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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Classification and Marking | - Modular QoS CLI classification and marking - Network-based application recognition and classification - Layer 2 and Layer 3 marking |
| QoS for Voice and Video Applications | - End-to-end QoS deployment - IP telephony QoS design considerations - Voice traffic requirements |
| QoS Management and Implementation | - QoS deployment considerations - QoS policy configuration and verification - QoS monitoring and troubleshooting |
| Congestion Avoidance | - Weighted Random Early Detection - Random Early Detection |
| Introduction to Quality of Service | - QoS concepts and requirements - QoS models and architectures - Traffic classification and marking concepts |
| Congestion Management | - Queuing mechanisms - Class-Based Weighted Fair Queuing - Low Latency Queuing |
| Link Efficiency Mechanisms | - Link fragmentation and interleaving - Compression technologies |
Cisco Quality of Service (QoS) Sample Questions:
The following commands have been configured under the fa0/1 interface on the 2950 switch:
wrr-queue bandwidth 20 1 80 0
mls qos trust cos
mls qos trust device cisco-phone
Voice traffic from the IP phone that is directly connected to the fa0/1 interface is experiencing excessive delays. What could be the cause of this problem?
- A. The default wrr-queue cos-map is being used.
- B. The trust boundary configuration is not correct.
- C. The default dscp-to-cos map is being used.
- D. The wrr-queue bandwidth weightings are not correct.
- E. The default cos-to-dscp map is being used.
Correct Answer: A 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
Which three factors will affect processing delay? (Choose three.)
- A. CPU speed
- B. router architecture
- C. queuing mechanism
- D. IP switching method
- E. distance of media
- F. type of media
Correct Answer: A,B,D 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)
- A. random-detect dscp-based
- B. bandwidth {kbps}
- C. compress header ip rtp
- D. random-detect ecn
- E. priority {kbps}
- F. shape peak {bps}
Correct Answer: C,E 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
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