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Cisco Quality of Service (QoS) Sample Questions:

1. Which two different traffic types have the most similar sensitivity to latency, jitter, and packet loss? (Choose two.)

A) streaming video
B) peer-to-peer file sharing
C) video conferencing
D) voice
E) SQL transactions
F) voice signaling

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

3. Refer to the exhibit. QPPB is being used by the service provider (AS30). The table-map and route-map called "important" are implemented on router POP A.
The command bgp-policy destination ip-prec-map is applied to the interface between POP A in AS30 and NAP (AS40).
Which QoS action would have to be applied on POP B in AS30 to ensure that the traffic from the NAP (AS40) to the customer (AS20) will be marked with an IP precedence of flash?

A) Traffic from AS20 must have the community attribute set to10:50 in a route-map, and send-community must be specified.
B) No actions are needed. Traffic must be marked in AS20 by the customer as10:50 before it arrives at the service provider.
C) Traffic from AS20 must be automatically marked via an inbound QoS map on POP B, resulting in the community attribute set to10:50.
D) Traffic from AS20 must have the extended community attribute set to10:50 in a route-map, and send-community extended (or send-community both) must be specified.

4. In a typical converged campus network, which two of the following are considered QoS best practices? (Choose two.)

A) Only a reasonable number of applications should be classified into the mission-critical traffic class.
B) NBAR is used at the high speed core layer to discover and classify network applications.
C) Traffic classification and marking is performed at the high speed core layer.
D) Catalyst switches should use weighted round robin (WRR) queuing giving the voice traffic the highest priority.
E) Ensure voice traffic is serviced by a weighted fair queue.
F) Traffic classification and marking is performed as close to the traffic source as possible.

5. In a managed CE scenario, the customer's network is supporting VoIP and bulk file transfers. According to the best practices, which QoS mechanisms should be applied on the WAN edge CEPE 56-kbps Frame Relay link on the CE outbound direction?

A) LLQ, CB-WRED, CB-Marking, FRTS, FRF.12, and CB-RTP header compression
B) CBWFQ, CB-WRED, CB-Marking, CB-Policing, and FRTS
C) LLQ, CB-WRED, CB-Policing, and CB-TCP and CB-RTP header compressions
D) CBWFQ, FRTS, FRF.12, and CB-RTP header compression
E) WRR, CB-WRED, CB-Marking, FRF.12, and CB-RTP header compression
F) WRR, FRTS, FRF.12, and CB-RTP header compression

Solutions: