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Cisco 642-785 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Service Provider QoS Implementation | - Policy maps and class maps - Implementing QoS on Cisco IOS routers |
| Topic 2: QoS Mechanisms in MPLS Networks | - RFC 3270 Uniform and Pipe modes - EXP and DSCP mapping |
| Topic 3: Monitoring and Troubleshooting QoS | - IP SLA and performance measurement - QoS statistics and verification |
| Topic 4: Congestion Management and Avoidance | - WFQ, CBWFQ and Priority Queuing - WRED configuration and behavior |
| Topic 5: Quality of Service Fundamentals | - Traffic classification and marking - Service Provider QoS models and design |
Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:
Which statement about when you mix TCP and UDP traffic in the same class and overflow occurs is true?
- A. UDP traffic suffers more, because TCP guarantees delivery.
- B. Mixing TCP and UDP in the same class is not supported.
- C. The overflow is not a problem, because both TCP and UDP packets get randomly dropped and traffic will back out.
- D. TCP traffic is starved, because UDP never slows down when packets get dropped.
Correct Answer: D 🗳️
An MPLS VPN customer with managed CE services recently made some changes to their call manager configurations. Now the customer reports that their VoIP traffic voice quality is very poor. What could be a cause of the problem?
- A. The traffic shaping rate for the VoIP traffic class is too low.
- B. The VoIP traffic is being marked as DSCP EF.
- C. The customer changed the codec used for voice compression from G.729 to G.711.
- D. The VoIP traffic class is not being policed at the CE router egress.
- E. RTP header compression is used for the VoIP traffic class.
Correct Answer: C 🗳️
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. decreases congestion by avoiding global UDP synchronization
- B. provides congestion management by queueing the traffic using CBWFQ
- C. provides congestion management by queueing the traffic using LLQ
- D. provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority
- E. decreases the probability of congestion by selectively dropping TCP packets before the queue is full
Correct Answer: E 🗳️
When the RFC 3270 Pipe mode is used, the PHB at the egress router is based on which of these?
- A. The topmost MPLS label EXP value.
- B. The MPLS VPN label EXP value.
- C. The packet is re-evaluated, remarked, and the PHB is based on this new marking.
- D. The Differentiated Services field value in the IP packet header.
Correct Answer: A 🗳️
Refer to the exhibit.
Which two statements are correct? (Choose two.)
- A. Within the cust2-classes policy, the gold class is guaranteed 30 percent of the S3/2 interface bandwidth. Silver is guaranteed 15 percent of the S3/2 interface bandwidth. Bronze is guaranteed 10 percent of the S3/2 interface bandwidth.
- B. This example is a hierarchical MQC example, and the cust-policy is the child policy.
- C. The policy map cust-policy specifies an average traffic shaping rate of 384 kb/s for the cust1 class and assigns the service policy cust1-classes to the cust1 class.
- D. This example queues the traffic into different CBWFQ classes before the aggregate traffic is shaped.
- E. Within the cust1-classes policy, the gold class is guaranteed 50 percent of the bandwidth. Silver is guaranteed 20 percent of the bandwidth, and bronze is guaranteed 15 percent of the bandwidth.
- F. The traffic class cust2 is ensured a bandwidth of 51.2 kb/s.
Correct Answer: C,E 🗳️
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