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Cisco 642-885 Exam - Cheat-Test.com

Free 642-885 Sample Questions:

Q: 1
When implementing interdomain multicast routing, which mechanism can be used to advertise multicast sources in one domain to the other domains, allowing the RPs to build interdomain multicast distribution trees?
A. Multiprotocol BGP
B. PIM
C. MSDP
D. Auto RP
E. BSR
F. MLD
Answer: C

Q: 2
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

Q: 3
What is determined by running the same hash algorithm on all PIMv2 routers?
A. The SPT from the RP to the multicast source
B. The SPT from the last hop router to the multicast source
C. Auto RP election
D. Which BSR to use for a particular multicast group
E. Which RP to use from a set of candidate RPs in the RP set
Answer: E

Q: 4
When configuring PIM operations, what is the effect of setting the SPT threshold to infinity?
A. The multicast source to the RP path will never switch over to the shortest path tree
B. All the PIM routers will have more (S,G) states, thus consuming more router resources
C. The receivers will be able to immediately switch over to the shortest path tree after receiving the first multicast packets on the shared tree via the RP
D. The last-hop routers will never switch over to the shortest path tree and will always remain on the shared tree
Answer: D

Q: 5
Which multicast group range is reserved for SSM?
A. 224.0.0.0/8
B. 225.0.0.0/8
C. 232.0.0.0/8
D. 239.0.0.0/8
Answer: C


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