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

1. A customer reports that during peak hours, FTP performance is unacceptable. Currently, the service provider maps the customer FTP traffic into the class-default traffic class and FTP traffic is marked with MPLS EXP1. The class-default class traffic is configured with MPLS EXP based WRED and also with the bandwidth command. What could be causing the FTP performance issues with the customer?

A) The FTP-type bulk traffic should be mapped to MPLS EXP 5 instead of MPLS EXP 1. The improper marking of FTP packets is causing CBWFQ to assign lower priority for FTP packets within the class-default traffic class.
B) The bandwidth command is causing the FTP issues. It is generally not recommended to use CBWFQ for the class-default traffic class.
C) FTP packets are being more randomly dropped that the other TCP traffic within the class-default traffic class, because the WRED thresholds for MPLS EXP 3 marked packets were configured to improper values.
D) The service provider is using LLQ on all the core links, but the FTP traffic is not is assigned to the priority queue.

2. A customer reports drops for traffic in the BIZ-CRITICAL class. As part of the verification process you identify that there is a high number of random drops. Which of these can help address this problem?

A) Decrease the queue limit for the traffic class.
B) Enable fair queuing for the BIZ-CRITICAL class.
C) Increase the WRED min threshold value for the traffic class.
D) Decrease the WRED drop probability denominator for the class.

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

A) NetFlow
B) RMON
C) TFTP
D) SYSLOG
E) SNMP

4. Refer to the exhibit.

The service provider uses a three-class service provider QoS model (real-time, critical, best effort). The provider receives reports from a customer about poor quality on their multimedia conferences. The provider recently updated their profiles to include multimedia conferencing (af41) to their real-time class, which includes voice (ef). What are the two most likely causes of this problem? (Choose two.)

A) The SP-CRITICAL-DATA class should not use random detect for multimedia traffic.
B) The class map for SP-REALTIME does not include the DSCP values for multimedia conferences and voice traffic.
C) The MPLS experimental 3 is in the SP-CRITICAL-DATA class, not the SP_REALTIME class.
D) The SP-REALTIME class should include mpls experimental 4, not 5.
E) Multimedia conferencing is included in the SP-CRITICAL-DATA class.

5. Refer to the exhibit.

A customer has commented that voice quality is not meeting expectations when calls cross your network. This voice packet was captured from the egress link to the customer. This capture is representative of the customer's voice packets across your network and the queuing method shown is representative of packet treatment across your network. How might the problem be corrected?

A) Enable WRED in the CBWFQs to minimize the possibility of dropping voice packets.
B) Set up multiple priority queues to ensure low latency for voice packets.
C) Increase the bandwidth for the voice class.
D) Ensure that voice packets are correctly marked when they traverse your network.

Solutions: