Maintaining Cisco Service Provider Quality of Service (MSPQS) (642-785) Free Practice Test

Question 1

What are the benefits of using differentiated services in the service provider backbone? (Choose two.)

A. more aggregate traffic supported

B. less bandwidth required to achieve the same SLA

C. overprovision by two times the maximum aggregate

D. simple, easy to design, deploy, and operate

Correct Answer: A,B

Question 2

Refer to the exhibit.

A provider uses the recommended mappings for DSCP to MPLS EXP. Several sites connected to the same PE router report that critical data has been experiencing a high number of drops. The customer marks its CRITICAL data as AF31. What appears to be the problem?

A. The provider is using the recommended mappings for DSCP to MPLS EXP, so the CLASS-MAP for the CRITICAL-DATA should contain EXP value of 4.

B. If the data receiving drops is high priority, it should be marked with MPLS EXP value 7.

C. The classification for CRITICAL-DATA should contain a match-all, not a match-any.

D. The allocated bandwidth for CRITICAL-DATA should be increased to provide sufficient bandwidth to support the application.

E. The recommended mapping for AF31 is to MPLS EXP 5, which is classified in the REALTIME class, not the CRITICAL DATA class.

Correct Answer: A

Question 3

You have deployed IP SLA in your network to monitor VoIP. You want to be notified on network delay before it affects voice quality. What threshold should be set?

A. 150 ms one-way

B. 150 ms round trip

C. 250 ms one-way

D. 50 ms round trip

E. 200 ms round trip

Correct Answer: A

Question 4

Which two methods can be used to monitor QoS performance? (Choose two.)

A. SNMP

B. SYSLOG

C. NetFlow

D. RMON

E. TFTP

Correct Answer: A,C

Question 5

Where would you apply WRED to avoid congestion and poor QoS from oversubscription of the network?

A. wherever there is a potential bottleneck and most traffic is TCP

B. wherever there is a potential bottleneck and most traffic is UDP

C. wherever there is a potential bottleneck and traffic is delay-intolerant

D. wherever there is a potential bottleneck

E. wherever there is a potential bottleneck and most traffic is voice

Correct Answer: A

Question 6

An MPLS VPN customer with managed CE services recently made some changes to their call manager configurations. Now the customer reports that their VoIP traffic voice quality is very poor. What could be a cause of the problem?

A. RTP header compression is used for the VoIP traffic class.

B. The VoIP traffic is being marked as DSCP EF.

C. The traffic shaping rate for the VoIP traffic class is too low.

D. The customer changed the codec used for voice compression from G.729 to G.711.

E. The VoIP traffic class is not being policed at the CE router egress.

Correct Answer: D

Question 7

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

A. match flow

B. match vpls

C. match qos-group

D. match mpls experimental topmost

E. match port-type

F. match field

Correct Answer: B,C,D

Question 8

DRAG DROP
Drag and drop mechanisms on the left to their corresponding uses on the right. Some mechanisms may not used.

Correct Answer:

Question 9

When the RFC 3270 Pipe mode is used, the PHB at the egress router is based on which of these?

A. The topmost MPLS label EXP value.

B. The Differentiated Services field value in the IP packet header.

C. The MPLS VPN label EXP value.

D. The packet is re-evaluated, remarked, and the PHB is based on this new marking.

Correct Answer: A

Question 10

You work for service provider that employs a four-class service provider QoS model (best effort, bronze, silver, gold). A customer recently reported an issue with high drop rate on a mission-critical database application in the silver class. The silver class is currently at capacity. The gold class is currently only used for voice and video conferencing, and has available bandwidth. The application was remapped to the gold class. Which statements are valid alternative options to this decision? (Choose two.)

A. Moving to a three-class QoS model would allow for more bandwidth per class and would reduce the support of maintaining multiple classes.

B. In addition to the remapping, the provider would have to change the queue model from WFQ to priority queued.

C. The provider should consider moving to a six-class QoS model to provide more available classes of service to differentiate traffic.

D. Additional bandwidth should have been added to the silver class from one of the lower classes before the traffic class was moved.

Correct Answer: C,D

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Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) (642-785) Free Practice Test