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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

For which service is assured forwarding PHB used?

A. class selector
B. expedited forwarding
C. guaranteed bandwidth
D. best effort

Question 2

Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)

A. bandwidth {kbps}
B. priority {kbps}
C. random-detect dscp-based
D. compress header ip rtp
E. shape peak {bps}
F. random-detect ecn

Question 3

Which algorithm (discard method) does WRED use to determine which packets will be dropped when the average queue length becomes larger than the user-specified maximum threshold?

A. tail discard
B. packet size based discard
C. random discard
D. weighted early discard

Question 4

This policy-map is applied to a 128-kbps serial interface in the output direction. Which set of additional commands within this policy-map will improve the link efficiency on the serial interface?
policy-map test
class voice
priority 25
class telnet
bandwidth remaining percent 20
class ftp
bandwidth remaining percent 30

A. class telnet
fair-queue
B. class ftp
compression header ip
C. class telnet
compression header ip tcp
D. class ftp
fair-queue
E. class voice
no priority 25
bandwidth percent remaining 25
F. class voice
compression header ip tcp

Question 5

Based on the following 2950 switch configurations, which statement is correct?
no wrr-queue cos-map wrr-queue bandwidth 20 10 70 1 wrr-queue cos-map 4 5 wrr-queue cos-map 1 0 1 2 3 wrr-queue cos-map 3 6 7

A. Queue 4 is setup as the expedite queue.
B. No queue is setup as the expedite queue.
C. Queue 1 is setup as the expedite queue.
D. Queue 2 is setup as the expedite queue.
E. Queue 3 is setup as the expedite queue.

Solutions: