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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. In which two locations is the qos pre-classify command applied to support QoS preclassification over an IPSec/GRE tunnel? (Choose two.)

A) the physical interface
B) the tunnel interface
C) the policy-map
D) the class-map
E) the crypto map

2. The following commands have been configured under the fa0/1 interface on the 2950 switch:
wrr-queue bandwidth 20 1 80 0
mls qos trust cos
mls qos trust device cisco-phone
Voice traffic from the IP phone that is directly connected to the fa0/1 interface is experiencing excessive delays. What could be the cause of this problem?

A) The trust boundary configuration is not correct.
B) The wrr-queue bandwidth weightings are not correct.
C) The default cos-to-dscp map is being used.
D) The default wrr-queue cos-map is being used.
E) The default dscp-to-cos map is being used.

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

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

4. HOTSPOT

5. 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) 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.
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) The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.

Solutions: