) to that network, then there is a Feasibility Condition. In this instance, the neighbor becomes a Feasible Successor for that route because it is one hop closer to the destination network. There may be a number of Feasible Successors in a meshed network environment, up to 6
of them are entered into the Topology table thereby giving a number of next hop choices for the local router should the neighbor with the lowest metric fail. What you should note
here, is that the metric for a neighbor to reach a particular network (i.e. the Reported Distance) must always be less than the metric (Feasible Distance) for the local router to reach that same network. This way routing loops are avoided. This is why routes that
have Reported Distances larger than the Feasible Distance are not entered into the Topology table, so that they can never be considered as successors, since the route is likely to loop back through that local router.
Incorrect Answers:
D: The feasible successors are found in the topology table, but not the active routing table.
E: With EIGRP, traffic is load balanced across equal cost links in the routing table, but not between feasible successors.
Reference: http://www.rhyshaden.com/eigrp.htm

QUESTION 3
Two Certkiller EIGRP routers are attempting to establish themselves as neighbors. Which EIGRP multicast packet type is responsible for neighbor discovery?

A. Update
B. Query

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642-901

C. Acknowledgment
D. Reply
E. Hello
F. None of the above
Answer: E Explanation:
Remember that simple distance vector routers do not establish any relationship with their neighbors. RIP and IGRP routers merely broadcast or multicast updates on configured interfaces. In contrast, EIGRP routers actively establish relationships with their
neighbors, much the same way that OSPF routers do.
EIGRP routers establish adjacencies with neighbor routers by using small hello packets. Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable

QUESTION 4
Certkiller has chosen to use EIGRP for their network routing protocol. Which three statements are true regarding EIGRP? (Select three)

A. By default, EIGRP uses the Dijkstra algorithm to determine the best path to a destination network based on bandwidth and delay.
B. To speed convergence, EIGRP attempts to maintain a successor and feasible successor path for each destination.
C. EIGRP uses hellos to establish neighbor relationships.
D. By default, EIGRP performs auto-summarization across classful network boundaries.
E. EIGRP uses an area hierarchy to increase network scalability. Answer: B, C, D
Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets. Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable
EIGRP routers keep route and topology information readily available in RAM so they
can react quickly to changes. Like OSPF, EIGRP keeps this information in several tables,
or databases.
* Successor – A successor is a route selected as the primary route to use to reach a

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642-901

destination. Successors are the entries kept in the routing table. Multiple successors for a
destination can be retained in the routing table.
* Feasible successor – A feasible successor is a backup route. These routes are selected
at the same time the successors are identified, but are kept in the topology table. Multiple feasible successors for a destination can be retained in the topology table.
EIGRP automatically summarizes routes at the classful boundary, the boundary where the network address ends as defined by class-based addressing. In most cases, auto summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary

QUESTION 5
You need to configure EIGRP on all routers within the Certkiller network. Which two statements are characteristics of the routing protocol EIGRP? (Select two)

A. Updates are sent as broadcast. B. Updates are sent as multicast.
C. LSAs are sent to adjacent neighbors.
D. Metric values are represented in a 32-bit format for granularity. Answer: B, D
Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets. Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
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Exam Number: 640-802 CCNA
Associated Certifications: CCNA
Duration: 90 Minutes (50-60 questions)
Available Languages: English
Click Here to Register: Pearson VUE
Exam Policies: Read current policies and requirements
Exam Tutorial: Review type of exam questions
Question: 1
What are two reasons that a network administrator would use access lists? (Choose two.)

A. to control vty access into a router
B. to control broadcast traffic through a router C. to filter traffic as it passes through a router D. to filter traffic that originates from the router
E. to replace passwords as a line of defense against security incursions
Answer: A, C Question: 2
A default Frame Relay WAN is classified as what type of physical network?

A. point-to-point
B. broadcast multi-access
C. nonbroadcast multi-access
D. nonbroadcast multipoint
E. broadcast point-to-multipoint
Answer: C Question: 3
A single 802.11g access point has been configured and installed in the center of a square office.
A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem? (Choose three.)

A. mismatched TKIP encryption
B. null SSID
C. cordless phones D. mismatched SSID E. metal file cabinets
F. antenna type or direction
Answer: C, E, F Question: 4
Refer to the exhibit.

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Exam Name: Cisco Certified Network Associate
Exam Type: Cisco Case Studies: 1
Exam Code: 640-802 Total Questions: 194

How many broadcast domains exist in the exhibited topology?

A. one B. two C. three D. four E. five F. six
Answer: C Question: 5
Refer to the exhibit.

What two facts can be determined from the WLAN diagram? (Choose two.) A. The area of overlap of the two cells represents a basic service set (BSS).
B. The network diagram represents an extended service set (ESS). C. Access points in each cell must be configured to use channel 1.
D. The area of overlap must be less than 10% of the area to ensure connectivity. E. The two APs should be configured to operate on different channels.
Answer: B, E Question: 6
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which
of the following statements is true concerning this command?

A. This command should be executed from the global configuration mode. B. The IP address 10.121.16.8 is the local router port used to forward data.
C. 102 is the remote DLCI that will receive the information.
D. This command is required for all Frame Relay configurations.
E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

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Exam Name: Cisco Certified Network Associate
Exam Type: Cisco Case Studies: 1
Exam Code: 640-802 Total Questions: 194

Answer: E

Question: 7
Which type of attack is characterized by a flood of packets that are requesting a TCP connection
to a server?

A. denial of service
B. brute force
C. reconnaissance
D. Trojan horse
Answer: A Question: 8
Which of the following are associated with the application layer of the OSI model? (Choose two.)

A. ping
B. Telnet C. FTP D. TCP E. IP
Answer: B, C Question: 9
Refer to the exhibit.

The network administrator has created a new VLAN on Switch1 and added host C and host D. The administrator has properly configured switch interfaces FastEthernet0/13 through FastEthernet0/24 to be members of the new VLAN. However, after the network administrator completed the configuration, host A could communicate with host B, but host A could not communicate with host C or host D. Which commands are required to resolve this problem?

A. Router(config)# interface fastethernet 0/1.3

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Exam Name: Cisco Certified Network Associate
Exam Type: Cisco Case Studies: 1
Exam Code: 640-802 Total Questions: 194

Router(config-if)# encapsulation dot1q 3
Router(config-if)# ip address 192.168.3.1 255.255.255.0
B. Router(config)# router rip
Router(config-router)# network 192.168.1.0
Router(config-router)# network 192.168.2.0
Router(config-router)# network 192.168.3.0
C. Switch1# vlan database Switch1(vlan)# vtp v2-mode Switch1(vlan)# vtp domain cisco Switch1(vlan)# vtp server
D. Switch1(config)# interface fastethernet 0/1
Switch1(config-if)# switchport mode trunk
Switch1(config-if)# switchport trunk encapsulation isl
Answer: A Question: 10
For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access
control lists?

A. IP
B. ICMP C. TCP D. UDP
Answer: B Question: 11
What are two recommended ways of protecting network device configuration files from outside
network security threats? (Choose two.)

A. Allow unrestricted access to the console or VTY ports.
B. Use a firewall to restrict access from the outside to the network devices.
C. Always use Telnet to access the device command line because its data is automatically encrypted.
D. Use SSH or another encrypted and authenticated transport to access device configurations.
E. Prevent the loss of passwords by disabling password encryption.
Answer: B, D Question: 12
Refer to the exhibit.

Exam 640-802: Cisco CertifieNetwork Associate Exam (CCNA)

Number of questions: 50-60

Duration: 1 hour

Cost: $150

Exam Topics Include:

1. Describe how a network works

2. Configure, verify and troubleshoot a switch with VLANs and interswitch communications

3. Implement an IP addressing scheme and IP Services to meet network requirements in a medium-size Enterprise branch office network.

4. Configure, verify, and troubleshoot basic router operation and routing.

5. Explain and select the appropriate administrative tasks required for a WLAN

6. Identify security threats to a network and describe methods to mitigate those threats

7. Implement, verify, and troubleshoot Network Address Translation (NAT) and Access Control Lists (ACLs).

8. Implement and verify WAN links, including frame relay and PPP

The Cisco CCNA certification (Cisco Certified Network Associates) is an introductory level exam for those relatively new to Cisco networking. The CCNA exam by Cisco systems was designed for the candidates who can install, configure and administer small to medium sized LANs and WANs. The CCNA is a prerequisite for the some higher level certifications like the CCNP. The CCNA exam is valid for three years. Job roles for the individuals who are CCNA certified include network administrators, system managers, and network consultants.

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QUESTION 3
Two Certkiller EIGRP routers are attempting to establish themselves as neighbors.
Which EIGRP multicast packet type is responsible for neighbor discovery?

A. Update
B. Query

C. Acknowledgment
D. Reply
E. Hello
F. None of the above

Answer: E

Explanation:
Remember that simple distance vector routers do not establish any relationship with their
neighbors. RIP and IGRP routers merely broadcast or multicast updates on configured
interfaces. In contrast, EIGRP routers actively establish relationships with their
neighbors, much the same way that OSPF routers do.
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable

QUESTION 4
Certkiller has chosen to use EIGRP for their network routing protocol. Which three
statements are true regarding EIGRP? (Select three)

A. By default, EIGRP uses the Dijkstra algorithm to determine the best path to a
destination network based on bandwidth and delay.
B. To speed convergence, EIGRP attempts to maintain a successor and feasible successor
path for each destination.
C. EIGRP uses hellos to establish neighbor relationships.
D. By default, EIGRP performs auto-summarization across classful network boundaries.
E. EIGRP uses an area hierarchy to increase network scalability.

Answer: B, C, D

Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable
EIGRP routers keep route and topology information readily available in RAM so they
can react quickly to changes. Like OSPF, EIGRP keeps this information in several tables,
or databases.
* Successor – A successor is a route selected as the primary route to use to reach a
destination. Successors are the entries kept in the routing table. Multiple successors for a
destination can be retained in the routing table.
* Feasible successor – A feasible successor is a backup route. These routes are selected
at the same time the successors are identified, but are kept in the topology table. Multiple
feasible successors for a destination can be retained in the topology table.
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary

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Exam Number/Code: 642-901
Exam Name: BSCI – Building Scaleable Cisco Internetworks
VUE Code: 642-901
Questions Type: Multiple choice,

Exam : CISCO 642­-901

Title :

Building Scalable Cisco

Internetworks

Update : Demo

1. Which command should you issue first to configure EIGRP for IP?

A. ip eigrp routing

B. router eigrp process­id

C. ip eigrp autonomous­system­number

D. router eigrp autonomous­system­number

Answer: D

2. Which two statements about 6to4 tunneling are accurate? (Choose two.)

A. Prepending a reserved IPv6 code to the hexadecimal representation of 192.168.0.1 facilitates 6to4

tunneling.

B. Each 6to4 site receives a /48 prefix in a 6to4 tunnel.

C. 2002::/48 is the address range specifically assigned to 6to4.

D. Prepending 0×2002 with the IPv4 address creates an IPv6 address that is used in 6to4 tunneling.

E. 6to4 is a manual tunnel method. Answer: BD

3. Which statement is true about the implementation of IPv6 in an already existing IPv4 network?

A. IPv6 can be routed using the same routing protocol versions as IPv4

B. A router routing for IPv6 and IPv4 must convert IPv4 packets to IPv6 packets to route them.

C. IPv4 and IPv6 networks can be routed simultaneously.

D. Only OSPF version 3 can be utilized for routing IPv4 and IPv6. Answer: C

4. Refer to the exhibit. Will redistributed RIP routes from OSPF Area 2 be allowed in Area 1?

A. Because Area 1 is an NSSA, redistributed RIP routes will not be allowed.

B. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 5 LSAs in

Area 0 and passed on into Area 1.

C. Because NSSA will discard type 7 LSAs, redistributed RIP routes will not be allowed in Area 1.

D. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 7 LSAs in

Area 0 and passed on into Area 1.

E. RIP routes will be allowed in Area 1 only if they are first redistributed into EIGRP. Answer: A

5. Refer to the exhibit. Router RTR is attempting to establish BGP neighbor relationships with routers RT1

and RT3. On the basis of the information that is presented in the exhibit, which two statements are true?

(Choose two.)

A. RTR has a BGP password set but neighbor 10.0.0.1 does not.

B. RTR has a BGP password set but neighbor 10.0.0.5 does not.

C. RTR has a BGP password set but neighbor 10.0.0.1 has an incorrect password set.

D. RTR has a BGP password set but neighbor 10.0.0.5 has an incorrect password set. E. Neighbor 10.0.0.1 has a BGP password set but RTR does not.
F. Neighbor 10.0.0.5 has a BGP password set but RTR does not. Answer: AD

6. Refer to the exhibit. The DHCP configuration that is shown is configured on a Cisco router. Which statement is true?

A. The router will distribute IP addresses from pool 1 until its addresses are exhausted. Then the router

will begin distributing addresses from pool 2.

B. The router will choose which pool to use based upon the interface the DHCP request was received on.

C. The configuration is invalid because the DHCP options are global configuration commands.

D. The configuration is incomplete until the DHCP pools are bound to the appropriate interface or interfaces.
Answer: B

7. How is the designated querier elected in IGMPv2?

A. The first router to appear on a subnet is designated.

B. The host that responds first to the election query is designated.

C. The router with the lowest IP address on a subnet is designated.

D. The host with the lowest MAC address on a segment is designated. Answer: C

8. A router is running BGP and receives more than one route for a particular prefix. Assume all the routes

for this prefix have the same attributes. Which three path features would be reasons be for the router to ignore some of the routes and not consider them as candidates for the best path? (Choose three.)
A. paths that are marked as synchronized in the show ip bgp output

B. paths that are marked as not synchronized in the show ip bgp output

C. paths for which the NEXT_HOP is accessible

D. paths for which the NEXT_HOP is inaccessible

E. paths from an external BGP (eBGP) neighbor if the local autonomous system (AS) appears in the

AS_PATH

F. paths from an internal BGP (iBGP) neighbor if the local autonomous system (AS) appears in the

AS_PATH Answer: BDE

9. Refer to the exhibit. OSPF has been configured on all routers in the network and Area 1 has been configured as a NSSA. Which statement is true about the NSSA Area 1?

A. Redistributed RIP and IGRP routes will appear in Area 1. They will be advertised via type 5 LSAs.

B. Only redistributed RIP routes will appear in Area 1. They will be advertised via type 7 LSAs.

C. Only redistributed IGRP routes will appear in Area 1. They will be advertised via type 7 LSAs.

D. No redistributed routes can appear in Area 1, only summary routes. Answer: C

10. Refer to the exhibit. Switch Cat2 is receiving IGMP frames only on interface FastEthernet 0/3. Given

IGMP snooping, out of which port or ports will switch Cat2 forward multicast traffic?

A. all ports

B. none of the ports

C. FastEthernet 0/3

D. FastEthernet 0/1, 0/2, 0/4

E. FastEthernet 0/1, 0/2, 0/3, 0/4

F. FastEthernet 0/1, 0/2, 0/4, 0/5, 0/6, 0/7, 0/8

Answer: C

11. An administrator types in the command router ospf 1 and receives the error message: “OSPF process

1 cannot start.” (Output is omitted.) What should be done to correctly set up OSPF? A. Ensure that an interface has been configured with an IP address.
B. Ensure that an interface has been configured with an IP address and is up. C. Ensure that IP classless is enabled.
D. Ensure that the interfaces can ping their directly connected neighbors. Answer: B

12. Refer to the exhibit. On the basis of the partial configuration, which two statements are correct?

(Choose two.)

A. Only routes matching 10.0.1.0/24 will be advertised out Ethernet 0.

B. Only routes 10.0.1.0/24 will be sent out all interfaces.

C. Only routes 10.0.1.0/24 will be allowed in the routing table.

D. Only routes matching 10.0.0.0/8 will be advertised out Ethernet 0.

E. Only routes matching 10.0.0.0/8 will be advertised out interfaces other than Ethernet 0.

F. All routes will be advertised out interfaces other than Ethernet 0. Answer: AE

13. Which three statements about the EIGRP routing protocol are true? (Choose three.) A. EIGRP sends periodic hello packets to the multicast IP address 224.0.0.9.
B. EIGRP sends periodic hello packets to the multicast IP address 224.0.0.10.

C. EIGRP supports five generic packet types, including hello, update, query, reply, and ACK packets.

D. EIGRP supports five generic packet types, including hello, database description (DBD), link­state request (LSR), link­state update (LSU), and LSAck.
E. EIGRP will form a neighbor relationship with another peer even when their K values are mismatched.

F. EIGRP will not form a neighbor relationship with another peer when their K values are mismatched. Answer: BCF

14. Refer to the exhibit. A network administrator has configured DHCP services on the router as shown. DHCP clients connected to the FastEthernet0/0 interface are working properly. DHCP clients connected
to the FastEthernet0/1 interface are not receiving addresses. Which two statements contain

recommendations that will solve the problem? (Choose two.)

A. The ip helper­address 10.0.0.1 command should be issued so that the address can be added to the

FastEthernet0/0 configuration.

B. The ip helper­address 10.0.0.1 command should be issued so that the address can be added to the

FastEthernet0/1 configuration.

C. A second DHCP pool for network 10.10.0.0/24 should be configured.

D. The network shown in the output under the ip dhcp pool Central command should be changed to network 10.10.0.0 with a mask of 255.255.255.0.
E. An ip dhcp excluded­address global configuration command for network 10.10.0.0/24 should be issued.
Answer: CE

15. Which two statements are true about the rendezvous point (RP) in a multicast network? (Choose two.)

A. An RP is required only in networks running Protocol Independent Multicast dense mode (PIM DM).

B. An RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM).

C. An RP is required only in networks running Protocol Independent Multicast sparse­dense mode

(PIM­SDM).

D. The multicast sources must register with the RP to form the multicast distribution tree.

E. The multicast receivers must register with the RP to form the multicast distribution tree.

F. To form the multicast distribution tree, the multicast sources register with and the receivers join the RP. Answer: BF

16. Refer to the exhibit. Given the output of a debug ip mrouting command, which two statements are true?

(Choose two.)

A. This router received an IGMP host report from a group member or a PIM join message.

B. The reverse path forwarding (RPF) for the route 224.2.0.1 failed to find the interface on which the multicast packet was received.
C. Multicast route to 10.16.0.0/16 was added to the mroute table and created by a source directly

connected to the router.

D. Multicast route to 224.69.15.0/24 was added to the mroute table and created by a source directly connected to the router.
E. The route to 224.69.15.0/24 will be out Ethernet 0.

Answer: AC

17. Refer to the exhibit. On the basis of the information presented, which statement is true?

A. A default route is configured on the local router.

B. Network 6.0.0.0/8 was learned from an OSPF neighbor within the area. C. OSPF router 5.0.0.2 is an ABR.

D. The default route is learned from an OSPF neighbor.

Answer: B

18. Based on the topology shown in the network diagram, what optional EIGRP configurations will be required in order to achieve full connectivity within AS 100?

A. Use the EIGRP no auto­summary command on R1 and R2.

B. Use the EIGRP no auto­summary command on R3 and R4.

C. Use the passive interface on the R1 and R2 interface that connects to the 10.1.1.0/24 and 10.1.2.0/24

subnet respectively.

D. Use the passive interface command between the R3 and R1 connection and between the R3 and R2

connection.

E. Use the variance command on R3. Answer: A

19. How is authentication handled with OSPFv3?

A. OSPFv3 for IPv6 authentication is supported by SHA­1 authentication. B. OSPFv3 for IPv6 authentication is supported by MD5 authentication.
C. OSPFv3 for IPv6 authentication is supported by IPv6 IPsec. D. OSPFv3 for IPv6 authentication is supported by IPv4 IPsec. Answer: C

20. Which three IP multicast group concepts are true? (Choose three.)

A. If a packet is sent to a multicast group address, all members of the multicast group will receive it.

B. If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.
C. A router does not have to be a member of a multicast group to receive multicast data.

D. A router does not have to be a member of a multicast group to send to the group.

E. A router must be a member of a multicast group to receive multicast data.

F. A router must be a member of a multicast group to send to the group. Answer: ADE

21. Which three IP multicast address related statements are true? (Choose three.)

A. Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted with Time to Live (TTL) greater than 1.
B. Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers.

C. Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link­local addresses used by PIMv2 and

IGMPv3.

D. Because they would map to overlapping IP multicast MAC addresses, multicast addresses 224.0.1.1

and 238.1.1.1 could not be used together.

E. Multicast address 224.0.1.1 has been reserved for the Network Time Protocol (NTP) by the IANA.

F. The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in purpose to RFC 1918 private unicast addresses.
Answer: CEF

22. Which command will display EIGRP packets sent and received, as well as statistics on hello packets, updates, queries, replies, and acknowledgments?
A. debug eigrp packets

B. show ip eigrp traffic

C. debug ip eigrp

D. show ip eigrp interfaces

Answer: B

23. What is the IPv6 address FF02::2 used for? A. all hosts in a local segment
B. all routers in a local segment

C. all hosts in a particular multicast group

D. all routers in an autonomous system

Answer: B

24. Which three characteristics apply to IS­IS but not to OSPF? (Choose three.) A. encapsulates PDUs directly into a data­link frame
B. uses a DIS and a backup DIS to present the psuedo­node on the LAN

C. uses stubby areas to improve network scalability

D. uses a default IOS metric of 10 on each interface

E. runs PRC (Partial Route Calculations) to calculate IP reachability information

F. uses an on­demand circuit to reduce the hello and LSA flooding across switched WAN links, such as

ISDN

Answer: ADE

25. If no metric is specified for the routes being redistributed into IS­IS, what metric value is assigned to the routes?
A. 0

B. 1

C. 10

D. 20

Answer: A

26. Which two reductions are the correct reductions of the IPv6 address

2001:0d02:0000:0000:0014:0000:0000:0095? (Choose two.) A. 2001:d02::14::95
B. 2001:0d02:::0014:::0095

C. 2001:0d02:::0014:0:0:0095

D. 2001:d02::14:0:0:95

E. 2001:d02:0:0:14::95

F. FF::0014:0:0:0095

Answer: DE

27. Refer to the exhibit. What will RTB do with a packet sourced from within AS 64200 with a destination address of 192.168.25.1?

A. It will be dropped because network 192.168.25.0 is not in the RTA routing table.

B. It will be dropped because network 192.168.25.0 is not in the RTB routing table. C. It will be forwarded to the null 0 interface of RTB and dropped.
D. It will be forwarded to the RTB 192.168.25.0 network.

Answer: D

28. Which three statements are correct about the differences in IS­IS and OSPF? (Choose three.)

A. IS­IS LSP contains TLV fields and OSPF LSU contains the LSAs.

B. New additions to the protocol are easily implemented in OSPF but not with IS­IS. C. For greater fine tuning there are more IS­IS timers.
D. OSPF has more area types than does IS­IS. E. IS­IS is more CPU­intensive than is OSPF. Answer: ACD

29. What happens when an IPv6 enabled router running 6to4 must send a packet to a remote destination

and the next hop is the address of 2002::/16?

A. The packet is tagged with an IPv6 header and the IPv6 prefix is included.

B. The IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41. C. The IPv6 packet has its header removed and replaced with an IPv4 header.
D. The IPv6 packet is dropped because that destination is unable to route IPv6 packets.

Answer: B

30. Refer to the exhibit. What is the effect of the distribute­list command in the R1 configuration?

A. R1 will filter only the 172.24.1.0/24 route from the R2 RIP updates.

B. R1 will permit only the 10.0.0.0/24 route in the R2 RIP updates.

C. R1 will filter the 10.1.0.0/24 and the 172.24.1.0/24 routes from the R2 RIP updates. D. R1 will not filter any routes because there is no exact prefix match.
Answer: C

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“BSCI – Building Scaleable Cisco Internetworks”, also known as 642-901 exam, is a Cisco certification.
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Questions and Answers : 298 Q&As
Updated: April 26th , 2008
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The Building Scalable Cisco Internetworks (BSCI 642-901) is a qualifying exam for the Cisco Certified Network Professional CCNP®, Cisco Certified Design Professional CCDP®, and Cisco Certified Internetwork Professional CCIP™ certifications. The BSCI 642-901 exam will certify that the successful candidate has important knowledge and skills necessary to use advanced IP addressing and routing in implementing scalability for Cisco ISR routers connected to LANs and WANs. The exam covers topics on Advanced IP Addressing, Routing Principles, Multicast Routing, IPv6, Manipulating Routing Updates, Configuring basic BGP, Configuring EIGRP, OSPF, and IS-IS.

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