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Cisco Quality of Service (QoS) Sample Questions:

1. Refer to the exhibit. Why would applying the limit-interactive policy-map to the fa0/0 interface as shown below cause an error?
interface fa0/0 service-policy input limit-interactive

A) TCP header compression can only be applied in the output direction.
B) There is already an output service-policy defined on the fa0/0 interface.
C) Class-based policing can only be applied in the output direction.
D) The interactive class-map has not been configured.
E) The interactive traffic class is missing the bandwidth {kbps} command.

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

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

3. The qos pre-classify command can be configured under which two configuration modes? (Choose two.)

A) router(config-crypto-map)#
B) router(config)#
C) router(config-pmap-c)#
D) router(config-router)#
E) router(config-cmap)#
F) router(config-if)#

4. What are two benefits of WFQ? (Choose two.)

A) WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
B) WFQ can provide fixed-bandwidth guarantees.
C) Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
D) WFQ can provide fixed-delay guarantees.
E) WFQ can provide fixed-bandwidth and fixed-delay guarantees.
F) WFQ is very easy to configure, and no manual traffic classification is necessary.

5. Which algorithm (discard method) does WRED use to determine which packets will be dropped when the average queue length becomes larger than the user-specified maximum threshold?

A) packet size based discard
B) tail discard
C) random discard
D) weighted early discard

Solutions: