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Cisco Quality of Service (QoS) Sample Questions:

1. Which two of the following statements about CBWFQ are correct? (Choose two.)

A) The class-default queue only supports WFQ.
B) The CBWFQ scheduler provides a guaranteed amount of minimum bandwidth to each class.
C) CBWFQ services each class queue using a strict priority scheduler.
D) Each CBWFQ traffic class is policed using a congestion aware policer.
E) Inside a class queue, processing is always FIFO, except for the class-default queue.

2. Mission-critical traffic is not getting a minimum bandwidth of 192 kbps in this policy-map configuration. What should be done to correct the problem?
policy-map test class mission-critical bandwidth 192 shape average 128000 queue-limit 64

A) Increase the maximum queue size for the mission-critical traffic class using the queue-limit 128 command.
B) Set the shape rate to a CIR that is higher than 192 kbps.
C) Decrease the maximum queue size for the mission-critical traffic class using the queue-limit 40 command.
D) Use the shape peak command instead of the shape average command.
E) Replace the bandwidth statement with the priority 192 command.
F) Change the bandwidth statement to the bandwidth 192000 command.

3. Which three characteristics are drawbacks to the use of a best-effort with over-provisioning backbone design? (Choose three.)

A) The design uses a different over-provisioning ratio for the different traffic classes.
B) It requires complex QoS mechanisms at the network core.
C) It requires complex QoS mechanisms at the network edge.
D) Denial of Service attacks on one service can affect all network traffic.
E) Unplanned network failures can cause unexpected congestion in the network.
F) The design costs more to implement than a DiffServ backbone.

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) Decrease the queue-limit for the mission-critical traffic class.
D) Decrease the WRED drop probability denominator for the mission-critical traffic class.
E) Increase the WRED min-threshold value for the mission-critical traffic class.

5. Which three statements regarding WRED are true? (Choose three.)

A) WRED can be applied to a traffic class using CB-WRED.
B) WRED uses a shaping queue to delay excess traffic.
C) WRED can be IP precedence-based or DSCP-based.
D) ECN is an extension of WRE
E) WRED is used to rate-limit the incoming traffic by metering the incoming traffic rate.
F) WRED is an advanced queuing mechanism.

Solutions: