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Cisco 642-785 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: QoS Fundamentals in Service Provider Networks | 20% | - DiffServ, IntServ, and MPLS QoS integration - Classification and marking mechanisms - Quality of Service models and architectures |
| Topic 2: Traffic Policing and Shaping | 20% | - Policing concepts and configuration - Congestion management and avoidance - Shaping mechanisms and operation |
| Topic 3: 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 |
| Topic 4: Queuing and Scheduling Mechanisms | 25% | - Modular QoS CLI (MQC) implementation - Low Latency Queuing (LLQ) - Class-Based Weighted Fair Queuing (CBWFQ) |
| Topic 5: Monitoring and Troubleshooting QoS | 20% | - Verifying QoS policies on IOS and IOS XR - Analyzing queuing and congestion problems - Troubleshooting classification and marking issues |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
Where do service providers apply policy when traffic is leaving the customer network? (Choose two.)
- A. Apply output policy on the CE interface toward PE, if CE is managed.
- B. Apply input policy on the PE interface toward CE, if CE is unmanaged.
- C. Apply input policy on the CE interface toward PE, if CE is unmanaged.
- D. Apply output policy on the PE interface toward CE, if CE is managed.
- E. Apply input policy on the PE interface toward CE, if CE is managed.
Correct Answer: A,B 🗳️
Refer to the exhibit.
You have implemented RFC 3270 Short Pipe mode in your MPLS network. A customer packet with the DSCP value of AF31 has been sent to the ingress PE router. The PE router has set the MPLS experimental bits per policy, but the policer has remarked the experimental bits of the top label. What will the DSCP value of the packet be when it leaves the egress PE router?
- A. CS4
- B. AF31
- C. CS3
- D. BE
- E. CS1
Correct Answer: B 🗳️
Which two match statements are correct in Cisco IOS Software? (Choose two.)
- A. class-map class3 match dscp af31 match dscp af41
- B. class-map match-none class2 match protocol ip
- C. class-map match-any class3 match dscp af31 match dscp af41
- D. class-map class1 match not protocol ip
Correct Answer: C,D 🗳️
Which three issues are important challenges for monitoring service quality in the SP core network? (Choose three.)
- A. Packets may have to be dropped when a link is congested.
- B. Packets have to traverse many network devices and links that add up to the overall delay.
- C. Traffic flows are continuously high.
- D. Relatively few tools are available for collecting service quality data.
- E. Multiple flows compete for a limited amount of bandwidth.
Correct Answer: A,B,E 🗳️
Which command shows real traffic statistics on each class map on the 10 Gigabit interface 0/10/0/0 at the egress direction?
- A. show qos interface tenGigE 0/10/0/0 output
- B. show policy-map interface tenGigE 0/10/0/0 output
- C. show policy-map interface tenGigE 0/10/0/0 egress
- D. show service-policy interface tenGigE 0/10/0/0 egress
- E. show qos interface tenGigE 0/10/0/0 egress
- F. show service-policy interface tenGigE 0/10/0/0 output
Correct Answer: B 🗳️
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