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ICND2 – QoS Questions

October 18th, 2017 in ICND2 200-105 Go to comments

Question 1

Question 2

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.

traffic_policing_vs_shaping.jpg

Note: Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the routing device.

Comments (2) Comments
  1. Yoyo
    November 11th, 2017

    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

  2. bro
    November 17th, 2017

    I agree with Yoyo.