TestInside 642-691
CCIP BGP + MPLS Exam (BGP + MPLS) : 642-691 Exam
Exam Number/Code: 642-691
Exam Name: CCIP BGP + MPLS Exam (BGP + MPLS)
Questions and Answers: 96 Q&As
Price: $79.00
Update Time: 2008-6-12
“CCIP BGP + MPLS Exam (BGP + MPLS)”, also known as 642-691 exam, is a Cisco certification.
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1.For which purpose is the command mpls ldp maxhops used?
A. In large ATM-MPLS networks, the LFIB can become too large and it may be necessary to limit the maximum diameter of the MPLS LSPs.
B. Because downstream-on-demand label allocation uses hop count to control loop detection, it maybe necessary to limit the maximum diameter of the MPLS network.
C. Because end-to-end delay can cause problems with some voice applications, it may be
necessary to limit the maximum diameter of the MPLS network.
D. When interconnecting large frame mode MPLS and cell mode networks it may be necessary to limit the maximum network diameter to prevent forwarding loops.
ANSWER:B
2.
Refer to the diagram. What problem can be caused by the second P router summarizing the
loopback address of the egress PE router?
A. The first P router will be faced with a VPN label which it does not understand.
B. The second P router will be faced with a VPN label which it does not understand.
C. The egress PE router will not be able to establish a label switch path (LSP) to the ingress PE
router.
D. A label switch path (LSP) will be established from the ingress PE router to the egress PE router,
an event that is not desirable.
E. The ingress PE router will not be able to receive the VPN label from the egress PE router via
MP-IBGP. ANSWER:B
3.In a central services topology, which routes do client VRFs contain?
A. routes from the client site, but not from the server site B. routes from the server site, but not from the client site C. routes from both the client site and the server site
D. only EBGP routes from either the client site or the server site
ANSWER:C
4.
On a dedicated subinterface implementation, PE-2 must establish an address-family vrf IPv4 BGP
neighbor relationship with which router? A. CE-1
B. CE-2
C. PE-1
D. PE-IG
E. CE-1 and CE-2
F. PE-1 and PE-IG ANSWER:B
5.What are three drawbacks of a peer-to-peer VPN using a shared provider edge (PE) router?
(Choose three.)
A. A full mesh of virtual circuits is required between the customer sites. B. All the customers have to share a common IP address space.
C. Optimal routing between customer sites cannot be guaranteed. D. The shared PE router has to know all routes for all customers.
E. Packet filters are required on the PE routers. ANSWER:BDE
6.Drag the BGP MED function on the left to the command that enables it on the right. Not all apply.
Enable MED comparison among paths learned from
confederation peers.
bgp deterministic med
Enable the MED to override the local preference in
the route selection process
bgp always-compare-med
Allow the comparison of MED for paths from
neighbors in different autonomous systems
bgp bestpath med-confed
Enable the a path with a higher MED value to be
preferred over a path with a lower MED value
Enforce the comparison of MED between all paths
received from the same autonomous system
7. Which two of the following statements regarding LDP are true? (Choose two.)
A. LDP can also be used between nonadjacent routers using multicast LDP hello messages.
B. LDP does not require periodic hello messages once the LDP session has been established between the LDP peers.
C. LDP hello messages use TCP packets with a destination port number of 646.
D. Multiple sessions can be established between a pair of LSRs if they use multiple label spaces.
E. Per-platform label space can be identified by a label space ID of 0 in the LDP identifier field. ANSWER:DE
8.What does the following command accomplish? sanjose#clear ip bgp 10.1.1.1 in prefix-filter
A. The sanjose router will perform an outbound soft reconfig to the 10.1.1.1 neighbor.
B. The sanjose router will send out the ORF prefix-list so that a new route refresh will be received from the 10.1.1.1 neighbor.
C. The 10.1.1.1 router will perform an inbound soft reconfig on the updates from the sanjose neighbor.
D. The 10.1.1.1 router will send out the ORF prefix-list so that a new route refresh will be received
from the sanjose neighbor.
E. The bgp session between the sanjose and the 10.1.1.1 router will be reset so that all the new bgp updates from the 10.1.1.1 router can be processed by the inbound prefix-list at the sanjose router.
F. The bgp session between the sanjose and the 10.1.1.1 router will be reset so that all the new bgp updates from the sanjose router can be processed by the inbound prefix-list at the 10.1.1.1 router.
ANSWER:B
9. Which command is used to configure the external, confederation-wide AS number? A. router(config)#router bgp {as-number}
B. router(config-router)#bgp confederation peers {as-number}
C. router(config-router)#bgp confederation identifier {as-number} D. router(config-router)#bgp cluster-id {as-number}
E. router(config-router)#neighbor {ip address} remote-as {as-number} ANSWER:C
10.As the penalty for a flapping route decreases and falls below a certain limit, the route is
unsuppressed. What is the name of that limit? A. half-life limit
B. suppress limit
C. max-suppress-time limit
D. reuse limit
E. unsuppress limit
F. penalty limit
ANSWER:D
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