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Cisco Quality of Service (QoS) Sample Questions:

1. When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)

A) no mls qos trust dscp
B) switchport priority extend trust
C) mls qos trust cos
D) mls qos cos 5
E) mls qos trust device cisco-phone
F) mls qos trust extend [cos value]

2. Which two of the following statements about CBWFQ are correct? (Choose two.)

A) Inside a class queue, processing is always FIFO, except for the class-default queue.
B) The class-default queue only supports WFQ.
C) Each CBWFQ traffic class is policed using a congestion aware policer.
D) CBWFQ services each class queue using a strict priority scheduler.
E) The CBWFQ scheduler provides a guaranteed amount of minimum bandwidth to each class.

3. HOTSPOT
Hotspot

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

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

Solutions: