Try Updated Cisco 642-887 Exam Questions – [Feb-2018 Dumps]

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642-887 exam questions, 642-887 PDF dumps; 642-887 exam dumps:: (130 Q&A) (New Questions Are 100% Available! Also Free Practice Test Software!)

Latest and Most Accurate Cisco 642-887 Dumps Exam Questions and Answers:

Question: 21

On the PE8-router what is the label value used to reach the network prefix?

B. imp-null
C. 16024
D. 128

Answer: C

Issue on PE8: show mpls forwarding-table
Look for the “Outgoing Label” not the “Local Label” for the prefix You will notice that the Label value is 16024.

Question: 22

On P2IOS-XR router what is targeted LDP hellos hold time on LDP session with LDP ID?

A. 90 sec
B. 10 sec
C. 3 sec
D. 8.6 sec

Answer: A

Issue on P2: show mpls ldp discovery (details).
Ps: The command show mpls ldp parameter is not Implemented.
Look at the end, you will see the hello and the holdtime values for the target neighbour. Be careful he is asking for “targeted LDP hellos hold time”. No other command will work!!! At the end of the show result you will see something looks like the following:
LDP discovery sources:
Targeted Hello -> active, passive;
Hello: 30 sec
holdtime: 90 sec

Question: 23

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

A. global pool only
B. subpool only
C. global pool and subpool
D. class-type 0 only
E. class-type 1 only
F. class-type 0 and class-type 1

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: 24

Which field in the MPLS shim header is used to support different QoS markings?

A. IP precedence
D. ToS
E. S
F. Label

Answer: C

MPLS EXP Marking
The three MPLS EXP (experimental) bits in the shim header of an input or output MPLS packet header may be set or changed by a user configured value

Question: 25

On a Cisco IOS XR router, which mechanism protects the router resources by filtering and policing the packets flows that are destined to the router that is based on defined flow-type rates?

C. Committed Access Rate
D. Control Plane Policing
E. Management Plane Protection
F. NetFlow

Answer: B

Local Packet Transport Services (LPTS) maintains tables describing all packet flows destined for the secure domain router (SDR), making sure that packets are delivered to their intended destinations.
The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing (CBWFQ).

Question: 26

When configuring LLQ (strict priority queue) on a traffic class using the Cisco IOS XR priority command on a Cisco ASR9K router, which additional QoS command is required for this traffic class?

A. shape
B. police
C. random-detect
D. bandwidth

Answer: B

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