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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

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

Question 2

Which command is typically applied to the voice traffic class within a policy-map?

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

Question 3

What describes the use of best-effort service with overprovisioning?

A. ensuring quality of service by deploying sophisticated prioritization and congestion management mechanisms
B. ensuring quality of service by providing more than the aggregate bandwidth required
C. ensuring quality of service by being able to load balance across links in times of congestion
D. ensuring constant availability by provisioning multiple paths through the network
E. ensuring availability and quality of service by always provisioning key services across at least two service provider networks

Question 4

Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of commands shown below, where does the trust boundary lie?
interface fa0/2 mls qos trust cos mls qos trust device cisco-phone switchport voice vlan 112

A. between the PC port and the LAN port on the IP phone
B. between the access layer switch and the distribution layer switch
C. between the IP phone and the switch
D. between the IP phone and the PC

Question 5

DRAG DROP
Drop

Solutions: