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Cisco 642-785 Exam Syllabus Topics:

Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:

Question 1

Which of these correctly describes traffic classification using qos-group?

A. qos-group marking value ranges from 0 to 7.
B. qos-group is local to the router.
C. qos-group is only applicable to an MPLS-enabled router.
D. qos-group marking is automatically mapped to MPLS EXP marking.

Question 2

Refer to the exhibit.

A service provider moved from a three-class service provider QoS model to a four-class service provider QoS model. A new class of service called CRITICAL-B was created to support traffic with a DSCP marking of AF31. A customer reports that the traffic in the CRITICAL-B class is having problems. What step should the service provider take to correct this issue?

A. The class map for CRITICAL-B should have a DSCP value of 28.
B. The CRITICAL-A class should change from match-all to match-any.
C. The policy map should be updated to move the BULK class to the bottom of the policy.
D. The max-reserved-bandwidth command must be used to allocate more bandwidth than allowed by default.

Question 3

A customer reports that the packets from their custom TCP application, which is currently marked as DSCP AF43, is being dropped more frequently than desired. All of the links in service provider network are using DSCP-based WRED. What can be changed to best improve the drop rate of the customer's custom application without causing major problems for the other traffic classes?

A. Remove WRED on all the links.
B. Use a different queuing method for the AF43 traffic class.
C. Mark the custom application traffic to DSCP AF41 instead.
D. Allocate more bandwidth to the AF43 traffic class.
E. Mark the custom application traffic to DSCP EF instead.

Question 4

Which three match statements are valid in Cisco IOS XR Software? (Choose three.)

A. match mpls experimental topmost
B. match flow
C. match port-type
D. match field
E. match vpls
F. match qos-group

Question 5

Refer to the exhibit.

You have implemented RFC 3270 Short Pipe mode in your MPLS network. A customer packet with the DSCP value of AF31 has been sent to the ingress PE router. The PE router has set the MPLS experimental bits per policy, but the policer has remarked the experimental bits of the top label. What will the DSCP value of the packet be when it leaves the egress PE router?

A. AF31
B. CS1
C. CS3
D. CS4
E. BE

Solutions: