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2017 Jan 642-885 exam cram

Q41. Which three statements regarding the BGP operations are correct? (Choose three) 

A. PE5 is the route reflector with P1 and PE6 as its client 

B. PE5 is using the IS-IS route to reach the BGP next-hop for the 172.16.66.0/24 prefix 

C. PE5 has BGP route dampening enabled 

D. The BGP session between PE5 and P1 is established using the loopback interface and next- hop-self 

E. The BGP session between PE5 and CE5 is established using the loopback interface 

Answer: A,C,D 


Q42. RAG DROP 

Answer: 

The amount of time for the penalty to decrease to one-half of its current value - 60 Suppress a route when its penalty exceeds this value - 2400 If a flapping route penalty decreases and falls below this value , the route is unsuppressed - 600 The maximum time a route can be suppressed - 240 


Q43. Which types of multicast distribution tree can PIM-SM use? 

A. Only shared tree rooted at the source 

B. Only shared tree rooted at the RP 

C. Only shortest path tree rooted at the RP 

D. Shared tree rooted at the source and shortest path tree switchover 

E. Shared tree rooted at the RP and shortest path tree switchover F. Shared tree rooted at the first-hop router and shortest path tree rooted at the RP 

Answer:


Q44. Refer to the EBGP configuration on a PE IOS-XR router exhibit. 

After the EBGP configuration, no routes are accepted from the EBGP peer, nor are any routes advertised to the EBGP peer. 

What could be the problem? 

A. The update-source neighbor configuration command must also be configured 

B. The next-hop-self neighbor configuration command must also be configured C. EBGP neighbors must have an inbound and outbound route policy configured 

D. An access list is blocking IP protocol 179 packets between the two EBGP peers 

E. The maximum-prefix neighbor configuration command must also be configured 

Answer:


Update 642-885 free practice test:

Q45. Refer to the exhibit. 

Which three statements are correct regarding the Cisco IOS-XR configuration? (Choose three.) 

A. This router, acting as the RP mapping agent, will send RP announcement messages to the 

224.0.1.40 group 

B. This router, acting as the RP mapping agent, will send RP discovery messages to the 

224.0.1.39 group 

C. This router is the RP mapping agent only for the 224.11.11.11 and 224.99.99.99 multicast groups 

D. This router is a candidate PIM-SM RP for the 224.99.99.99 multicast group 

E. This router is a candidate PIM-BIDIR RP for the 224.11.11.11 multicast group 

F. IGMPv3 is enabled on all interfaces 

G. Other routers will recognize this router as the RP for all multicast groups with this router loopback 0 IP address 

Answer: D,E,F 


Q46. Which multicast routing protocol is most optimal for supporting many-to-many multicast applications? 

A. PIM-SM 

B. PIM-BIDIR 

C. MP-BGP 

D. DVMRP 

E. MSDP 

Answer:


Q47. What is enabled by default on Cisco IOS-XR routers and cannot be disabled? 

A. SSH server 

B. Multicast routing 

C. IPv4 and IPv6 CEF 

D. IPv6 routing 

E. CDP 

F. BFD 

Answer:


Q48. Which two statements regarding Auto RP operations and implementations are correct? (Choose two.) 

A. Candidate RPs send RP announcements to the 224.0.1.39 multicast group, and the mapping agents send RP discovery messages to the 224.0.1.40 multicast group 

B. Every PIM-SM router must be configured with the RP mapping agent IP address 

C. Candidate RPs learn the IP address of the mapping agents via periodic RP discovery messages 

D. Administrative scoping can be configured to limit the scope of the RP announcements 

E. A Reverse Path Forwarding check is done on the RP discovery messages 

F. RP discovery messages are flooded hop by hop throughout the network as multicast to the all PIM routers multicast group with a TTL of 1 

Answer: A,D 



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