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Cisco Quality of Service (QoS) Sample Questions:

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

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

2. Based on the following Cisco Catalyst 2950 Series switch configurations, which additional command will enable these actions?
Traffic marked with a CoS of 6 or 7 will be serviced by the priority queue.
Traffic marked with a CoS of 0, 1, or 2 will have a 20-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 4 will have a 30-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 3 or 5 will have a 50-percent weight when serviced by the wrr queue.
Catalyst 2950 partial configuration:
no wrr-queue cos-map
wrr-queue cos-map 1 0 1 2
wrr-queue cos-map 2 4
wrr-queue cos-map 3 3 5
wrr-queue cos-map 4 6 7

A) wrr-queue bandwidth 15 25 10 1
B) wrr-queue bandwidth 10 15 25 0
C) wrr-queue bandwidth 1 20 30 50
D) wrr-queue bandwidth 1 10 15 25
E) wrr-queue bandwidth 15 25 10 0

3. What is the purpose of the qos pre-classify command?

A) to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header
B) to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header
C) to enable class-based marking on IPSec crypto maps
D) to enable class-based marking on tunnel interface
E) to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header
F) to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header

4. According to the best practices, in a service provider network, which statement is true as related to the QoS policy that should be implemented on the inbound provider (P) to provider (P) router link?

A) Traffic policing should be implemented to rate-limit the ingress traffic into the P router.
B) In the DiffServ model, all ingress and egress QoS processing are done at the network edge (for example, PE router), so no input or output QoS policy will be needed on the P to P link.
C) Class-based marking should be implemented because it will be needed for the class-based queuing that will be used on the P router output.
D) Because traffic should have already been policed and marked on the upstream ingress PE router, no input QoS policy is needed on the P to P link.

5. A major media company recently deployed a new converged network. The original network design used separate networks for graphics and video, interactive data, and voice. The company has been experiencing problems with voice traffic in the new converged network. Most of the time voice quality is perfectly acceptable. Periodically voice quality exhibits unacceptable choppy voice signals, and occasionally calls are dropped. At this time the company is not willing to simply add bandwidth to the network.
Which QoS solution would most likely help to resolve the problem?

A) Use advanced technologies to compress all video and graphics traffic on the network.
B) Use TCP header compression and LFI to reduce delays.
C) Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.
D) Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.

Solutions: