Download New Latest (May) Cisco 642-887 Actual Tests 21-30

By | May 17, 2015

Ensurepass

 

QUESTION 21

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: CF

Explanation: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 22

LDP session protection uses which one to maintain the LDP session between LDP neighbors?

 

A.

LDP NSF

B.

LDP NSR

C.

backup-targeted LDP hellos

D.

BFD

E.

LDP-IGP synchronization

 

Answer: C

 

 

QUESTION 23

Which two of the following statements are correct regarding LSPs? (Choose two.)

 

A.

An LSP is created for every routing protocol entry.

B.

Each LSP is bidirectional, that is, packets traveling in the opposite direction use the same LSP.

C.

An IGP is used to populate routing tables in all routers in an MPLS domain.

D.

LDP is used to propagate labels and build LSPs.

E.

The FIB is used to forward MPLS-labeled packets down an LSP.

 

Answer: CD

 

 

QUESTION 24

Scenario:

 

 

 

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clip_image003

 

clip_image004

 

On the PE8-router what is the label value used to reach the 10.7.1.1/32 network prefix?

 

A.

10.0.2.1:0

B.

imp-null

C.

16024

D.

128

 

Answer: C

Explanation: Issue on PE8: show mpls forwarding-table Look for the “Outgoing Label” not the “Local Label” for the prefix 10.7.1.1/32. You will notice that the Label value is 16024.

 

 

QUESTION 25

DRAG DROP

 

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Answer:

clip_image006

 

A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 26

Referring to the Cisco IOS XR show command output exhibit,

 

 

 

clip_image007

 

what are three possible reasons that the GigabitEthernet0/1/0/10 LDP IGP sync status is not ready? (Choose three.)

 

A.

GigabitEthernet0/1/0/10 is not configured to run LDP.

B.

Graceful restart is not configured on the peer.

C.

The LDP neighbor on GigabitEthernet0/1/0/10 is not up.

D.

The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.

E.

LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.

F.

GigabitEthernet0/1/0/10 is a member link of Bundle-Ether9000.

 

Answer: CDE

 

 

QUESTION 27

On a Cisco router, when will the router actually reserve the bandwidth for the MPLS traffic engineering tunnel?

 

A.

during the autoroute process

B.

during constraint-based routing calculations

C.

on the receipt of the RSVP Path message

D.

on the receipt of the RSVP Resv message

 

Answer: D

 

 

QUESTION 28

What are the four fields inside the MPLS shim header? (Choose four.)

 

A.

EXP

B.

TTL

C.

Version

D.

S

E.

Length

F.

Label

G.

Type

H.

FCS

 

Answer: ABDF

Explanation:

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 29

Which Cisco IOS XR high-availability feature is used to prevent routes from being used before LDP converges?

 

A.

LDP session protection

B.

LDP-IGP synchronization

C.

BFD

D.

IGP session protection

 

Answer: B

 

 

QUESTION 30

On the Cisco ASR9K router, when using the bandwidth command to specify the minimum guaranteed bandwidth to be allocated for a specific class of traffic, what will be used as the queuing algorithm?

 

A.

custom queuing

B.

CBWFQ

C.

WFQ

D.

FIFO

E.

priority queuing

 

Answer: B

Explanation:

Class based weighted fair queuing (CB-WFQ) was initially released without the support of a priority queuing system, thus it could not guarantee the delay and jitter (delay variation) requirements of real-time, interactive voice and video conversations. Since for CBWFQ, the weight for a packet belonging to a specific class is derived from the bandwidth assigned to the class, which in turn determines the order in which packets are sent. All packets are serviced fairly based on weight and no class of packets may be granted strict priority. This scheme poses problems for voice traffic that is largely intolerant of delay, especially variation in delay

 

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