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: 2010-05-31
642-642 Price: $ 79.00
642-642 Exam
Demo
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
642-642 Exam
Objectives
Classification and Marking
Explain how link layer and network
layer markings are used to define service classes and the different applications
represented by each of these service classes
Given a network and a
description of QoS issues, use MQC CLI commands to classify packets
Given a
network and a description of QoS issues, use class-based marking to assign
packets to a specific service class
Describe the function of Network Based
Application Recognition
Describe the purpose of pre-classification to support
QoS in various VPN (IPSEC, GRE, L2TP) configurations
Describe QoS trust
boundaries and their significance in LAN based classification and
marking
Identify the different classification and marking options available
on Cisco L2 and L3 switching platforms
Congestion Management Methods
List and explain the different queuing
algorithms
Explain the components of hardware and software queuing systems on
Cisco routers and how they are effected by tuning and congestion
Describe the
benefits and drawbacks of using WFQ to implement QoS
Explain the purpose and
features of Class-Based WFQ (CBWFQ)
Explain the purpose and features of Low
Latency Queuing (LLQ)
Identify the Cisco IOS commands required to configure
and monitor LLQ on a Cisco router
Describe and explain the different queuing
capabilities available on the Cisco Catalyst 2950 Switch
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