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Cisco 642-785 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| 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 |
| Queuing and Scheduling Mechanisms | 25% | - Class-Based Weighted Fair Queuing (CBWFQ) - Low Latency Queuing (LLQ) - Modular QoS CLI (MQC) implementation |
| Monitoring and Troubleshooting QoS | 20% | - Analyzing queuing and congestion problems - Troubleshooting classification and marking issues - Verifying QoS policies on IOS and IOS XR |
| QoS Fundamentals in Service Provider Networks | 20% | - Classification and marking mechanisms - Quality of Service models and architectures - DiffServ, IntServ, and MPLS QoS integration |
| Traffic Policing and Shaping | 20% | - Shaping mechanisms and operation - Policing concepts and configuration - Congestion management and avoidance |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
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 allocated bandwidth for CRITICAL-DATA should be increased to provide sufficient bandwidth to support the application.
- B. The recommended mapping for AF31 is to MPLS EXP 5, which is classified in the REALTIME class, not the CRITICAL DATA class.
- C. If the data receiving drops is high priority, it should be marked with MPLS EXP value 7.
- D. The classification for CRITICAL-DATA should contain a match-all, not a match-any.
- E. 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.
Correct Answer: E 🗳️
Which two items can be obtained from the CISCO-NETFLOW-MIB? (Choose two.)
- A. CEF tables
- B. cache configuration
- C. protocol statistics
- D. signal-to-noise ratio
- E. buffer hits
Correct Answer: B,C 🗳️
Which three match statements are valid in Cisco IOS XR Software? (Choose three.)
- A. match qos-group
- B. match port-type
- C. match mpls experimental topmost
- D. match vpls
- E. match field
- F. match flow
Correct Answer: A,C,D 🗳️
When the customer LAN is managed by the service provider and the network is oversubscribed, what is the best location for use of congestion avoidance mechanisms?
- A. in the service provider core
- B. on output interfaces from the service provider network leading to the customer LAN
- C. on output interfaces from the customer LAN leading into the service provider network
- D. in interfaces in the service provider network incoming from the customer LAN
Correct Answer: C 🗳️
Refer to the exhibit.
Which statement is correct?
- A. Packets marked with both DSCP EF and MPLS EXP 5 markings will not be classified into the SP-REALTIME traffic class.
- B. A total of 133836 packets have been transmitted out of the FastEthernet0/0 interface.
- C. No traffic matched the SP-REALTIME class.
- D. The FastEthernet0/0 interface is using CBWFQ egress queueing.
- E. This policy map is applied to the FastEthernet0/0 interface in the input direction.
Correct Answer: B 🗳️
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