TestInside QoS 642-642
Quality of Service (QoS) : 642-642 Exam
Exam Number/Code: 642-642
Exam Name: Quality of Service (QoS)
Questions and Answers: 90 Q&As
Price: $79.00
Update Time: 2008-6-11
“Quality of Service (QoS)”, also known as 642-642 exam, is a Cisco certification.
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1.What is the purpose of the qos pre-classify command?
A. to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header
B. to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header
C. to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP
header
D. to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header
E. to enable class-based marking on tunnel interface
F. to enable class-based marking on IPSec crypto maps
Answer:C
2.What are two benefits of WFQ? (Choose two.)
A. WFQ is very easy to configure, and no manual traffic classification is necessary.
B. WFQ can provide fixed-bandwidth and fixed-delay guarantees. C. WFQ can provide fixed-bandwidth guarantees.
D. WFQ can provide fixed-delay guarantees.
E. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
F. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
Answer:AE
3.Based on the configuration, which two of the following statements are true? (Choose two.)
A. This configuration will use a single token bucket.
B. This configuration will drop all exceeding traffic. C. This is a dual-rate, class-based policing example. D. This is a percentage-based policing example.
E. This is a multi-action, class-based policing example. Answer:CD
4.Based on the configuration, which two statements are true? (Choose two.)
A. The interactive traffic class will have a minimum bandwidth guarantee of 256 kbps.
B. The interactive traffic class will have a maximum bandwidth guarantee of 256 kbps.
C. If the interactive traffic class exceeds an average rate of 256 kbps, the traffic rate will be throttled down to 128 kbps.
D. This configuration allows class-based traffic shaping to lower the traffic rate in response to the
BECN bit.
E. The interactive traffic class will have a min-rate (min-cir) of 128 kbps. Answer:DE
5.Which technology is required when configuring FRF.12 on a Cisco device? A. FRF11.c
B. FRF.8
C. VoFR
D. MLP with interleaving
E. FRTS F. WRED
Answer:E
6.What are three methods of reducing delay for critical applications in a converged network?
(Choose three.)
A. Apply payload compression. B. Increase link capacities.
C. Apply header compression. D. Increase LFI fragment size. E. Reduce inter-packet gaps.
F. Increase all queue depths. Answer:ABC
7.At the network layer, IP packets are typically classified based on which three items? (Choose three.)
A. packet length
B. VLAN Identifier
C. flow control bits
D. source and destination IP addresses
E. content of the ToS byte
Answer:ADE
8.What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)
A. decrease delay
B. decrease jitter
C. increase link speed
D. increase throughput
E. decrease propagation delay
Answer:ABD
9.Which mechanism is used for the prioritizing, protection, and isolation of traffic based on marking?
A. classification and marking
B. congestion management
C. congestion avoidance
D. metering E. policing F. shaping
Answer:B
10. Click and drag each statement on the left to the proper traffic policing method on the right.
Bc is the maximum number of
tokens accumulated.
Single Rate–Single Bucket
Bc + Be is the maximum number of
tokens accumulated.
Traffic is policed using two separate
rates.
Tokens exceeding Bc are discarded.
Single Rate–Dual Bucket
Traffic exceeding the normal burst
rate is marked.
Tp bucket is checked to determine if
the traffic rate is in violation.
Dual Rate
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