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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

In a typical converged campus network, which two of the following are considered QoS best practices? (Choose two.)

A. Traffic classification and marking is performed at the high speed core layer.
B. Only a reasonable number of applications should be classified into the mission-critical traffic class.
C. NBAR is used at the high speed core layer to discover and classify network applications.
D. Ensure voice traffic is serviced by a weighted fair queue.
E. Catalyst switches should use weighted round robin (WRR) queuing giving the voice traffic the highest priority.
F. Traffic classification and marking is performed as close to the traffic source as possible.

Question 2

Based on the configuration, which two of the following statements are true? (Choose two.)
policy-map police 1
class bulk-ftp
police cir percent 20 pir percent 40
conform-action set-dscp-transmit af11
exceed-action set-dscp-transmit 0
violate-action drop

A. This is a multi-action, class-based policing example.
B. This is a dual-rate, class-based policing example.
C. This is a percentage-based policing example.
D. This configuration will use a single token bucket.
E. This configuration will drop all exceeding traffic.

Question 3

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

Question 4

A Cisco Catalyst switch has an IP phone connected to its Fastethernet0/2 port. The IP phone has an attached PC. The Fastethernet0/2 port on the switch has been configured with the commands mls qos trust cos, mls qos trust device cisco-phone, and switchport priority extend trust.
What will happen to a data frame with a CoS of 5 that is sent from the PC through the IP phone to port Fastethernet0/2 on the switch?

A. The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.
B. The IP phone will allow the data packet through without modifying theCoS settings of the data frame.
C. The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.
D. While the packet will pass through the IP phone without modification, the switch will, by default, override theCoS priority with the switch default CoS priority.

Question 5

What will be the peak shape rate based on the configuration that follows?
policy-map setpeak
class all-traffic
shape peak 32000

A. 96000 bps
B. 64000 bps
C. 80000 bps
D. 16000 bps
E. 32000 bps
F. 48000 bps

Solutions: