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The related exams:
HP0-S25 Implementing HP ProLiant ML/DL/SL Servers

Quality of Service Exam
Exam Number:642-642
Associated Certifications: CCIP, CCVP, IP Telephony Design Specialist, IP Telephony Express Specialist, IP Telephony Operations Specialist, and IP Telephony Support Specialist
Duration: 90 minutes (45-55 questions)
Available Languages: English and Japanese
 
The QOS 642-642 exam is one of the qualifying exams for the Cisco Certified Internetwork Professional, Cisco Certified Voice Professional, Cisco IP Telephony Design Specialist, Cisco IP Telephony Express Specialist, Cisco IP Telephony Operations Specialist, and Cisco IP Telephony Support Specialist certifications.

The QOS 642-642 exam will test materials covered under the Implementing Cisco Quality of Service QOS v2.1 course. The exam will certify that the successful candidate has knowledge and skills necessary to configure and troubleshoot Cisco IOS routers running Quality of Service protocols in Service Provider and Enterprise environments.

Cisco certification 642-642 exam covers topics on IP QOS, classification and marking Mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, modular QOS command line interface, and QOS Best Practices.

The following information provides general guidelines for the content likely to be included on QOS 642-642 exam. However, other related topics may also appear on any specific delivery of Cisco 642-642 exam.

IP QoS Fundamentals
Given a description of a converged network, identify problems that could lead to poor quality of service and explain how the problems might be resolved
Define the term Quality of Service (QoS) and identify and explain the key steps to implementing QoS on a converged network

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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 [...]]]> Cisco 642-642 exam update new demo,you can download Testinside free 642-642 demo here:

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. 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

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. 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

6. 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