642-642 Exam
Quality of Service (QoS)
Exam Number/Code : 642-642
Exam Name : Quality of Service (QoS)
Questions and Answers : 180 Q&As
Update Time: 2010-05-30
Price: $ 79.00 $ 58.00

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5. The newly appointed Certkiller trainee technician wants to know which type of software queuing
mechanism is Frame Relay Traffic Shaping implemented with on the physical interface. What will
your reply be?
A. Priority Queuing (PQ)
B. Custom Queuing (CQ)
C. FIFO
D. Weighted Fair Queuing (WFQ)
E. IP Real Time Transport Protocol (RTP) Priority
Answer: D
6. Why is it beneficial to make use of Enhanced LMI (ELMI) on Cisco networks?
A. ELMI is responsible for providing virtual provisioning tools at the edge of the Frame Relay
network.
B. ELMI permits routers to dynamically download QoS information from Cisco switches for use in
traffic shaping or for congestion management purposes.
C. ELMI provides the router the ability to use additional QoS tools including rate limiting with CAR
and the Modular QoS Command Line Interface (MQC).
D. ELMI allows the router to deliver packets at the line rate of the Frame Relay interface,
regardless of the condition of the Frame Relay network.
Answer: B
7.Which of the following statements are true when you compare DSCP and IP Precedence to each
other? (Choose all that apply.)
A. DSCP is backwards compatible with IP Precedence.
B. DSCP cannot be easily mapped into QoS because of its expanded classification options.
C. DSCP is more granular the IP Precedence, since more marking combinations are available.
D. DSCP appears stubby when compared IP Precedence, since devices make use of DSCP as
defined in RFC exclusively.
E. DSCP is 6 bits long and IP Precedence is 3 bits long.
F. DSCP is more restrictive than IP Precedence, since devices are only allowed to use DSCP as
defined in RFCs.
Answer: ACE
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8. Which MQC command would you use to perform marking properly?
A. precedence 5
B. ip precedence 5
C. set ip precedence 5
D. set ip mark precedence 5
E. mark ip precedence 5
Answer: C