Cisco CCIP 642-642

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Cisco Quality of Service (QoS) Sample Questions:

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

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

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

3. What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt

A) enables the router to lower the shaping rate when FECN bits are received
B) enables the router to increase the shaping rate when BECN bits are received
C) enables the router to lower the shaping rate when BECN bits are received
D) enables the router to increase the shaping rate when FECN bits are received
E) enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set
F) enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set

4. What will be the peak shape rate based on the configuration that follows?
policy-map setpeak
class all-traffic
shape peak 32000

A) 48000 bps
B) 80000 bps
C) 96000 bps
D) 16000 bps
E) 64000 bps
F) 32000 bps

5. Where is the error in the following policy-map configuration?
policy-map test class voice priority 168 class mission-critical bandwidth 192 random-detect class class-default fair-queue bandwidth 128

A) Fair-queue should be enabled for the mission-critical traffic class.
B) The bandwidth command is not a valid command for the class-default traffic class in this case.
C) The voice traffic class is missing the random-detect command.
D) The mission-critical traffic class bandwidth guarantee should be lower than the voice traffic class priority bandwidth guarantee.
E) The mission-critical traffic class is missing the queue-limit command.

Solutions:

Question # 1 Answer: A,C

Question # 2 Answer: A

Question # 3 Answer: E

Question # 4 Answer: E

Question # 5 Answer: B