Quality of Service (QoS) (642-642) Free Practice Test

Question 1

Which technology is required when configuring FRF.12 on a Cisco device?

A. FRTS

B. FRF11.c

C. MLP with interleaving

D. FRF.8

E. VoFR

F. WRED

Correct Answer: A

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Question 2

When LLQ is being configured, which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?

A. queue-limit

B. bandwidth

C. hold-queue

D. police

E. priority

Correct Answer: D

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Question 3

A Frame Relay interface has been configured for adaptive shaping with a minimum rate of 15 kbps. The current maximum transmit rate is 56 kbps.
If three FECNs are received over the next 4 seconds, what will be the maximum transmit rate after the last FECN has been received?

A. 7 kbps

B. 37 kbps

C. 15 kbps

D. 56 kbps

E. 10 kbps

F. 28 kbps

Correct Answer: D

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Question 4

DRAG DROP
Drop

Correct Answer:

Question 5

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 switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.

B. The IP phone will allow the data packet through without modifying theCoS settings of the data frame.

C. 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.

D. The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.

Correct Answer: B

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Question 6

Refer to the exhibit. Which three statements are true about the configuration? (Choose three.)
class-map class-1
match ip rtp 2024 1000
class-map class 2
match dscp 5 6 7
policy-map access-group-1-traffic
class class-1
shape peak 16000
class class-2
police 8000 1000
conform-action set-dscp-transmit 1
exceed-action set-dscp-transmit 0
violate-action drop
class class-default
fair-queue 16
queue-limit 20
interface fastethernet 0/0
service-policy output access-group1-traffic

A. Traffic that is subject to policing will have the DCSP set to 0 if the rate exceeds 1000 bps.

B. IP traffic (DSCPs 5, 6, and 7) that is sent on fastethernet 0/0 will be traffic policed.

C. IP traffic (DSCPs 1, 2, 3, and 4) that is sent on fastethernet 0/0 are considered to have a violate status and are dropped.

D. Traffic that is subject to shaping can burst up to 32,000 bps.

E. IP traffic (DSCP 0) that is sent on fastethernet 0/0 will be subject to fair queuing.

F. RTP traffic (ports 2024 and 1000) that is sent on fastethernet 0/0 will be traffic shaped.

Correct Answer: B,D,E

Question 7

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 TCP header compression and LFI to reduce delays.

B. Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.

C. Use advanced technologies to compress all video and graphics traffic on the network.

D. Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.

Correct Answer: D

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Question 8

Refer to the exhibit. A service provider is considering several alternative provisioning schemes for a new network. One proposed scheme involves aggregating 10-Mbps links from customers into a network with multiple 100-Mbps links to ensure that the network links have at least two times the capacity of the aggregate of the customer links.
What is the most appropriate description for the proposed scheme?

A. overaggregate

B. oversubscription

C. Bandwidth-on-Demand

D. overprovisioning

E. CIR of 0

Correct Answer: D

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Question 9

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 lower the shaping rate when BECN bits are received

C. enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set

D. enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set

E. enables the router to increase the shaping rate when BECN bits are received

F. enables the router to increase the shaping rate when FECN bits are received

Correct Answer: C

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Cisco Quality of Service (QoS) (642-642) Free Practice Test