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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

HOTSPOT
Hotspot

Question 2

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. Increase the WRED min-threshold value for the mission-critical traffic class.
B. Enable fair-queue within the mission-critical traffic class.
C. Increase the WRED max-threshold value for the mission-critical traffic class.
D. Decrease the queue-limit for the mission-critical traffic class.
E. Decrease the WRED drop probability denominator for the mission-critical traffic class.

Question 3

In an unmanaged CE router implementation, how does the service provider enforce the SLA?

A. by using class-based random discard on the CE to PE link to limit the customer's input rate
B. by using class-based policing on the CE to PE link to limit the customer's input rate
C. by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
D. by marking on the CE to PE link and using class-based policing on the PE to P link

Question 4

Based on the following policy-map configuration, the bulk traffic class packets are not being ECN
marked, yet there are many random drops in the bulk traffic class. What is the most likely cause of
the problem?
router(config)# policy-map MyPolicy
router(config-pmap)# class bulk
router(config-pmap)# bandwidth 128
router(config-pmap-c)# random-detect dscp-based
router(config-pmap-c)# random-detect dscp af31 32 40 10
router(config-pmap-c)# random-detect dscp af32 28 40 10
router(config-pmap-c)# random-detect dscp af33 24 40 10
router(config-pmap-c)# random-detect ecn

A. The endpoints generating the bulk traffic packets are not ECN capable.
B. The CB-WRED max threshold is set too high.
C. Some of the routers within the traffic path are not ECN capable.
D. The CB-WRED mark probability denominator is set too low.
E. The CB-WRED min threshold is set too low.

Question 5

HOTSPOT

Solutions: