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Cisco 642-642 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing Cisco Quality of Service (QoS) |
| Exam Number: | 642-642 |
| Real Exam Qty: | Approximately 55-65 questions |
| Certificate Validity Period: | Retired exam |
| Exam Format: | Multiple Choice, Multiple Answer, Testlet, Simulation |
| Passing Score: | Variable (Cisco does not publish a fixed passing score) |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Related Certifications: | Cisco Certified Network Professional (CCNP) Cisco Certified Internetwork Professional (CCIP) |
| Exam Price: | USD 250 |
| Recommended Training: | Cisco QoS Training |
| Exam Registration: | Cisco Certification Exam Registration |
| Sample Questions: | Cisco 642-642 Sample Questions |
| Exam Way: | Pearson VUE testing centers and authorized Cisco exam delivery locations (legacy exam) |
| Pre Condition: | Recommended knowledge of Cisco routing and switching technologies. No formal prerequisite exam was required for 642-642. |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/qos.html |
Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Congestion Avoidance | - Weighted Random Early Detection - Random Early Detection |
| Classification and Marking | - Layer 2 and Layer 3 marking - Modular QoS CLI classification and marking - Network-based application recognition and classification |
| QoS Management and Implementation | - QoS deployment considerations - QoS monitoring and troubleshooting - QoS policy configuration and verification |
| Congestion Management | - Low Latency Queuing - Class-Based Weighted Fair Queuing - Queuing mechanisms |
| Introduction to Quality of Service | - Traffic classification and marking concepts - QoS concepts and requirements - QoS models and architectures |
| Link Efficiency Mechanisms | - Compression technologies - Link fragmentation and interleaving |
| QoS for Voice and Video Applications | - IP telephony QoS design considerations - Voice traffic requirements - End-to-end QoS deployment |
Cisco Quality of Service (QoS) Sample Questions:
HOTSPOT
Explanation:
In a managed CE scenario, the customer's network is supporting VoIP and bulk file transfers. According to the best practices, which QoS mechanisms should be applied on the WAN edge CEPE 56-kbps Frame Relay link on the CE outbound direction?
- A. LLQ, CB-WRED, CB-Policing, and CB-TCP and CB-RTP header compressions
- B. WRR, FRTS, FRF.12, and CB-RTP header compression
- C. CBWFQ, CB-WRED, CB-Marking, CB-Policing, and FRTS
- D. WRR, CB-WRED, CB-Marking, FRF.12, and CB-RTP header compression
- E. LLQ, CB-WRED, CB-Marking, FRTS, FRF.12, and CB-RTP header compression
- F. CBWFQ, FRTS, FRF.12, and CB-RTP header compression
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What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)
- A. increase link speed
- B. increase throughput
- C. decrease propagation delay
- D. decrease delay
- E. decrease jitter
Which three characteristics best describe a converged network? (Choose three.)
- A. the random dropping of lower priority traffic to ensure that high-priority traffic gets through
- B. the potential for poor voice quality due to other traffic
- C. the use of overprovisioning to ensure voice quality
- D. the separation of the voice and data networks into two networks to ensure voice quality
- E. the use of a separate high-speed link for bulk traffic to avoid interference with other traffic
- F. prioritization and congestion management to ensure voice quality
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. Increase the WRED min-threshold value for the mission-critical traffic class.
- B. Decrease the WRED drop probability denominator for the mission-critical traffic class.
- C. Enable fair-queue within the mission-critical traffic class.
- D. Decrease the queue-limit for the mission-critical traffic class.
- E. Increase the WRED max-threshold value for the mission-critical traffic class.
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