- Exam Code: 642-785
- Exam Name: Maintaining Cisco Service Provider Quality of Service (MSPQS)
- Updated: Sep 11, 2026
- Q & A: 91 Questions and Answers
Cisco 642-785 Exam : Maintaining Cisco Service Provider Quality of Service (MSPQS)
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Cisco 642-785 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Monitoring and Troubleshooting QoS | - QoS statistics and verification - IP SLA and performance measurement |
| Congestion Management and Avoidance | - WRED configuration and behavior - WFQ, CBWFQ and Priority Queuing |
| Quality of Service Fundamentals | - Traffic classification and marking - Service Provider QoS models and design |
| Service Provider QoS Implementation | - Policy maps and class maps - Implementing QoS on Cisco IOS routers |
| 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:
Question #1
Which is the preferred queuing method provided by Cisco IOS Software for a converged VoIP network?
- A. LLQ
- B. WFQ
- C. CBWFQ
- D. FIFO
Correct Answer: A 🗳️
Question #2
What are the three primary types of faults associated with QoS fault management? (Choose three.)
- A. physical faults
- B. buffer faults
- C. classification faults
- D. assurance faults
- E. marking faults
- F. queue faults
Correct Answer: C,D,E 🗳️
Question #3
Within a QoS policy-map configuration, one of the traffic classes is configured with the random-detect dscp-based configuration command. What will that command accomplish?
- A. provides congestion management by queueing the traffic using CBWFQ
- B. provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority
- C. decreases congestion by avoiding global UDP synchronization
- D. provides congestion management by queueing the traffic using LLQ
- E. decreases the probability of congestion by selectively dropping TCP packets before the queue is full
Correct Answer: E 🗳️
Question #4
When the RFC 3270 Uniform mode is used, the PHB at the egress router is based on which of these?
- A. The MPLS VPN label EXP value.
- B. The packet is re-evaluated, remarked, and the PHB is based on this new marking.
- C. The topmost MPLS label EXP value.
- D. The Differentiated Services field value in the IP packet header.
Correct Answer: C 🗳️
Question #5
Which two statements about IP SLA are correct? (Choose two.)
- A. IP SLA uses NBAR to provide the reporting engine for statistics that it collects.
- B. IOS IP SLA is a traffic monitoring mechanism that gathers statistics about traffic based on packet headers and fields.
- C. Cisco IOS IP SLA is Layer 2 transport independent.
- D. IOS IP SLA uses active traffic monitoring which allows users to analyze service levels for IP applications.
- E. Cisco IOS IP SLA can be used to help detail billing information for each defined class of service.
Correct Answer: C,D 🗳️
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