Cisco 642-885 Practice Exam Questions Avaialble

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Question No. 1

Which command set implements BGP support for NSF/SSO on Cisco IOS XE between a PE and a route reflector?

Answer: A

Question No. 2

What is enabled by default on Cisco IOS-XR routers and cannot be disabled?

Answer: C

Before using the BGP policy accounting feature, you must enable BGP on the router (CEF is enabled by default).

Question No. 3

Instructions

Which two statements regarding the BGP peerlngs are correct? (Choose two)

Answer: A, E

#show ip bgp

Question No. 4

Which difference occurs between intradomain and interdomain routing technology?

Answer: A

Question No. 5

Which two methods represent IPv6 tunneling implementations? (Choose two.)

Answer: B, C

Question No. 6

Which two BGP mechanisms are used to prevent routing loops when using a design with redundant route reflectors? (Choose two.)

Answer: A, C

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37bgp.html

As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops:

*Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector.

The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored.

*Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored.

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