Cisco 642-642 Actual Tests : Quality of Service (QoS)

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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. Based on the configuration, which two statements are true? (Choose two.)
Policy-map shape-cbwfq
Class interactive
Shape average 256000
Shape adaptive 128000
Bandwidth 128

A) The interactive traffic class will have a maximum bandwidth guarantee of 256 kbps.
B) The interactive traffic class will have a minimum bandwidth guarantee of 256 kbps.
C) This configuration allows class-based traffic shaping to lower the traffic rate in response to the BECN bit.
D) If the interactive traffic class exceeds an average rate of 256 kbps, the traffic rate will be throttled down to 128 kbps.
E) The interactive traffic class will have a min-rate (min-cir) of 128 kbps.

2. Based on the following 2950 switch configurations, which statement is correct?
no wrr-queue cos-map wrr-queue bandwidth 20 10 70 1 wrr-queue cos-map 4 5 wrr-queue cos-map 1 0 1 2 3 wrr-queue cos-map 3 6 7

A) Queue 2 is setup as the expedite queue.
B) Queue 1 is setup as the expedite queue.
C) Queue 3 is setup as the expedite queue.
D) Queue 4 is setup as the expedite queue.
E) No queue is setup as the expedite queue.

3. Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)

A) random-detect ecn
B) priority {kbps}
C) bandwidth {kbps}
D) shape peak {bps}
E) compress header ip rtp
F) random-detect dscp-based

4. A Cisco Catalyst switch has an IP phone connected to its Fastethernet0/2 port. The IP phone has an attached PC. The Fastethernet0/2 port on the switch has been configured with the commands mls qos trust cos, mls qos trust device cisco-phone, and switchport priority extend trust.
What will happen to a data frame with a CoS of 5 that is sent from the PC through the IP phone to port Fastethernet0/2 on the switch?

A) The IP phone will allow the data packet through without modifying theCoS settings of the data frame.
B) The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.
C) The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.
D) While the packet will pass through the IP phone without modification, the switch will, by default, override theCoS priority with the switch default CoS priority.

5. HOTSPOT

Solutions: