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Latest and Most Accurate Cisco 642-885 Exam Questions:
Refer to the configuration exhibit, taken from a Cisco IOS-XR router.
Which configuration change is required to properly enable this router as the signaling router for implementing source-based RTBH filtering?
A. Set community (no-export) in the route policy
B. Pass in the route policy
C. Set local-preference 1000 in the route policy
D. The 192.0.2.1/32 static route should be tagged as 666 (tag 666)
Refer to the Cisco IOS-XR BGP configuration exhibit.
Identify two configuration errors. (Choose two.)
A. The neighbor-group efg is missing the ebgp-multihop 2 configuration
B. The ttl-security configuration command is missing the option to set the number of hops
C. The passall route policy is wrong
D. The route-policy passall in and route-policy passall out commands should be configured under the neighbor-group efg instead of the af-group abc
E. The maximum-prefix 10 configuration should be configured under the af-group abc instead of the neighbor-group efg
Answer: C, E
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Refer to the Cisco IOS-XR show output exhibit.
Which statement is correct?
A. The [ ] indicates the configuration has a problem
B. The [ ] indicates the 10.1.1.1 neighbor peering session has not been established
C. The [ ] indicates the configuration was not inherited from a group
D. The [ ] indicates the configuration has not been committed
E. The [ ] indicates the corresponding BGP peer configuration has a mismatch configuration
Which two statements correctly describe the RPF check when a multicast packet arrives at a router? (Choose two.)
A. The router looks up the source address in the unicast routing table to determine if the packet has arrived on the interface that is on the reverse path back to the source
B. The router looks up the destination address in the unicast routing table to determine if the packet has arrived on the interface that is on the reverse path back to the destination
C. If the packet has arrived on the interface leading back to the destination, the RPF check passes and the packet is forwarded. If the RPF check fails, the packet is dropped
D. If the packet has arrived on the interface leading back to the source, the RPF check passes and the packet is forwarded. If the RPF check fails, the packet is dropped
Answer: A, D
When enabling interdomain multicast routing, which two statements are correct? (Choose two.)
A. Multiprotocol BGP is used instead of PIM SM to build the intradomain and interdomain multicast distribution trees
B. Use MSDP to enable the RPs from different domains to exchange information about active multicast sources
C. MSDP SA packets are sent between the multiprotocol BGP peers
D. Noncongruent unicast and multicast topologies can be supported using multiprotocol BGP
Answer: B, D
The 220.127.116.11 multicast IP address maps to which multicast MAC address?
The following Cisco IOS-XR configuration command will globally enable which multicast process(es) on the router?
A. IGMP only
B. PIM only
C. IGMP and MLD only
D. PIM and IGMP only
E. PIM and IGMP and MLD