Exam Name: Maintaining Cisco Service Provider Quality of Service (MSPQS)
Certification Provider: Cisco
Corresponding Certification: CCNP SP Operations
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Cisco 642-785 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Policing and Shaping | - Traffic shaping mechanisms and use cases - Traffic policing concepts and configuration |
| QoS Fundamentals | - QoS models (Best Effort, IntServ, DiffServ) - Traffic characteristics and service requirements |
| QoS Classification and Marking | - Marking techniques (DSCP, CoS, IP Precedence) - Packet classification methods (ACLs, NBAR) |
| Congestion Management and Avoidance | - Queuing mechanisms (LLQ, CBWFQ) - Congestion avoidance (WRED) |
| QoS Troubleshooting and Monitoring | - Verification tools and commands - Identifying QoS misconfiguration issues |
| Service Provider QoS Implementation | - MQC (Modular QoS CLI) framework - MPLS QoS and DiffServ tunneling |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
Refer to the exhibit.
A provider uses the recommended mappings for DSCP to MPLS EXP. Several sites connected to the same PE router report that critical data has been experiencing a high number of drops. The customer marks its CRITICAL data as AF31. What appears to be the problem?
- A. The provider is using the recommended mappings for DSCP to MPLS EXP, so the CLASS-MAP for the CRITICAL-DATA should contain EXP value of 4.
- B. If the data receiving drops is high priority, it should be marked with MPLS EXP value 7.
- C. The recommended mapping for AF31 is to MPLS EXP 5, which is classified in the REALTIME class, not the CRITICAL DATA class.
- D. The classification for CRITICAL-DATA should contain a match-all, not a match-any.
- E. The allocated bandwidth for CRITICAL-DATA should be increased to provide sufficient bandwidth to support the application.
Correct Answer: A 🗳️
Which are the two locations where the SP network device always trusts the QoS markings from its upstream neighbor? (Choose two.)
- A. at the ingress CE
- B. at the egress PE
- C. in the SP core
- D. at the egress CE
- E. at the ingress PE
Correct Answer: B,C 🗳️
Which of these correctly describes traffic classification using qos-group?
- A. qos-group is only applicable to an MPLS-enabled router.
- B. qos-group is local to the router.
- C. qos-group marking is automatically mapped to MPLS EXP marking.
- D. qos-group marking value ranges from 0 to 7.
Correct Answer: B 🗳️
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 default queue size.
- C. Traffic shaping is applied to the voice traffic class.
- D. WRED is not configured for the voice traffic class.
- E. The voice traffic class is using the priority command.
Correct Answer: C 🗳️
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 traffic shaping to smooth out the peaks and troughs.
- C. Decrease the size of output queues in the network to allow the scheduler to allocate link bandwidth fairly.
- D. Implement WRED to help prevent tail drops during periods of congestion.
Correct Answer: D 🗳️
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