Try Cisco : 642-642 valid & accurate questions and answers
Updated: Sep 12, 2026
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Cisco 642-642 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing Cisco Quality of Service (QoS) |
| Exam Number: | 642-642 |
| Related Certifications: | Cisco Certified Internetwork Professional (CCIP) Cisco Certified Network Professional (CCNP) |
| Certificate Validity Period: | Retired exam |
| Real Exam Qty: | Approximately 55-65 questions |
| Exam Duration: | 90 minutes |
| Exam Format: | Testlet, Multiple Choice, Simulation, Multiple Answer |
| Available Languages: | English |
| Exam Price: | USD 250 |
| Passing Score: | Variable (Cisco does not publish a fixed passing score) |
| 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 |
|---|---|
| Topic 1: QoS for Voice and Video Applications | - End-to-end QoS deployment - Voice traffic requirements - IP telephony QoS design considerations |
| Topic 2: Classification and Marking | - Network-based application recognition and classification - Modular QoS CLI classification and marking - Layer 2 and Layer 3 marking |
| Topic 3: Link Efficiency Mechanisms | - Link fragmentation and interleaving - Compression technologies |
| Topic 4: Congestion Avoidance | - Weighted Random Early Detection - Random Early Detection |
| Topic 5: QoS Management and Implementation | - QoS monitoring and troubleshooting - QoS deployment considerations - QoS policy configuration and verification |
| Topic 6: Congestion Management | - Class-Based Weighted Fair Queuing - Queuing mechanisms - Low Latency Queuing |
| Topic 7: Introduction to Quality of Service | - QoS concepts and requirements - Traffic classification and marking concepts - QoS models and architectures |
Cisco Quality of Service (QoS) Sample Questions:
Refer to the exhibit. A service provider is considering several alternative provisioning schemes for a new network. One proposed scheme involves aggregating 10-Mbps links from customers into a network with multiple 100-Mbps links to ensure that the network links have at least two times the capacity of the aggregate of the customer links.
What is the most appropriate description for the proposed scheme?
- A. overprovisioning
- B. CIR of 0
- C. oversubscription
- D. overaggregate
- E. Bandwidth-on-Demand
Correct Answer: A 🗳️
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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. Increase the WRED max-threshold value for the mission-critical traffic class.
- C. Enable fair-queue within the mission-critical traffic class.
- D. Decrease the WRED drop probability denominator for the mission-critical traffic class.
- E. Decrease the queue-limit for the mission-critical traffic class.
Correct Answer: A 🗳️
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Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)
- A. bandwidth {kbps}
- B. priority {kbps}
- C. compress header ip rtp
- D. random-detect ecn
- E. shape peak {bps}
- F. random-detect dscp-based
Correct Answer: B,C 🗳️
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What are two benefits of WFQ? (Choose two.)
- A. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
- B. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
- C. WFQ is very easy to configure, and no manual traffic classification is necessary.
- D. WFQ can provide fixed-delay guarantees.
- E. WFQ can provide fixed-bandwidth guarantees.
- F. WFQ can provide fixed-bandwidth and fixed-delay guarantees.
Correct Answer: A,C 🗳️
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