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Cisco 642-785 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Queuing and Scheduling Mechanisms | 25% | - Low Latency Queuing (LLQ) - Class-Based Weighted Fair Queuing (CBWFQ) - Modular QoS CLI (MQC) implementation |
| Topic 2: Monitoring and Troubleshooting QoS | 20% | - Analyzing queuing and congestion problems - Verifying QoS policies on IOS and IOS XR - Troubleshooting classification and marking issues |
| Topic 3: QoS Fundamentals in Service Provider Networks | 20% | - DiffServ, IntServ, and MPLS QoS integration - Classification and marking mechanisms - Quality of Service models and architectures |
| Topic 4: Traffic Policing and Shaping | 20% | - Policing concepts and configuration - Shaping mechanisms and operation - Congestion management and avoidance |
| Topic 5: QoS in MPLS and Service Provider Environments | 15% | - SLAs and QoS policy maintenance - End-to-end QoS across MPLS networks - QoS for Layer 2 and Layer 3 VPN services |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
1. When troubleshooting a QoS problem, which two key statistics should you look for? (Choose two.)
A) queue priority
B) queue utilization
C) interface utilization
D) queue drops
E) queue depth
2. 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) Both ACLs are misconfigured.
B) Both class maps are misconfigured.
C) Instead of hard coding the actual bandwidth on the priority and bandwidth commands, the percent option should be used.
D) The control traffic class should be configured with the priority command instead of the bandwidth command.
3. 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) SNMP should be used in conjunction only with Cisco IP SLA to ensure that the information gathered is reported properly.
B) 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.
C) The SNMP MIB provides direct access into the QoS configuration parameters. Poor configuration could lead to changes that are difficult to track.
D) 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.
4. To classify and prioritize traffic according to importance, which three statements are correct? (Choose three.)
A) Email should be placed in a best-effort class.
B) Voice traffic should be given top priority.
C) Video should be placed in the same class as voice.
D) Critical applications should be given sufficient bandwidth to meet their requirements.
E) Each class should be guaranteed at least some bandwidth.
5. Which Cisco IOS IP SLA Probe would you select to identify bottlenecks in the network?
A) FTP Path Echo
B) ICMP Path Echo
C) ICMP Path Jitter
D) ICMP Echo
Solutions:
| Question # 1 Answer: D,E | Question # 2 Answer: B | Question # 3 Answer: D | Question # 4 Answer: A,B,D | Question # 5 Answer: B |
