ICND2 – QoS Questions
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Premium Member: You can test your knowledge with these questions first via this link.
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Question 1
[am4show have=’p2;’]Which statement about QoS default behavior is true?
A. Ports are untrusted by default.
B. VoIP traffic is passed without being tagged.
C. Video traffic is passed with a well-known DSCP value of 46.
D. Packets are classified internally with an environment.
E. Packets that arrive with a tag are untagged at the edge of an administrative domain.
Answer: A[/am4show]
Explanation
By default, all ports are in the untrusted state when QoS is enabled.
Reference: https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/24055-173.html
Question 2
[am4show have=’p2;’]Which option describes the purpose of traffic policing?
A. It prioritizes routing protocol traffic.
B. It remarks traffic that is below the CIR
C. It drops traffic that exceeds the CIR.
D. It queues and then transmits traffic that exceeds the CIR.
Answer: C[/am4show]
Explanation
The following diagram illustrates the key difference between traffic policing and traffic shaping. Traffic policing propagates bursts. When the traffic rate reaches the configured maximum rate (or committed information rate), excess traffic is dropped (or remarked). The result is an output rate that appears as a saw-tooth with crests and troughs. In contrast to policing, traffic shaping retains excess packets in a queue and then schedules the excess for later transmission over increments of time. The result of traffic shaping is a smoothed packet output rate.
Note: Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the routing device.
Question 1 is wrong
By default, all ports are in the untrusted state when QoS is enabled.
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/24055-173.html
I agree with Yoyo.
@Yoyo: Yes, answer A is better then answer E. Thanks for your detection, we updated it.
Nice job guys! However, you guys need to update your troubleshooting sim. Thanks!
Theres a lot of information about Q1 on the Internet and the answer is E, Im going to present my exam on April, please someone can assure me 100% that A is the correct answer?
For example, In the composite Quizzes the correct answer is E, so please @9tut, assure the right answer.
Qsn 1.Note: By default, all ports are in the untrusted state when QoS is enabled.
Just took the exam – the question was – What two configurations are REQUIRED for voice QoS? Cannot remember the options though.
from where i can get questions of these answers?