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Cisco Quality of Service (QoS) Sample Questions:

1. When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)

A) mls qos trust extend [cos value]
B) mls qos cos 5
C) switchport priority extend trust
D) no mls qos trust dscp
E) mls qos trust cos
F) mls qos trust device cisco-phone

2. When LLQ is being configured, which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?

A) priority
B) bandwidth
C) hold-queue
D) police
E) queue-limit

3. HOTSPOT

4. 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 1 10 15 25
B) wrr-queue bandwidth 15 25 10 0
C) wrr-queue bandwidth 1 20 30 50
D) wrr-queue bandwidth 10 15 25 0
E) wrr-queue bandwidth 15 25 10 1

5. Which QoS mechanism adds IP Precedence information for prefixes into the FIB table?

A) Class-Based Marking
B) AutoQoS
C) Class-Based WRED
D) QPPB
E) QoS pre-classify
F) LLQ

Solutions: