The Secret of Cisco 642-885 pdf

Q1. The following Cisco IOS-XR configuration command will globally enable which multicast process(es) on the router? 

RP/0/RP0/CPU0:router(config)# multicast-routing 

A. IGMP only 

B. PIM only 

C. IGMP and MLD only 

D. PIM and IGMP only 

E. PIM and IGMP and MLD 

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Q2. On the PE, which two statements are correct regarding the(192.168.156.60,224.1.1.1) entry? (Choose two,) 

A. The RPF neighbor points towards the RP 

B. The RPF neighbor is reachable overthe Gi0/0/0/1 interface 

C. The OIL contains the GiO/0/0/0 interface 

D. The IIL is Null 

Q3. In Cisco IOS-XR, the ttl-security command is configured under which configuration mode? 

A. RP/0/RSP0/CPU0:P2(config)# 

B. RP/0/RSP0/CPU0:P2(config-bgp)# 

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

D. RP/0/RSP0/CPU0:P2(config-bgp-af)# 

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

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Q4. Which three statements are correct regarding PIM-SM? (Choose three.) 

A. There are three ways to configure the RP: Static RP, Auto-RP, or BSR 

B. PIM-SM only uses the RP rooted shared tree and has no option to switch over to the shortest path tree 

C. Different RPs can be configured for different multicast groups to increase RP scalability 

D. Candidate RPs and RP mapping agents are configured to enable Auto-RP 

E. PIM-SM uses the implicit join model 

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Q5. Which additional feature is provided using MLDv2 that is not available in MLDv1? 

A. Multicast Address Specific Queries 

B. Source filtering 

C. Done messages 

D. Report messages 

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Q6. Assume that the R1 router is enabled for PIM-SM and receives a multicast packet sourced from 172.16.1.100, and the R1 router has multicast receivers on the Gi0/1, Gi0/2, Gi0/3 and Gi0/4 interfaces. 

The multicast packet from the 172.16.1.100 source must arrive on which interface on the R1 router for it to be forwarded out the other interfaces? 

A. Gi0/1 

B. Gi0/2 

C. Gi0/3 

D. Gi0/4 

E. Gi0/1 or Gi0/2 or Gi0/3 or Gi0/4 

F. Gi0/2 or Gi0/3 

G. Gi0/1 or Gi0/4 

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Q7. 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 

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Q8. 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 

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Q9. 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 

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Q10. Refer to the exhibit. 

Which configuration is missing to complete the configuration task of enabling BFD with the 

192.168.1.1 EBGP peer? 

A. bfd fast-detect also needs to be enabled globally under router bgp 64500 RP/0/RSP0/CPU0:P1(config-bgp)#bfd fast-detect 

B. bfd fast-detect also needs to be enabled for the address-family under address-family ipv4 

unicast RP/0/RSP0/CPU0:P1(config-bgp-af)#bfd fast-detect 

C. bfd fast-detect also needs to be enabled for the 192.168.1.1 neighbor under neighbor 

192.168.1.1 RP/0/RSP0/CPU0:P1(config-bgp-nbr)#bfd fast-detect 

D. bfd fast-detect also needs to be enabled for the 192.168.1.1 neighbor address-family under 

neighbor 192.168.1.1 address-family ipv4 unicast RP/0/RSP0/CPU0:P1(config-bgp-nbr-af)#bfd fast-detect 

E. bfd fast-detect also needs to be enabled globally on the router 

RP/0/RSP0/CPU0:P1(config)#bfd fast-detect 

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