Product Description
Exam Number/Code: 642-642
Exam name: Quality of Service (QoS)
642-642 test is the important of Cisco certifaction. Only you pass the 642-642 exam you could have the chance to get Cisco certifaction. To help examinee, Exambible publish the Questions and Answers about 642-642 exam. And the 181 simulation exam are all designed by expert from Exambible. Examinees could have an enough prepare by these simulation exercises and pass the 642-642 test successfully.
Exambible also provide free 642-642 Demo, examinees can download and use before buying 642-642 Q&As, then decide if they need to purchase.
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Cisco CCIP 642-642 Web Demo
This webdemo is just a demo data, only for reference and learning, there is no other purposes.
1. 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
2.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
3. 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
4. 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
5. 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
6. 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
7. 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
8. Which statement best describes the peer-to-peer traffic (Napster and
Kazaa2) going out on the interface s0/0 on the SF router?
A. The peer-to-peer traffic is not classified by the policy-map test , therefore all peer-to-peer traffic will be dropped.
B. The peer-to-peer traffic will be classified into the class-default traffic class.
C. The peer-to-peer traffic will have a maximum bandwidth guarantee of 25 percent of the s0/0 link bandwidth.
D. The peer-to-peer traffic will be classified into p2p traffic class.
Answer: B
