Cisco 642-883 Exam Preparation Guide

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Question No. 1

An engineer checks the logs in a PE with several customers and sees this output.

*Nov 3 21:44:54:219: %TCP-6-BADAUTH: No MD5 digest from 192.168.1.2(179) to 192.168.1.1(15926) (RST) tableid -0.

Which routing protocol is reporting the issue?

Answer: B

Question No. 2

When implementing OSPF, which type of networks require DR/BDR election?

Answer: B

Question No. 3

Which three valid session commands are supported by peer session templates? (Choose three.)

Answer: A, C, E

Question No. 4

Refer to the exhibit.

Based on the Cisco IOS XR route policy configuration, when redistributing OSPF routes into IS-IS, to which of the following does the “tag” value correspond?

Answer: C

Question No. 5

When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)

Answer: B, D, E

The default metric style for single topology is narrow metrics. However, you can use either wide metrics or narrow metrics. How to configure them depends upon how single-topology is configured. If both IPv4 and IPv6 are enabled and single-topology is configured, the metric style is configured in the address-family ipv4 stanza. You may configure the metric style in the address-family ipv6 stanza, but it will be ignored in this case. If IPv6 only is enabled and single topology is configured, then the metric style is configured in the address-family ipv6 stanza.

Question No. 6

A network engineer must provide support to a very large customer running a flat IS-IS Level 2 network. The engineer is willing to redesign the infrastructure in a multiarea fashion due to the rapid growth of the data traffic and newly-required scaling factors. Which consideration is important when implementing the new IS-IS Level 1 areas?

Answer: B

Question No. 7

Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature? (Choose two.)

Answer: A, B

http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fsbgporf.pdf

Restrictions for BGP Prefix-Based Outbound Route Filtering

* The BGP Prefix-Based Outbound Route Filtering feature does not support IP multicast routes.

* IP addresses that are used for outbound route filtering must be defined in an IP prefix-list. BGP distribute lists and IP access lists are not supported.

* Outbound route filtering is configured on only a per-address family basis and cannot be configured under the general session or BGP routing process (Router(config-router)#).

* Outbound route filtering is configured for only external peering sessions.

Question No. 8

When configuring BGP on Cisco IOS XR Software, which address-family is enabled by default?

Answer: F

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38bgp.pdf

An address family must be explicitly configured in the router configuration mode for the address family to be active in BGP. Similarly, an address family must be configured under the neighbor for the BGP session to be established for that address family. An address family must be configured in router configuration mode before it can be configured under a neighbor.

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