Try These Cisco 642-887 Exam Questions – Updated 2018

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

Question: 21

Only based on the Cisco IOS XR policy-map configuration exhibit,

which statement is correct?

A. All DSCP AF41 marked packets will be dropped when the average queue length reaches 12,000 packets.
B. DSCP AF11 marked packets will be randomly dropped when the average queue length reaches 10,000 packets.
C. DSCP AF11 and AF41 marked packets are guaranteed a minimum bandwidth of 1 Mb/s.
D. DSCP AF11 and AF41 marked packets are guaranteed a maximum bandwidth of 1 Mb/s.

Answer: B

Question: 22

Referring to the show output exhibit, which statement is correct?

A. The P1 router is receiving label information for the 10.0.2.1/32 prefix from two LDP peers.
B. The P1 router is receiving label information for the 10.7.1.1/32 prefix from two LDP peers.
C. The P1 router is using the IMP-NULL local label for the 10.7.1.1/32 prefix because 10.7.1.1/32 is the loopback interface IP address on the P1 router.
D. The P1 router will perform PHP for the 10.7.1.1/32 and 10.7.10.1./32 prefixes.

Answer: B

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

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: 24

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

A. IP precedence
B. DSCP
C. EXP
D. ToS
E. S
F. Label

Answer: C

Explanation:
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?

A. LLQ
B. LPTS
C. Committed Access Rate
D. Control Plane Policing
E. Management Plane Protection
F. NetFlow
G: ACL

Answer: B

Explanation:
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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