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Cisco Quality of Service (QoS) Sample Questions:

1. What is the purpose of using multiactions traffic policing?

A) so that class-based policing can mark at Layer 2 and Layer 3 at the same time
B) so that conform traffic from different flows can be marked with different DSCPs
C) so that conform, exceed, and violate traffic can be marked with different CLPs
D) so that exceed traffic can be shaped and violate traffic can be policed
E) so that traffic can be policed using two separate rates

2. At the network layer, IP packets are typically classified based on which three items? (Choose three.)

A) packet length
B) flow control bits
C) content of the ToS byte
D) VLAN Identifier
E) source and destination IP addresses

3. Based on the following show output, which statement is true?
WG1S1#sh mls qos interface fa0/1 FastEthernet0/1 trust state: not trusted trust mode: trust cos COS override: dis default COS: 0 pass-through: none trust device: cisco-phone

A) All incoming CoS markings are trusted.
B) DSCP markings from the Cisco IP Phone are trusted.
C) A Cisco IP Phone is not connected to the fa0/1 switch port.
D) All incoming DSCP markings are trusted.

4. What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt

A) enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set
B) enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set
C) enables the router to increase the shaping rate when BECN bits are received
D) enables the router to lower the shaping rate when BECN bits are received
E) enables the router to lower the shaping rate when FECN bits are received
F) enables the router to increase the shaping rate when FECN bits are received

5. Based on the following Cisco Catalyst 2950 Series switch configurations, which additional command will enable these actions?
Traffic marked with a CoS of 6 or 7 will be serviced by the priority queue.
Traffic marked with a CoS of 0, 1, or 2 will have a 20-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 4 will have a 30-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 3 or 5 will have a 50-percent weight when serviced by the wrr queue.
Catalyst 2950 partial configuration:
no wrr-queue cos-map
wrr-queue cos-map 1 0 1 2
wrr-queue cos-map 2 4
wrr-queue cos-map 3 3 5
wrr-queue cos-map 4 6 7

A) wrr-queue bandwidth 1 10 15 25
B) wrr-queue bandwidth 15 25 10 0
C) wrr-queue bandwidth 1 20 30 50
D) wrr-queue bandwidth 10 15 25 0
E) wrr-queue bandwidth 15 25 10 1

Solutions: