Cisco 642-885 Exam Study Guide To Pass

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Question No. 1

Refer to the exhibit.

Given the partial BGP configuration, which configuration correctly completes the Cisco IOS-XR route reflector configuration where both the and routers are the clients and the router is a non-client IBGP peer?

Answer: C

Question No. 2

Refer to the Cisco IOS-XR BGP configuration exhibit.

Identify two configuration errors. (Choose two.)

Answer: C, E

Question No. 3

After configuring the tunnel interface as shown in the exhibit, no IPv6 traffic is passed over the IPv4 network.

Which additional configuration is required to pass the IPv6 traffic over the IPv4 network?

Answer: B

Question No. 4

Which two features are used to provide high availability multicast? (Choose two.)

Answer: B, D

Triggered joins are sent when the primary or the secondary RPF information changes. No RPF change prunes are sent for MoFRR streams.


To perform a fast convergence (multicast-only fast reroute, or MoFRR) of specified routes/flows when a failure is detected on one of multiple equal-cost paths between the router and the source, use the mofrr command under PIM configuration mode.

mofrr rib acl_name

no rib acl_name

Question No. 5

Refer to the Cisco IOS-XR configuration exhibit.

The Cisco IOS-XR router is unable to establish any PIM neighbor relationships. What is wrong with the configuration?

Answer: B

Question No. 6

Refer to the Cisco IOS DHCPv6 configuration shown in the exhibit.

Which statement is correct?

Answer: A

Server Configuration

In Global Configuration Mode

ipv6 unciast-routing

ipv6 dhcp pool

address prefix lifetime




In Interface Configuration Mode

ipv6 address

ipv6 dhcp server rapid-commit

Client Configuration

In Global Configuration Mode


configure terminal

ipv6 unicast-routing

In Interface Configuration Mode

ipv6 address dhcp rapid commit

ipv6 enable


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