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Cisco 642-785 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: QoS Fundamentals in Service Provider Networks | 20% | - Classification and marking mechanisms - Quality of Service models and architectures - DiffServ, IntServ, and MPLS QoS integration |
| Topic 2: Queuing and Scheduling Mechanisms | 25% | - Class-Based Weighted Fair Queuing (CBWFQ) - Low Latency Queuing (LLQ) - Modular QoS CLI (MQC) implementation |
| Topic 3: Traffic Policing and Shaping | 20% | - Shaping mechanisms and operation - Congestion management and avoidance - Policing concepts and configuration |
| Topic 4: Monitoring and Troubleshooting QoS | 20% | - Verifying QoS policies on IOS and IOS XR - Troubleshooting classification and marking issues - Analyzing queuing and congestion problems |
| Topic 5: QoS in MPLS and Service Provider Environments | 15% | - End-to-end QoS across MPLS networks - QoS for Layer 2 and Layer 3 VPN services - SLAs and QoS policy maintenance |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
The provider you work for supports a wide range of Cisco router models and Cisco IOS Software releases. You are in the process of moving to a SNMP-based tool to monitor QoS configurations and statistics. What are some of the challenges to this approach?
- A. The SNMP MIB provides direct access into the QoS configuration parameters. Poor configuration could lead to changes that are difficult to track.
- B. Older versions of Cisco IOS Software do not maintain index persistency, which results in significant changes in the information that is collected unless properly configured.
- C. SNMP should be used in conjunction only with Cisco IP SLA to ensure that the information gathered is reported properly.
- D. Some models of Cisco routers do not have full support for the class-based QoS MIB, which results in a number of elements that cannot be managed.
Correct Answer: B 🗳️
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. Decrease the size of output queues in the network to allow the scheduler to allocate link bandwidth fairly.
- B. Implement WRED to help prevent tail drops during periods of congestion.
- C. Implement traffic shaping to smooth out the peaks and troughs.
- D. Change your QoS model from DiffServ to IntServ for better QoS scalability.
Correct Answer: B 🗳️
When is a best-effort QoS policy most appropriate?
- A. when the customer has high bandwidth access to the network
- B. when the customer will only transport delay-tolerant data
- C. when the CE is self-managed and the customer provides adequate QoS marking
- D. when the customer plans to transport data from no more than one multimedia application
Correct Answer: B 🗳️
What are two benefits of the DiffServ model? (Choose two.)
- A. It provides absolute guarantees of service quality.
- B. It does not require setting up an end-to-end signaling mechanism.
- C. Service quality can be tailored to the needs of many different types of traffic.
- D. Its class-based mechanisms are simple and scale well.
Correct Answer: B,C 🗳️
Refer to the exhibit.
The voice traffic is not receiving the appropriate per-hop behavior at the egress of the CEPE link. What is the problem?
- A. Instead of hard coding the actual bandwidth on the priority and bandwidth commands, the percent option should be used.
- B. Both ACLs are misconfigured.
- C. Both class maps are misconfigured.
- D. The control traffic class should be configured with the priority command instead of the bandwidth command.
Correct Answer: C 🗳️
