Try and practice the latest Cisco : 642-642 real questions & answers
Updated: May 26, 2026
No. of Questions: 87 Questions & Answers with Testing Engine
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Cisco Quality of Service (QoS) Sample Questions:
1. Where is the error in the following policy-map configuration?
policy-map test class voice priority 168 class mission-critical bandwidth 192 random-detect class class-default fair-queue bandwidth 128
A) The voice traffic class is missing the random-detect command.
B) The bandwidth command is not a valid command for the class-default traffic class in this case.
C) The mission-critical traffic class is missing the queue-limit command.
D) Fair-queue should be enabled for the mission-critical traffic class.
E) The mission-critical traffic class bandwidth guarantee should be lower than the voice traffic class priority bandwidth guarantee.
2. Refer to the partial router configuration. Which two of the following statements are true? (Choose two.)
A) The class-map class1 command will set the qos-group value to 4 for all IP packets.
B) The configuration is invalid since it refers to a class map within a different class.
C) Only those packets which satisfy all of the matches in class1 and class2 will be subject to policing.
D) Any IP packet will be subject to policing.
E) All traffic from a server with the IP address of 147.23.54.21 will be subject to policing.
F) Regardless of destination IP address, all traffic sent to Mac address 1.2.3 will be subject to policing
3. In which two locations is the qos pre-classify command applied to support QoS preclassification over an IPSec/GRE tunnel? (Choose two.)
A) the policy-map
B) the tunnel interface
C) the physical interface
D) the crypto map
E) the class-map
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) Enable fair-queue within the mission-critical traffic class.
B) Increase the WRED max-threshold value for the mission-critical traffic class.
C) Increase the WRED min-threshold value for the mission-critical traffic class.
D) Decrease the queue-limit for the mission-critical traffic class.
E) Decrease the WRED drop probability denominator for the mission-critical traffic class.
5. DRAG DROP
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: E,F | Question # 3 Answer: B,D | Question # 4 Answer: C | Question # 5 Answer: Only visible for members |
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