Cisco : 642-642 Questions & Answers
Updated: Jul 22, 2026
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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 |
| Classification and Marking | - Packet marking (DSCP, CoS, IP Precedence) - Traffic classification methods |
| Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Congestion Avoidance | - Random Early Detection (RED, WRED) |
| QoS Fundamentals | - QoS models and architectures (Best Effort, IntServ, DiffServ) - Introduction to Quality of Service concepts |
| Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
Cisco Quality of Service (QoS) Sample Questions:
1. Which algorithm (discard method) does WRED use to determine which packets will be dropped when the average queue length becomes larger than the user-specified maximum threshold?
A) packet size based discard
B) tail discard
C) random discard
D) weighted early discard
2. SIMULATION - LAB
A) Please click console
3. SIMULATION - LAB
A) Please click console
4. 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 queue-limit 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) Increase the WRED max-threshold value for the mission-critical traffic class.
E) Increase the WRED min-threshold value for the mission-critical traffic class.
5. Refer to the partial router configuration. Which two of the following statements are true? (Choose two.)
A) Any IP packet will be subject to policing.
B) Regardless of destination IP address, all traffic sent to Mac address 1.2.3 will be subject to policing
C) Only those packets which satisfy all of the matches in class1 and class2 will be subject to policing.
D) All traffic from a server with the IP address of 147.23.54.21 will be subject to policing.
E) The class-map class1 command will set the qos-group value to 4 for all IP packets.
F) The configuration is invalid since it refers to a class map within a different class.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: A | Question # 4 Answer: E | Question # 5 Answer: B,D |
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