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Q31. In Cisco IOS-XR, the maximum-prefix command, to control the number of prefixes that can be installed from a BGP neighbor, is configured under which configuration mode? 

A. RP/0/RSP0/CPU0:P2(config-bgp)# 

B. RP/0/RSP0/CPU0:P2(config-bgp-af)# 

C. RP/0/RSP0/CPU0:P2(config-bgp-nbr)# 

D. RP/0/RSP0/CPU0:P2(config-bgp-nbr-af)# 

Answer: D 


Q32. Which of the following can be used by dual-stack service providers supporting IPv4/IPv6 customers with dual-stack hosts using public IPv6 addresses and private IPv4 addresses? 

A. NAT64 

B. 6RD 

C. 6to4 tunnels 

D. Carrier-grade NAT 

Answer: D 


Q33. 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) 

Answer: A 


Q34. 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 


Q35. On the PE5 router, which statement Is correct regarding the learned BGP prefixes? 

A. The 209.165.201.0/27 prefix is received from the 10.0.1.1 IBGP peer which is a route reflector 

B. The 172.16.66.0/24 prefix BGP next-hop points to the route reflector 

C. All prefixes learned on PE5 has the default local prefernce value 

D. The 209.165.202.128/27 prefix is originated by the 10.0.1.1 IBGP peer 

Answer: C #show ip bgp-- check i tag for PE5 


Abreast of the times 642-885 exam:

Q36. With IPv6 multicast, which feature can be used as a replacement method for static RP configuration? 

A. PIM Snooping 

B. MLD 

C. MLD Snooping 

D. Embedded RP 

E. DHCPv6 

Answer: D 


Q37. Refer to the Cisco IOS-XR show output exhibit. 

Which two statements are correct? (Choose two.) 

A. The RPF neighbor 192.168.11.1 is the path towards the RP for the 224.1.1.1 multicast group 

B. The RP for the 224.1.1.1 multicast group is reachable over the Gi0/0/0/0 interface 

C. This router is the RP for the 224.1.1.1 multicast group 

D. Incoming 224.1.1.1 multicast group traffic will be sent out through the Gi0/0/0/0 interface 

E. Incoming 224.1.1.1 multicast group traffic will be sent out through the Gi0/0/0/2 interface 

Answer: A,D 


Q38. Refer to the exhibit. 

Which statement correctly explains the bgp graceful-restart command? 

A. This command is used to enable NSR and is entered on the NSR-capable router, and also on any NSR-aware peer 

B. This command is used to enable NSF and is entered on the NSF-capable router, and also on any NSF-aware peer 

C. This command is only required on the NSF-capable routers to enable BGP graceful restart with the BGP peers 

D. This command is only required on the NSF-aware routers to enable BGP graceful restart with the BGP peers 

E. This command is only required on the NSR-capable routers to enable BGP graceful restart with the BGP peers 

Answer: B 


Q39. 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 


Q40. Which three statements regarding NAT64 operations are correct? (Choose three.) 

A. With stateful NAT64, many IPv6 address can be translated into one IPv4 address, thus IPv4 address conservation is achieved 

B. Stateful NAT64 requires the use of static translation slots so IPv6 hosts and initiate connections to IPv4 hosts. 

C. With stateless NAT64, the source and destination IPv4 addresses are embedded in the IPv6 addresses 

D. NAT64 works in conjunction with DNS64 

E. Both the stateful and stateless NAT64 methods will conserve IPv4 address usage 

Answer: A,C,D