642-887 by Cisco Actual Free Exam Q&As

Question 1

An engineer must configure a policy an a Cisco IOS XE router that achieves the following:
* Traffic 2 mbps or lee is transmitted.
* Traffic between 2mbps is marked with IP Precedence 4.
* Traffic that exceeds 3mbps is dropped.
Which configuration achieves this policy?

A. Option D B. Option A C. Option B D. Option C

Discussion 0

Correct Answer: A Vote an answer

Question 2

When troubleshooting LDP operations on the Cisco IOS and IOS XE routers, what is one of the first things that should be verified?

A. verify in the running configurations that all of the required LDP interfaces are defined under the mpls ldp command configuration mode B. verify if there are any access lists that are denying TCP and UDP port 464 packets C. if running OSPF as the IGP, ensure that OSPFv3 has been enabled D. check if the ip cef command has been enabled

Discussion 0

Correct Answer: D Vote an answer

Question 3

Which two factors must you consider when configuring MPLS EXP? (Choose two.)

A. MPLS EXP marking is supported in the ingress direction B. MPLS EXP marking is supported in the egress direction C. MPLS EXP classification for bridged MPLS packets on EVCs is supported D. A packet that MPLS classifies at ingress can be reclassified by IP ToS at egress E. A packet that IP ToS classifies at ingress can be reclassified by MPLS EXP at egress

Discussion 0

Correct Answer: A,D Vote an answer

Question 4

Which option is a Cisco-recommended congestion management or queuing method for real-time traffic for voice and video?

A. WFQ B. LLQ C. PQ D. CB-WFQ

Discussion 0

Correct Answer: B Vote an answer

Question 5

Which two benefits does MPLS provide? (Choose two.)

A. forwarding that occurs through the use of source and destination labels instead of source and destination IP addresses B. no need for Layer 2 protocols such as Ethernet or Frame Relay when MPLS switching is enabled C. switching technology that negates the need for routing protocols D. explicit or constraint-based routing E. scalable support for VPNS

Discussion 0

Correct Answer: B,E Vote an answer

Question 6

Which configuration set enables outbound label filtering so that only peer 192.168.10.1 receives label advertisements in an MPLS environment?
A)

B)

C)

D)

A. Option D B. Option A C. Option B D. Option C

Discussion 0

Correct Answer: A Vote an answer

Question 7

Which statement defines how MPLS LDT Graceful Restart works after a service interruption?

A. It works independent of neighboring routers to recover MPLS forwarding information B. It works by helping neighboring routers with MPLS LDP SSO/NSF and Graceful Restart to recover MPLS forwarding information C. It works independent of neighboring non-LDP Graceful Restart routers to recover MPLS forwarding information D. It works by helping all neighboring MPLS LDP routers to recover MPLS forwarding information

Discussion 0

Correct Answer: B Vote an answer

Question 8

Refer to the Cisco IOS XR policy-map configuration exhibit.

What is wrong with the policy-map configuration?

A. missing the police command under class one and class two B. missing the police command under class three C. missing the priority percent command under class one and class two D. missing the priority bandwidth command under class one and class two E. missing the bandwidth command under class one and class two

Discussion 0

Correct Answer: A Vote an answer

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Question 9

Which two values are class-selector DSCP values? (Choose two.)

A. 111000 B. 100000 C. 000001 D. 000111 E. 001001

Discussion 0

Correct Answer: A,B Vote an answer

Question 10

Which three options are class maps able to match? (Choose three.)

A. match destination-port B. match all C. match protocol http url "*cisco" D. match mac-address E. match access-group F. match DSCP

Discussion 0

Correct Answer: C,E,F Vote an answer

Question 11

Which option shows how a class map is implemented that matches only packets originating from the network
10.0.0.0/8, which are not marked as VoIP on Cisco IOS XE?
A)

B)

C)

D)

A. Option D B. Option A C. Option B D. Option C

Discussion 0

Correct Answer: C Vote an answer

Question 12

Refer to the exhibit.

IT administrators report packet loss on the critical applications coming with CoS 4. Which option is the appropriate configuration to have a lower drop probability when the packets are processed using DSCP values?

A. set ip dscp af22 B. set ip dscp af32 C. set ip dscp af13 D. set ip dscp af41

Discussion 0

Correct Answer: D Vote an answer

Question 13

Which option describes the IPv6 flow label field?

A. an 8-bit field used for labeling a traffic flow B. an 8-bit field out of which the first 6 are used to classify packets C. a 3-bit field used for marking a traffic flow D. a 20-bit field used to tag a traffic flow throughout the network

Discussion 0

Correct Answer: D Vote an answer

Cisco Implementing Cisco Service Provider Next-Generation Core Network Services - 642-887 Exam Practice Test