Cisco : 642-785 Questions & Answers
Updated: Jun 15, 2026
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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) The voice traffic class is using the priority command.
B) Traffic shaping is applied to the voice traffic class.
C) The voice packets are marked as DSCP EF.
D) WRED is not configured for the voice traffic class.
E) The voice traffic class is using the default queue size.
2. A service provider recently changed from RFC 3270 Uniform mode to Pipe mode. Which three considerations about this change are true? (Choose three.)
A) In Uniform mode, when the topmost EXP value is changed, the changed EXP value will propagate to the original IP precedence or DSCP.
B) If the provider moved to a Short Pipe mode model, it would allow them to implement customer-specific QoS policy on the PE egress.
C) The Short Pipe mode derives the outbound classification of the WRED and WFQ based on the DiffServ policy of the provider.
D) The Pipe mode provides the isolation between the customer and provider DiffServ domains, while maintaining a simpler support model.
3. Which two Cisco IOS commands can be used to monitor QoS on a device? (Choose two.)
A) show qos-interface
B) show service-policy
C) show policy-map
D) show class-map
E) show qos-maps
F) show qos-dbl
4. 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) AF31
D) CS4
E) CS1
5. 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) PE interface was not configured with enough bandwidth.
B) PE needs to upgrade to a higher throughput interface.
C) CE marked all traffic incorrectly to DSCP 46.
D) Traffic rate CE sent is over the SLA limit.
E) CE marked all traffic incorrectly to DSCP 0.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A,B,D | Question # 3 Answer: C,D | Question # 4 Answer: C | Question # 5 Answer: C |
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