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

1. Refer to the exhibit on a PE router. What could be causing the issue?
Service-policy output: OUTPUT-POLICY Counters last updated 00:00:00 ago
Class-map: REALTIME (match-any) 845206 packets, 348763573 bytes 30 second offered rate 3000000 bps, drop rate 2500000 bps Match: ip dscp cs5 (40) ef (46) Priority: 10% (500 kbps), burst bytes 327265678, b/w exceed drops: 312925450
Class-map: DSCP-OUT-RTVI (match-any) 0 packets, 0 bytes 30 second offered rate 0000 bps, drop rate 0000 bps Match: ip dscp af41 (0) Queueing queue limit 32 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0
Class-map: class-default (match-any) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: any Queueing queue limit 1024 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0

A) Traffic rate CE sent is over the SLA limit.
B) CE marked all traffic incorrectly to DSCP 0.
C) PE needs to upgrade to a higher throughput interface.
D) PE interface was not configured with enough bandwidth.
E) CE marked all traffic incorrectly to DSCP 46.

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

3. When troubleshooting a QoS problem, which two key statistics should you look for? (Choose two.)

A) queue depth
B) interface utilization
C) queue drops
D) queue priority
E) queue utilization

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

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

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

Solutions: