Cisco Quality of Service (QoS) : 642-642

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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. What are two errors in this policy-map configuration? (Choose two.)
policy-map test
class voice
priority 64
class bulk
bandwidth percent 20
fair-queue
class interactive
bandwidth percent remaining 10
fair-queue
class class-default
fair-queue

A) The bandwidth command is missing for the class-default traffic class.
B) WFQ cannot be configured for the class-default traffic class.
C) The bandwidth units for the bulk and interactive traffic classes are inconsistent.
D) The voice traffic class should have the no fair-queue command.
E) WFQ cannot be configured for the bulk and interactive traffic classes.
F) The priority command cannot be used with the bandwidth command within the same policy-map.

2. What are three methods of reducing delay for critical applications in a converged network? (Choose three.)

A) Apply payload compression.
B) Increase all queue depths.
C) Apply header compression.
D) Reduce inter-packet gaps.
E) Increase link capacities.
F) Increase LFI fragment size.

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

4. DRAG DROP

5. In a typical converged campus network, which two of the following are considered QoS best practices? (Choose two.)

A) Catalyst switches should use weighted round robin (WRR) queuing giving the voice traffic the highest priority.
B) Only a reasonable number of applications should be classified into the mission-critical traffic class.
C) Traffic classification and marking is performed at the high speed core layer.
D) NBAR is used at the high speed core layer to discover and classify network applications.
E) Traffic classification and marking is performed as close to the traffic source as possible.
F) Ensure voice traffic is serviced by a weighted fair queue.

Solutions: