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Cisco 642-785 Exam Syllabus Topics:

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

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

2. Which statement about the MQC configuration shown here for the class-default traffic class is true?
policy-map CE-EDGE-4CLASS-OC3-POS-1
class class-default
bandwidth percent 25
!

A) The maximum number of packets the queue for the class-default class can hold is 64 packets using the default queue-limit.
B) The class-default class will use WFQ instead of FIFO queueing.
C) The bandwidth percent is referenced to the reserved bandwidth on the interface.
D) This configuration is invalid, because the class-default traffic class does not support the bandwidth command.

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

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

5. Which two match statements are correct in Cisco IOS Software? (Choose two.)

A) class-map class1 match not protocol ip
B) class-map class3 match dscp af31 match dscp af41
C) class-map match-none class2 match protocol ip
D) class-map match-any class3 match dscp af31 match dscp af41

Solutions: