Cisco 642-785 : Maintaining Cisco Service Provider Quality of Service (MSPQS)

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

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

2. 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) BE
B) CS3
C) CS4
D) CS1
E) AF31

3. Which three items are important when monitoring service quality in the SP network? (Choose three.)

A) Troubleshooting class map configurations is complex and frequently required.
B) Establishing alarm thresholds for QoS problems can be complicated.
C) QoS support differs from device to device, depending on underlying hardware platforms and software.
D) QoS issues can be difficult to detect when there is not enough traffic to trigger the configured QoS policy.
E) Collection of data to detect QoS issues is slow and labor-intensive.
F) The typical cause of QoS issues is intermittent failure of network devices and these are inherently difficult to detect.

4. 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) 250 ms one-way
C) 150 ms round trip
D) 200 ms round trip
E) 50 ms round trip

5. An MPLS VPN customer reports that the VoIP voice quality is very bad for calls across the
MPLS VPN. What could be the problem?

A) The voice packets are marked as DSCP EF.
B) The voice traffic class is using the priority command.
C) The voice traffic class is using the default queue size.
D) Traffic shaping is applied to the voice traffic class.
E) WRED is not configured for the voice traffic class.

Solutions: