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Cisco 642-785 Exam Syllabus Topics:

SectionWeightObjectives
QoS in MPLS and Service Provider Environments15%- End-to-end QoS across MPLS networks
- QoS for Layer 2 and Layer 3 VPN services
- SLAs and QoS policy maintenance
Queuing and Scheduling Mechanisms25%- Class-Based Weighted Fair Queuing (CBWFQ)
- Low Latency Queuing (LLQ)
- Modular QoS CLI (MQC) implementation
Monitoring and Troubleshooting QoS20%- Analyzing queuing and congestion problems
- Troubleshooting classification and marking issues
- Verifying QoS policies on IOS and IOS XR
QoS Fundamentals in Service Provider Networks20%- Classification and marking mechanisms
- Quality of Service models and architectures
- DiffServ, IntServ, and MPLS QoS integration
Traffic Policing and Shaping20%- 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.
Reveal Solution  Discussion  0

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
Reveal Solution  Discussion  0

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
Reveal Solution  Discussion  0

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
Reveal Solution  Discussion  0

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.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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