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Cisco Quality of Service (QoS) Sample Questions:

1. DRAG DROP
Drop

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

3. DRAG DROP
Drop

4. What is the purpose of the qos pre-classify command?

A) to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header
B) to enable class-based marking on IPSec crypto maps
C) to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header
D) to enable class-based marking on tunnel interface
E) to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header
F) to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header

5. Refer to the exhibit. Which three statements are true about the configuration? (Choose three.)
class-map class-1
match ip rtp 2024 1000
class-map class 2
match dscp 5 6 7
policy-map access-group-1-traffic
class class-1
shape peak 16000
class class-2
police 8000 1000
conform-action set-dscp-transmit 1
exceed-action set-dscp-transmit 0
violate-action drop
class class-default
fair-queue 16
queue-limit 20
interface fastethernet 0/0
service-policy output access-group1-traffic

A) IP traffic (DSCPs 1, 2, 3, and 4) that is sent on fastethernet 0/0 are considered to have a violate status and are dropped.
B) Traffic that is subject to shaping can burst up to 32,000 bps.
C) Traffic that is subject to policing will have the DCSP set to 0 if the rate exceeds 1000 bps.
D) IP traffic (DSCP 0) that is sent on fastethernet 0/0 will be subject to fair queuing.
E) IP traffic (DSCPs 5, 6, and 7) that is sent on fastethernet 0/0 will be traffic policed.
F) RTP traffic (ports 2024 and 1000) that is sent on fastethernet 0/0 will be traffic shaped.

Solutions: