Cisco 642-887 Exam PDF Study Guide

These 642-887 exam braindumps contain updated knowledge of Implementing Cisco Service Provider Next-Generation Core Network Services topics.

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Question No. 1

Scenario:

From PE8 router, what is the label action used to reach the P2 loopback 0 interface 10.0.2.1/32?

Answer: C

show mpls forwarding-table , find prefix 10.0.2.1 and you will see there under outgoing Label “Pop Label” (This is actually logic because the prefix is directly connected and therefore the packet will forward without label). If the router should forward any packet to that prefix, the packet should be received with Local label on PE8 (Local Label = 35), the router will remove it and forward it without Label.

Question No. 2

An engineer deployed a Cisco MPLS TE next-hop protection over a switched environment. While testing the link protection, an excessive IGP delay in the reconvergence time is seen. Which action fixes this issue?

Answer: B

Question No. 3

Cisco MPLS TE tunnels recently have been deployed to minimize the utilization of a congested link in the core network. Thetunnels are up and the administrative weight is correctly configured, but no improvement has occurred since they went into production. Which IOS command can be used to modifyCisco MPLS TE path selection on an interface?

Answer: A

Question No. 4

When defining an explicit MPLS TE tunnel path, which two command options are available under the explicit-path configuration mode? (Choose two.)

Answer: A, C

Question No. 5

DS-TE implementations on Cisco routers support which bandwidth pool(s) and class type(s)? (Choose two.)

Answer: C, F

Differential Service Tunnels

Differential Service Traffic Engineering (TE) is an extension of the regular MPLS Traffic Engineering (MPLSTE) feature. Regular TE does not provide bandwidth guarantees to different traffic classes. A single bandwidth pool (global pool) is used in regular TE that is shared by all traffic. In order to support various class of service (CoS), the ability to provide multiple bandwidth pools is required. These bandwidth pools then can be treated differently based on the requirement for the traffic class using that pool.

In RSVP global and subpools reservable bandwidths are configured on a per interface basis to accommodate TE tunnels on the node. Available bandwidth from all configured bandwidth pools is advertised using Interior Gateway Protocol (IGP). RSVP is used to signal the TE tunnel with appropriate bandwidth pool requirements.

Question No. 6

At which layer does Cisco recommend the QoS trust boundary be set for an enterprise network environment?

Answer: C

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