642-642 QOS
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
642-642 Exam Policies: Read current policies and
requirements
642-642 Exam Tutorial: Review type of exam questions
642-642 Exam
Topics
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
642-642 Exam
Demo
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
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