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Cisco 642-785 Exam Syllabus Topics:

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

Question 1

When the customer LAN is managed by the service provider and the network is oversubscribed, what is the best location for use of congestion avoidance mechanisms?

A. on output interfaces from the customer LAN leading into the service provider network
B. in the service provider core
C. on output interfaces from the service provider network leading to the customer LAN
D. in interfaces in the service provider network incoming from the customer LAN

Question 2

Which statement about the rates and statistics (such as match, transmit, drop, and police) shown in the show policy-map interface output is true?

A. The matched statistics of the packet can be cleared only when the router reboots.
B. The matched statistics of the packet are displayed in real time.
C. The rates are displayed in real time, which matches the actual traffic rate.
D. The rates are computed as a moving average of instantaneous rates.
E. The traffic policing statistics are displayed in real time.

Question 3

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. The VoIP traffic class is not being policed at the CE router egress.
B. The customer changed the codec used for voice compression from G.729 to G.711.
C. The VoIP traffic is being marked as DSCP EF.
D. RTP header compression is used for the VoIP traffic class.
E. The traffic shaping rate for the VoIP traffic class is too low.

Question 4

Refer to the exhibit.

Some customers report that at peak times during the day their average throughput seems to be less than what they expect. While troubleshooting, you notice that data flows sometimes seem to be synchronized with a tendency to increase then drop off in a repeating manner. Which action would help to alleviate this situation?

A. Implement traffic shaping to smooth out the peaks and troughs.
B. Implement WRED to help prevent tail drops during periods of congestion.
C. Change your QoS model from DiffServ to IntServ for better QoS scalability.
D. Decrease the size of output queues in the network to allow the scheduler to allocate link bandwidth fairly.

Question 5

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

Solutions: