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Cisco 642-785 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Monitoring and Troubleshooting QoS | - QoS statistics and verification - IP SLA and performance measurement |
| Topic 2: Congestion Management and Avoidance | - WRED configuration and behavior - WFQ, CBWFQ and Priority Queuing |
| Topic 3: Service Provider QoS Implementation | - Policy maps and class maps - Implementing QoS on Cisco IOS routers |
| Topic 4: Quality of Service Fundamentals | - Service Provider QoS models and design - Traffic classification and marking |
| Topic 5: QoS Mechanisms in MPLS Networks | - RFC 3270 Uniform and Pipe modes - EXP and DSCP mapping |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
1. Refer to the exhibit.
A provider uses the recommended mappings for DSCP to MPLS EXP. Several sites connected to the same PE router report that critical data has been experiencing a high number of drops. The customer marks its CRITICAL data as AF31. What appears to be the problem?
A) The provider is using the recommended mappings for DSCP to MPLS EXP, so the CLASS-MAP for the CRITICAL-DATA should contain EXP value of 4.
B) If the data receiving drops is high priority, it should be marked with MPLS EXP value 7.
C) The classification for CRITICAL-DATA should contain a match-all, not a match-any.
D) The recommended mapping for AF31 is to MPLS EXP 5, which is classified in the REALTIME class, not the CRITICAL DATA class.
E) The allocated bandwidth for CRITICAL-DATA should be increased to provide sufficient bandwidth to support the application.
2. An MPLS VPN customer reports that their DSCP markings from one CE to another CE are being remarked by the service provider. What can cause customer packets to be remarked?
A) The service provider is using Pipe mode as the MPLS QoS tunnel mode.
B) The service provider is using Uniform mode as the MPLS QoS tunnel mode.
C) The MPLS VPN service provider is using Penultimate Hop Popping.
D) The service provider is using the Short Pipe mode as the MPLS QoS tunnel mode.
3. DRAG DROP
Drag and drop mechanisms on the left to their corresponding uses on the right. Some mechanisms may not used.
4. What would be the first step when defining an MQC?
A) Add one or more match commands to classify packets.
B) Apply the commands such as bandwidth, police, and set dscp to enable the QoS feature.
C) Define a traffic class by using the class-map command.
D) Create a traffic policy by using the policy-map command.
E) Attach the traffic policy (policy map) to the interface by using the service-policy command.
5. A service provider recently changed from RFC 3270 Uniform mode to Pipe mode. Which three considerations about this change are true? (Choose three.)
A) The Pipe mode provides the isolation between the customer and provider DiffServ domains, while maintaining a simpler support model.
B) The Short Pipe mode derives the outbound classification of the WRED and WFQ based on the DiffServ policy of the provider.
C) In Uniform mode, when the topmost EXP value is changed, the changed EXP value will propagate to the original IP precedence or DSCP.
D) If the provider moved to a Short Pipe mode model, it would allow them to implement customer-specific QoS policy on the PE egress.
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B | Question # 3 Answer: Only visible for members | Question # 4 Answer: C | Question # 5 Answer: A,C,D |


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