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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| QoS Implementation on Cisco Devices | - Modular QoS CLI (MQC) configuration - End-to-end QoS deployment considerations |
| Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| Congestion Avoidance | - Random Early Detection (RED, WRED) |
| QoS Fundamentals | - Introduction to Quality of Service concepts - QoS models and architectures (Best Effort, IntServ, DiffServ) |
| Classification and Marking | - Packet marking (DSCP, CoS, IP Precedence) - Traffic classification methods |
| Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
Cisco Quality of Service (QoS) Sample Questions:
Which three characteristics best describe a converged network? (Choose three.)
- A. prioritization and congestion management to ensure voice quality
- B. the potential for poor voice quality due to other traffic
- C. the separation of the voice and data networks into two networks to ensure voice quality
- D. the use of overprovisioning to ensure voice quality
- E. the random dropping of lower priority traffic to ensure that high-priority traffic gets through
- F. the use of a separate high-speed link for bulk traffic to avoid interference with other traffic
Which three factors will affect processing delay? (Choose three.)
- A. distance of media
- B. IP switching method
- C. type of media
- D. router architecture
- E. queuing mechanism
- F. CPU speed
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A Frame Relay interface has been configured for adaptive shaping with a minimum rate of 15 kbps. The current maximum transmit rate is 56 kbps.
If three FECNs are received over the next 4 seconds, what will be the maximum transmit rate after the last FECN has been received?
- A. 10 kbps
- B. 28 kbps
- C. 7 kbps
- D. 37 kbps
- E. 56 kbps
- F. 15 kbps
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DRAG DROP
Drop
The show policy-map interface command output is showing too many random drops for the mission-critical traffic class. What can be changed to reduce the random drops?
- A. Decrease the WRED drop probability denominator for the mission-critical traffic class.
- B. Increase the WRED min-threshold value for the mission-critical traffic class.
- C. Increase the WRED max-threshold value for the mission-critical traffic class.
- D. Decrease the queue-limit for the mission-critical traffic class.
- E. Enable fair-queue within the mission-critical traffic class.
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