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Cisco 642-785 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Service Provider QoS Implementation | - MQC (Modular QoS CLI) framework - MPLS QoS and DiffServ tunneling |
| Congestion Management and Avoidance | - Congestion avoidance (WRED) - Queuing mechanisms (LLQ, CBWFQ) |
| QoS Classification and Marking | - Packet classification methods (ACLs, NBAR) - Marking techniques (DSCP, CoS, IP Precedence) |
| QoS Troubleshooting and Monitoring | - Identifying QoS misconfiguration issues - Verification tools and commands |
| QoS Fundamentals | - Traffic characteristics and service requirements - QoS models (Best Effort, IntServ, DiffServ) |
| Policing and Shaping | - Traffic shaping mechanisms and use cases - Traffic policing concepts and configuration |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
When the RFC 3270 Uniform mode is used, the PHB at the egress router is based on which of these?
- A. The Differentiated Services field value in the IP packet header.
- B. The topmost MPLS label EXP value.
- C. The packet is re-evaluated, remarked, and the PHB is based on this new marking.
- D. The MPLS VPN label EXP value.
Correct Answer: B 🗳️
When troubleshooting a QoS problem, which two key statistics should you look for? (Choose two.)
- A. interface utilization
- B. queue utilization
- C. queue priority
- D. queue drops
- E. queue depth
Correct Answer: D,E 🗳️
Refer to the exhibit. Voice quality is poor on calls placed between the two sites. What change would you
recommend to solve this problem?
- A. Change the voice class map to match DSCP EF or CS5.
- B. Set up WRED to help avoid link congestion.
- C. Lower the total bandwidth allocated for the video, critical, and class-default queues, because they are starving the voice queue.
- D. Increase the bandwidth of the voice priority queue.
Correct Answer: A 🗳️
You work for service provider that employs a four-class service provider QoS model (best effort, bronze, silver, gold). A customer recently reported an issue with high drop rate on a mission-critical database application in the silver class. The silver class is currently at capacity. The gold class is currently only used for voice and video conferencing, and has available bandwidth. The application was remapped to the gold class. Which statements are valid alternative options to this decision? (Choose two.)
- A. Moving to a three-class QoS model would allow for more bandwidth per class and would reduce the support of maintaining multiple classes.
- B. The provider should consider moving to a six-class QoS model to provide more available classes of service to differentiate traffic.
- C. Additional bandwidth should have been added to the silver class from one of the lower classes before the traffic class was moved.
- D. In addition to the remapping, the provider would have to change the queue model from WFQ to priority queued.
Correct Answer: B,C 🗳️
Refer to the exhibit.
A customer reports that data between their sites across your network is very slow and that
voice and video quality are unacceptable. Packet traces of data coming in from and going out to the customer confirm that many packets are being dropped in your network, and many of those that are not dropped are being remarked to CS1. Class maps and a policy map configured as shown are applied inbound to the Fast Ethernet interfaces that connect the customer. What could be the problem?
- A. The match criteria is DSCP and the customer packets are being sent marked using IP precedence.
- B. The CIR and PIR values appear to have been configured using kbps when the entries are bps.
- C. The customer data is being rate limited, but is not being queued by class, which is causing tail drops and packet remarking.
- D. All traffic is matching the class class-default, because all other classes are match-all with multiple match criteria.
Correct Answer: B 🗳️
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