642-642 exam questions

Free 642-642 Demo Download

Exam4Dumps.info offers free demo for CCIP 642-642 exam (Quality of Service (QoS)). You can check out the interface, question quality and usability of our practice exams before you decide to buy it. We are the only one site can offer demo for almost all products.

642-642 exam questions

642-642 Exam Description

It is well known that latest 642-642 exam test is the hot exam of Cisco certification. Exam4Dumps.info offer you all the Q&A of the 642-642 real test . It is the examination of the perfect combination and it will help you pass 642-642 exam at the first time!

　
　
Exam : Cisco 642-642
Title : Quality of Service (QOS)


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. 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

3. For the following options, which of the following components of delay varies based on the varying sizes of packets sent through the network?
A. Codec delay
B. Serialization delay
C. Queuing delay
D. Propagation delay
Answer: B

4. SLA(Service-Level Agreement) is a contract between a network service provider and a customer, which usually defines such terms as the type of service, the quality of service and the customer's payment. In an unmanaged CE router implementation, how does the service provider enforce the SLA?
A. by using class-based policing on the CE to PE link to limit the customer's input rate
B. by using class-based random discard on the CE to PE link to limit the customer's input rate
C. by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
D. by marking on the CE to PE link and using class-based policing on the PE to P link
Answer: A

5. As a candidate for CCVP exam, can you tell me what does a router base its opinion of how much bandwidth is available to a queuing tool on a serial interface?
A. The bandwidth command is required before a queuing tool knows how much bandwidth is available.
B. The automatically-sensed physical transmission rate on the serial interface.
C. The clock rate command is required before a queuing tool knows how much bandwidth is available.
D. Defaults to T1 speed, unless the bandwidth command has been configured.
Answer: D

6. Refer to the following parameters, which of the following are not traffic characteristics that can be affected by QoS tools?
A. Delay
B. MTU
C. Reliability
D. Bandwidth
Answer: C