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Cisco 642-785 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Monitoring and Troubleshooting QoS | 20% | - Troubleshooting classification and marking issues - Verifying QoS policies on IOS and IOS XR - Analyzing queuing and congestion problems |
| Topic 2: Traffic Policing and Shaping | 20% | - Policing concepts and configuration - Shaping mechanisms and operation - Congestion management and avoidance |
| Topic 3: QoS Fundamentals in Service Provider Networks | 20% | - DiffServ, IntServ, and MPLS QoS integration - Quality of Service models and architectures - Classification and marking mechanisms |
| Topic 4: Queuing and Scheduling Mechanisms | 25% | - Low Latency Queuing (LLQ) - Class-Based Weighted Fair Queuing (CBWFQ) - Modular QoS CLI (MQC) implementation |
| Topic 5: QoS in MPLS and Service Provider Environments | 15% | - End-to-end QoS across MPLS networks - SLAs and QoS policy maintenance - QoS for Layer 2 and Layer 3 VPN services |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
A service provider will apply this policy at which of these interfaces?
interface Gi1/1 service-policy output SP-POLICY ! policy-map SP-POLICY class TRAFFIC-CLASS-1 police rate percent 20 conform-action transmit exceed-action drop priority ! class TRAFFIC-CLASS-2 bandwidth percent 50 queue-limit 800 ms random-detect exp 3 280 ms 490 ms ! class class-default queue-limit 500 ms random-detect exp 1 200 ms 350 ms random-detect exp 0 100 ms 200 ms ! end-policy-map ! class-map match-any TRAFFIC-CLASS-1 match dscp ipv4 45 ef cs6 match mpls experimental topmost 5 6 end-class-map ! class-map match-any TRAFFIC-CLASS-2 match dscp ipv4 cs2 af21 af23 af31 af32 af33 35 37 match mpls experimental topmost 3 end-class-map !
- A. CE interface toward PE
- B. PE interface toward P
- C. P interface toward PE
- D. PE interface toward CE
Correct Answer: B 🗳️
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. Increase the bandwidth of the voice priority queue.
- C. Lower the total bandwidth allocated for the video, critical, and class-default queues, because they are starving the voice queue.
- D. Set up WRED to help avoid link congestion.
Correct Answer: A 🗳️
Within a QoS policy-map configuration, one of the traffic classes is configured with the random-detect dscp-based configuration command. What will that command accomplish?
- A. decreases congestion by avoiding global UDP synchronization
- B. provides congestion management by queueing the traffic using CBWFQ
- C. provides congestion management by queueing the traffic using LLQ
- D. provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority
- E. decreases the probability of congestion by selectively dropping TCP packets before the queue is full
Correct Answer: E 🗳️
Refer to the exhibit.
A customer has commented that voice quality is not meeting expectations when calls cross your network. This voice packet was captured from the egress link to the customer. This capture is representative of the customer's voice packets across your network and the queuing method shown is representative of packet treatment across your network. How might the problem be corrected?
- A. Increase the bandwidth for the voice class.
- B. Set up multiple priority queues to ensure low latency for voice packets.
- C. Enable WRED in the CBWFQs to minimize the possibility of dropping voice packets.
- D. Ensure that voice packets are correctly marked when they traverse your network.
Correct Answer: D 🗳️
You have deployed IP SLA in your network to monitor VoIP. You want to be notified on network delay before it affects voice quality. What threshold should be set?
- A. 50 ms round trip
- B. 150 ms one-way
- C. 200 ms round trip
- D. 150 ms round trip
- E. 250 ms one-way
Correct Answer: B 🗳️
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