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Exam Number/Code: 642-661
Exam Name: CCIP Configuring BGP on Cisco Routers (BGP)
Questions and Answers: 98 Q&A
Duration: 90 Minutes (50-70 questions)
Available Languages: English
Test Register: Pearson VUE or Prometric
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Exam : Cisco 642-661
Title : CCIP Configuring BGP on Cisco Routers (BGP)

1. When creating iBGP multipaths which three criteria must be met by multiple paths to the same destination? (Choose three.)
A. Router IDs must be the same on all routers.
B. Each destination must have a different next-hop address.
C. The destination AS-number must be different for each destination.
D. Multi-exit discriminator attributes must be the same on all paths.
E. Interior Gateway Protocol distance must be identical on each path.
Answer: B, D, E

2. What are two purposes of the BGP scan-time command? (Choose two.)
A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
B. to allow faster detection of downed BGP peers
C. to improve BGP convergence time
D. to tune the BGP update interval
E. to decrease the effects of unstable routes by increasing the route suppression time
Answer: A, C

3. Which two of these statements about hierarchical route reflectors are correct? (Choose two.)
A. A route reflector can be a client of another route reflector.
B. Each cluster within the hierarchy can only contain one route reflector.
C. The hierarchy can be as deep as needed.
D. A route reflector can have clients in different clusters.
E. Hierarchical route reflectors are set up using three levels (access, distribution, and core layers).
Answer: A, C

4. Drag the method used to influence BGP path selection on the left to the traffic flow it influences on the right.
Answer:

5. Based on the physical topology of AS 50001, to reduce the IBGP full-mesh requirements, only two redundant route reflectors (RR) will be used in a single cluster. In this case, which two routers should be the RRs and which three routers should be the clients based on the recommended route reflector design rule?
Task: 1) Drag the matching text labels given on the left side of the topology to the correct targets on the right to identify these routers.
2) Also, identify all the unnecessary IBGP sessions once the redundant RRs have been configured by clicking on the IBGP session links to disable them. You can re-enable the IBGP sessions link by clicking on it again.
Answer:

6. Lab
Answer: Sorry, see the next version!

7. Which BGP configuration option is designed to reduce router processing load caused by unstable routes?
A. neighbor {ip-address} maximum-prefix {number}
B. bgp dampening
C. no sync
D. bgp deterministic-med
E. sync
F. bgp scan-time
Answer: B

8. Which configuration will enable the R1 router in the AS51003 sub-AS (member-AS) as a route reflector with neighbors 10.1.1.1 and 10.2.2.2 as its route-reflector clients?
A. !
R1 router bgp 51003
bgp confederation identifier 55111
bgp confederation peers 51001 51002
neighbor 10.1.1.1 remote-as 51003
neighbor 10.2.2.2 remote-as 51003
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client
B. !
R1 router bgp 51003
bgp confederation identifier 55111
bgp confederation peers 51001 51002
neighbor 10.1.1.1 remote-as 51001
neighbor 10.2.2.2 remote-as 51002
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client
C. !
R1 router bgp 55111
bgp confederation identifier 51003
neighbor 10.1.1.1 remote-as 51003
neighbor 10.2.2.2 remote-as 51003
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client
D. !
R1 router bgp 55111
bgp confederation identifier 51003
neighbor 10.1.1.1 remote-as 55111
neighbor 10.2.2.2 remote-as 55111
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client
Answer: A

9. Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature? (Choose two.)
A. IP multicast routes are not supported.
B. Outbound route filtering is configured only on a per-address family basis.
C. Outbound route filtering can be configured for either iBGP or eBGP sessions.
D. The outbound route filter can be defined in a Prefix list, Distribute list or Access lists.
E. Outbound route filtering is more effective when a distance vector IGP is used.
Answer: A, B

10. What can cause a single sourced iBGP route not to be selected as the best route?
A. The BGP MED is 0.
B. The BGP next-hop is unreachable.
C. The BGP origin is incomplete.
D. The BGP weight is 0.
E. The BGP local preference is 0.
F. BGP synchronization is disabled.
Answer: B

11. 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

12. List the BGP route selection steps in the correct order
Answer:

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