The Secret of Cisco 642-885 practice test

Q1. What are three BGP configuration characteristics of a multihomed customer that is connected to multiple service providers? (Choose three.) 

A. The multihomed customer can use local preference to influence the return traffic from the service providers 

B. The multihomed customer announces its assigned IP address space to its service providers through BGP 

C. The multihomed customer has to decide whether to perform load sharing or use a primary/backup implementation 

D. The multihomed customer must use private AS number 

E. The multihomed customer configures outbound route filters to prevent itself from becoming a transit AS 

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Q2. Given the IPv6 address of 2001:0DB8::1:800:200E:88AA, what will be its corresponding the solicited-node multicast address? 

A. FF01::1:200E:88AA 

B. FF01::1:FF0E:88AA 

C. FF01:0DB8::1:800:200E:88AA 

D. FF02::1:FF0E:88AA 

E. FF02::1:200E:88AA 

F. FF02:0DB8::1:800:200E:88AA 

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Q3. Which mechanism is used by an IPv6 multicast receiver to join an IPv6 multicast group? 

A. IGMP report 

B. IGMP join 

C. MLD report 

D. General query 

E. PIM join 

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Q4. When implementing source-based remote-triggered black hole filtering, which two configurations are required on the edge routers that are not the signaling router? (Choose two.) 

A. A static route to a prefix that is not used in the network with a next hop set to the Null0 interface 

B. A static route pointing to the IP address of the attacker 

C. uRPF on all external facing interfaces at the edge routers 

D. Redistribution into BGP of the static route that points to the IP address of the attacker 

E. A route policy to set the redistributed static routes with the no-export BGP community 

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Q5. 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 

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Q6. 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 

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Q7. You noticed a recent change to the BGP configuration on a PE router, the bgp scan time has been changed from the default value to 30s. Which three effects will this change have? (Choose three.) 

A. The BGP table will be examined and verified more frequently 

B. The BGP keepalive messages will be sent to the BGP peers at a faster rate 

C. The BGP table will be modified more quickly in the event that a next-hop address becomes unreachable 

D. The CPU load of the router will increase 

E. The minimum time interval between sending EBGP and IBGP routing updates will decrease 

F. The BGP convergence time will increase 

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Q8. Which router Is configured as the RPforthe 234.1.1.1 multicast group and which Is the multicast source that is currently sending traffic to the 234.1.1.1 multicast group? (Choose two.) 

A. CE5 

B. PE5 

C. PE6 

D. 10.5.10.1 

E. 10.5.1.1 

F. 192.168.156.60 

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Q9. A junior network engineer has just configured a new IBGP peering between two Cisco ASR9K PE routers in the network using the loopback interface of the router, but the IBGP neighborship is not able to be established. Which two verification steps will be helpful in troubleshooting this problem? (Choose two.) 

A. Verify that the network command under router BGP is configured correct on each router for announcing the router's loopback interface in BGP 

B. Verify that the ibgp-multihop command under the BGP neighbor is configured correctly on each router 

C. Verify that the loopback interfaces are reachable over the IGP 

D. Verify that the update-source loopback command under the BGP neighbor is configured correctly on each router 

E. Verify that the ttl-security command under the BGP neighbor is configured correctly on each router to enable the router to send the BGP packets using a proper TTL value 

F. Verify that the UDP port 179 traffic is not being blocked by an ACL or firewall between the two IBGP peers 

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Q10. 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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