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Cisco Quality of Service (QoS) Sample Questions:

1. To determine the bandwidth requirement for each VoIP call, not including Layer 2 overhead, how much bandwidth per call should be added to account for the voice signaling traffic?

A) 240 bps
B) 640 bps
C) 40 bps
D) 480 bps
E) 20 bps
F) 150 bps

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) The IP phone will allow the data packet through without modifying theCoS settings of the data frame.
B) 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.
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.

3. A major media company recently deployed a new converged network. The original network design used separate networks for graphics and video, interactive data, and voice. The company has been experiencing problems with voice traffic in the new converged network. Most of the time voice quality is perfectly acceptable. Periodically voice quality exhibits unacceptable choppy voice signals, and occasionally calls are dropped. At this time the company is not willing to simply add bandwidth to the network.
Which QoS solution would most likely help to resolve the problem?

A) Use advanced technologies to compress all video and graphics traffic on the network.
B) Use TCP header compression and LFI to reduce delays.
C) Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.
D) Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.

4. Which two values influence how the fragment size should be set when configuring FRF.12? (Choose two.)

A) the Voice over IP (VoIP) packet size
B) the dual FIFO Frame Relay interface queue size
C) the physical interface port speed
D) the software queuing method
E) the CIR of the PVC

5. Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)

A) random-detect dscp-based
B) random-detect ecn
C) shape peak {bps}
D) bandwidth {kbps}
E) priority {kbps}
F) compress header ip rtp

Solutions: