Down to date 642-885 Exam Study Guides With New Update Exam Questions

Q1. 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 

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Q2. The 224.192.16.1 multicast IP address maps to which multicast MAC address? 

A. 01-00-5E-C0-10-01 

B. 01-00-5E-40-10-01 

C. 01-00-5E-00-10-01 

D. 01-00-5E-C0-16-01 

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Q3. 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) 

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Q4. Which three methods can be used to reduce the full-mesh IBGP requirement in a service provider core network? (Choose three.) 

A. implement route reflectors 

B. enable multi-protocol BGP sessions between all the PE routers 

C. implement confederations 

D. implement MPLS (LDP) in the core network on all the PE and P routers 

E. enable BGP synchronization 

F. disable the IBGP split-horizon rule 

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Q5. 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 

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Q6. Which statement is correct regarding using the TTL threshold to define the delivery boundaries of multicast traffic? 

A. If a packet TTL is less than the specified TTL threshold, the packet is forwarded out of the interface 

B. If a packet TTL is greater or equal to the specified TTL threshold, the packet is forwarded out of the interface 

C. If a packet TTL is equal to the specified TTL threshold, the packet is dropped 

D. When a multicast packet arrives, the TTL threshold value is decremented by 1. If the resulting TTL threshold value is greater than or equal to 0, the packet is dropped 

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Q7. When implementing IP SLA icmp-echo probes on Cisco IOS-XE routers, which two options are available for IPv6? (Choose two.) 

A. flow-label 

B. hop-limit 

C. DSCP 

D. traffic-class 

E. TOS 

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Q8. 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 

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