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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 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. If the interactive traffic class exceeds an average rate of 256 kbps, the traffic rate will be throttled down to 128 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. The interactive traffic class will have a maximum bandwidth guarantee of 256 kbps.
E. The interactive traffic class will have a min-rate (min-cir) of 128 kbps.

Question 2

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

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

Question 3

The qos pre-classify command can be configured under which two configuration modes? (Choose two.)

A. router(config-router)#
B. router(config)#
C. router(config-pmap-c)#
D. router(config-crypto-map)#
E. router(config-cmap)#
F. router(config-if)#

Question 4

What are two benefits of WFQ? (Choose two.)

A. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
B. WFQ can provide fixed-delay guarantees.
C. WFQ can provide fixed-bandwidth and fixed-delay guarantees.
D. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
E. WFQ can provide fixed-bandwidth guarantees.
F. WFQ is very easy to configure, and no manual traffic classification is necessary.

Question 5

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

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

Solutions: