642-642 test answers
642-642 test answers
642-642 test answers
642-642 Exam
Quality of Service (QoS)
* Exam Number/Code : 642-642
* Exam Name : Quality of Service (QoS)
* Questions and Answers : 181 Q&As
* Update Time: 2010-06-08
* Price: $ 79.00
1. WFQ(Weighted Fair Queuing) is a data packet scheduling technique allowing different scheduling priorities to statistically multiplexed data flows. For the following statements, 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-delay guarantees.
C. WFQ can provide fixed-bandwidth and fixed-delay guarantees.
D. WFQ can provide fixed-bandwidth guarantees.
E. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
Answer: AE
2. The SF and SJ routes are running OSPF as the routing protocol. Since a policy-map applied to the SF router s0/0 interface, the SF and SJ routers are no longer able to establish full OSPF adjacency between them. On the basis of the SF router configuration and various show outputs from the SF router. Which change to the policy-map in the SF router configuration could solve the OSPF problem?
A. Provide a bandwidth guarantee to the class-defalut traffic class using bandwidth percent 25.
B. Change bandwidth percent 5 for the cs6 traffic class to bandwidth percent 25.
C. Change bandwidth percent 5 fot the cs6 traffic class to priority 8.
D. Use the no police 8000 conform-action drop exceed-action transmit command for the cs6 traffic class.
Answer: D
3. After learning QoS, for the following options, Which of the following characterize problems that could occur with voice traffic when QoS is not applied in a network?(choose two)
A. Voice sounds choppy.
B. Calls are disconnected.
C. VoIP broadcasts increase as Queuing delay increases, causing delay and caller interaction problems.
D. Voice call requires more bandwidth as lost packets are retransmitted.
Answer: AB
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