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Cisco 642-785 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Congestion Management and Avoidance | - Queuing mechanisms (LLQ, CBWFQ) - Congestion avoidance (WRED) |
| Topic 2: Policing and Shaping | - Traffic shaping mechanisms and use cases - Traffic policing concepts and configuration |
| Topic 3: QoS Troubleshooting and Monitoring | - Identifying QoS misconfiguration issues - Verification tools and commands |
| Topic 4: QoS Classification and Marking | - Packet classification methods (ACLs, NBAR) - Marking techniques (DSCP, CoS, IP Precedence) |
| Topic 5: QoS Fundamentals | - Traffic characteristics and service requirements - QoS models (Best Effort, IntServ, DiffServ) |
| Topic 6: 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:
1. 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) Enable WRED in the CBWFQs to minimize the possibility of dropping voice packets.
C) Ensure that voice packets are correctly marked when they traverse your network.
D) Set up multiple priority queues to ensure low latency for voice packets.
2. Refer to the exhibit.
Which two statements are correct? (Choose two.)
A) Within the cust1-classes policy, the gold class is guaranteed 50 percent of the bandwidth. Silver is guaranteed 20 percent of the bandwidth, and bronze is guaranteed 15 percent of the bandwidth.
B) The traffic class cust2 is ensured a bandwidth of 51.2 kb/s.
C) The policy map cust-policy specifies an average traffic shaping rate of 384 kb/s for the cust1 class and assigns the service policy cust1-classes to the cust1 class.
D) This example queues the traffic into different CBWFQ classes before the aggregate traffic is shaped.
E) This example is a hierarchical MQC example, and the cust-policy is the child policy.
F) Within the cust2-classes policy, the gold class is guaranteed 30 percent of the S3/2 interface bandwidth. Silver is guaranteed 15 percent of the S3/2 interface bandwidth. Bronze is guaranteed 10 percent of the S3/2 interface bandwidth.
3. 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) Implement traffic shaping to smooth out the peaks and troughs.
B) Change your QoS model from DiffServ to IntServ for better QoS scalability.
C) Implement WRED to help prevent tail drops during periods of congestion.
D) Decrease the size of output queues in the network to allow the scheduler to allocate link bandwidth fairly.
4. Where do service providers apply policy when traffic is leaving the customer network? (Choose two.)
A) Apply input policy on the CE interface toward PE, if CE is unmanaged.
B) Apply output policy on the PE interface toward CE, if CE is managed.
C) Apply output policy on the CE interface toward PE, if CE is managed.
D) Apply input policy on the PE interface toward CE, if CE is unmanaged.
E) Apply input policy on the PE interface toward CE, if CE is managed.
5. Refer to the exhibit.
Which two statements are correct? (Choose two.)
A) The BULK-DATA traffic class is missing the match-any option in the class-map command.
B) AF11 or AF12 or AF13 marked packets will be matched to the BULK-DATA traffic class.
C) No traffic can be matched to the REALTIME traffic class.
D) No traffic can be matched to the VoIP traffic class.
E) No traffic can be matched to the BULK-DATA traffic class.
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A,C | Question # 3 Answer: C | Question # 4 Answer: C,D | Question # 5 Answer: B,C |
