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642-661 : Configuring BGP on Cisco Routers (BGP) Last Updated Thursday, April 24, 2008 with 232 Questions
CCIP Configuring BGP on Cisco Routers (BGP)
Exam Number: 642-661 Exam
Associated Certifications: CCIP Configuring BGP on Cisco Routers (BGP)
Duration: 121 Q&As
Available Language(s): English
Exam Details
The 642-661 BGP exam is a qualifying exam for the CCIP certification. The 642-661 BGP exam tests material covered under the Configuring BGP on Cisco Routers (BGP) v 3.1 course. The BGP exam assesses a candidate’s understanding of the theory of BGP, ability to configure BGP on Cisco IOS routers, and skills with troubleshooting on BGP. As a routing protocol, BGP is one of the underlying foundations of the Internet and new-world technologies.
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QUESTION 1:
Exhibit:
Certkiller router#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M -
mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter
area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external
type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, EEGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, *
-candidate default
U - per-user static route, o - ODR
T - traffic engineered route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
B 172.16.10.0 [20/0] via 10.1.1.100, 00:00:24
B 172.16.11.0 [20/0] via 10.1.1.100, 00:00:24
172.26.0.0/28 is subnetted, 3 subnets
B 172.26.1.48 [200/0] via 192.168.1.50, 00:00:31
B 172.26.1.32 [200/0] via 192.168.1.50, 00:00:31
B 172.26.1.16 [200/0] via 192.168.1.50, 00:00:31
10.0.0.0/8 is variable subnetted, 2 subnets, 2 masks
B 10.0.0/8 [20/0] via 10.1.1.100, 00:00:24
C 10.1.1.0/24 is directly connected, Serial3
192.168.1.0/28 is subnetted, 3 subnets
C 192.168.1.32 is directly connected, Serial1
C 192.168.1.48 is directly connected, Serial2
C 192.168.1.16 is directly connected, Serial0
192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
B 192.168.2.64/28 [20/0] via 10.1.1.100, 00:00:26
Based on the show ip route output in the exhibit, how can you tell if a BGP route is
learned via IBGP or EBGP?
A. By the Metric
B. By the Next Hop
C. By the Admin Distance
D. By the code “B” or “B Ex”
Answer: C
Explanation: admin distance. Distance of EBGP is 20, Distance of IBGP is 200.
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QUESTION 2:
What is the range of values from which an ISP can assign a private AS number?
A. 32768 to 65535
B. 64512 to 65535
C. 65101 to 65535
D. 65001 to 65535
Answer: B
Explanation:
An autonomous system (AS) is a collection of networks under a single technical
administration. Some other definitions refer to a collection of routers or IP prefixes, but
in the end they all mean the same entity. The important principle is the technical
administration, which means sharing the same routing protocol and routing policy. Legal
and administrative ownership of the routers does not matter in terms of autonomous
systems. Autonomous systems are identified by AS numbers, 16-bit unsigned quantities
ranging from 1 to 65535. Public AS numbers are assigned by Internet registries. For
customers that need AS numbers to run BGP in their private networks, a range of private
AS numbers (64512 - 65535) has been reserved.
Reference: Configuring BGP on Cisco Routers volume 1 p.2-4
QUESTION 3:
Network topology exhibit
What can prevent the corresponding BGP session from being successfully
established?
A. Certkiller 2 and Certkiller 5 cannot establish the IBGP session because Certkiller 2 and
Certkiller 5 are not directly connected.
B. Certkiller 1 and Certkiller 2 establish the EBGP session if the BGP holddown timers
between the two EBGP neighbors are different.
C. Certkiller 2 and Certkiller 5 cannot establish the IBGP session using the loopback0
interface if the EBGP-multihop value is set to the default value.
D. Certkiller 1 and Certkiller 2 cannot establish the EBGP session using the loopback0
interface if the EBGP-multihop value is set to the default value.
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Answer: D
QUESTION 4:
Exhibit:
How should the EBGP session between R1 and R2 be established to enable load
balancing? (Choose three)
A. Use the maximum-paths 2 option.
B. Use the ebgp-multihop 2 option.
C. Use static routes on R1 and R2 to reach the other router’s loopback.
D. Establish a single EBGP session using the loopback0 interface IP address on R1 and R2.
E. Establish twp EBGP sessions using both the S0 and S1 interface IP address on R1 and R2.
Answer: B, C, D
Explanation:
1. B R1 - R2 requires a EBGP ebgp-multihop of 2.
2. C Requires two static routes going to each other router loopback interface
3. D A BGP session of course is required. Only a single connection is required. Use the
loopback is what allows things to work even during a failure
Wrong Answer
1. A This is not required because there is only on EBGP path. Would need two if static
routes were not define and were going between different routers
2. E Not an efficient way of doing things requires double the tables and bandwidth for
updates
QUESTION 5:
Which two statements are true about an EBGP session or an IBGP session? (Choose
two.)
A. IBGP uses AS-Path to detect routing information loops within the AS.
B. EBGP routes have a default Admin Distance of 20 and IBGP routes have a default
Admin Distance of 200.
C. No BGP attributes are changed in EBGP updates except for the next-hop attribute if
next-hop-self is configured.
D. Routes learned from an EBGP peer not advertised to another EBGP peer to prevent
routing information loops.
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E. IBGP uses split horizon to prevent routing information loops; routes learned from an
IBGP peer are not advertised to another IBGP peer.
Answer: B, E
QUESTION 6:
Network Topology Exhibit
Exhibit #2: Certkiller 2 configuration
When Certkiller 2 sends the TCP SYN packet to Certkiller 3 to establish the IBGP
session, what will be the source IP address of the TCP SYN packet from Certkiller 2
to Certkiller 3?
A. 2.2.2.2
B. 3.3.3.3
C. 10.1.1.1
D. 10.1.1.2
Answer: C
QUESTION 7:
Network topology Exhibit
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How should the EBGP session between Certkiller 1 and Certkiller 2 be established to
enable load balancing? (Choose three.)
A. Use the maximum-paths 2 option
B. Use the ebgp-multihop 2 option
C. Use static routes on Certkiller 1 and Certkiller 2 to reach the other router’s loopback
D. Establish a single EBGP session using the loopback0 interface IP address on
Certkiller 1 and Certkiller 2
E. Establish two EBGP sessions using both the S0 and D1 interface IP address on
Certkiller 1 and Certkiller 2
Answer: B, C, D
QUESTION 8:
Exhibit
What can prevent the corresponding BGP session from being successfully
established?
A. CK2 and CK5 cannot establish the IBGP session if the BGP Hello Timer between the
two IBGP neighbors is different.
B. CK1 and CK2 cannot establish the EBGP session if the BGP Hello Timer between the
two EBGP neighbors are different.
C. CK1 and CK2 cannot establish the EBGP session using the loopback0 interface if the
EBGP-mutlihop value is set to 2.
D. CK2 and CK5 cannot establish the IBGP session because they are not using the
loopback0 interface to establish the IBGP session.
E. CK2 and CK5 cannot establish the IBGP session if CK3 and CK4 have an access list
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permitting only TCP port 80 and IP protocol number 89 traffic.
Answer: E
QUESTION 9:
The Outbound Route Filter (ORF) capability is negotiated between BGP neighbors
during the BGP ____ process via the _____ message.
A. route propagation; Update
B. session establishment; Open
C. route propagation; Notification
D. route propagation; Route Refresh
E. session establishment; Route Refresh
Answer: B
Explanation: Capabilities are negotiated during session establishment in the open
message. Appendix C P456 Internet routing Architectures.
Wrong
1. A needs to be decided before update
2. C notification is an error message
3. D not a message type
4. E not a message type
QUESTION 10:
BGP table
Address Prefix AS-Path Next hop Communities Other attr.
10.0.0.0 /8 65100 65101 1.1.1.1 65101:111
… … … … … …
IP routing table
Protocol Address Prefix Next-hop Outgoing interface
BGP 10.0.0.0 /8 1.1.1.1
OSPF 1.1.1.1 /32 172.16.1.2 Ethernet 0
conn. 172.16.1.0 /24 Ethernet 0
IP routing table
Protocol Address Prefix Next-hop Outgoing
interface
BGP 10.0.0.0 /8 1.1.1.1
OSPF 1.1.1.1 /32 172.16.1.2 Ethernet 0
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conn. 172.16.1.0 /24 Ethernet 0
To forward a packet to 10.0.0.0/8, the router perform the following steps:
Step 1. Search the ip routing table for a route to reach the 10.0.0.0/8 network.
Step 2. ___________________________
Step 3. Find the connected outgoing interface to reach 172.16.1.2.
Step 4. Arp for the 172.16.1.2 MAC address if it is not already in the ARP cache.
Step 5. Store the 172.16.1.2 MAC address in the Fast Switching cache for successive
packets to network 10.0.0.0.
What is step 2?
A. Search the BGP table for an IGP route to reach the BGP next-hop 1.1.1.1.
B. Search the BGP table for an IBGP route to reach the BGP next-hop 1.1.1.1.
C. Search the IP routing table for an IGBP route to reach the BGP next-hop 1.1.1.1.
D. Search the IP routing table for an IGP route to reach the BGP next-hop of 1.1.1.1.
Answer: D
Explanation: Routing table specifies to get to 10.0.0.0 goto 1.1.1.1. To get to 1.1.1.1
do a lookup in the routing table on the next hop.
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