Cisco Quality of Service (QoS) Sample Questions:

1. In which two locations is the qos pre-classify command applied to support QoS preclassification over an IPSec/GRE tunnel? (Choose two.)

A) the policy-map
B) the crypto map
C) the class-map
D) the tunnel interface
E) the physical interface

2. Where is the error in the following policy-map configuration?
policy-map test class voice priority 168 class mission-critical bandwidth 192 random-detect class class-default fair-queue bandwidth 128

A) The bandwidth command is not a valid command for the class-default traffic class in this case.
B) Fair-queue should be enabled for the mission-critical traffic class.
C) The mission-critical traffic class is missing the queue-limit command.
D) The voice traffic class is missing the random-detect command.
E) The mission-critical traffic class bandwidth guarantee should be lower than the voice traffic class priority bandwidth guarantee.

3. According to the best practices, which statement is true as related to the QoS policy that should be implemented on the outbound provider (P) to provider (P) router link in a service provider network that is supporting both VoIP and data?

A) In the DiffServ model, ingress and egress QoS mechanisms are only required on the provider edge (PE) routers, so no QoS policy is needed on the P to P link.
B) CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
C) CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.
D) LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.

4. Which of the following configurations requires the use of hierarchical policy maps?

A) the use of class-based WRED within a CBWFQ class queue
B) the use of nested class-maps with class-based marking
C) the use of CBWFQ inside class-based shaping
D) the use of a strict priority-class queue within CBWFQ
E) the use of both the bandwidth and shape statements within a CBWFQ class queue

5. The show policy-map interface command output is showing too many random drops for the mission-critical traffic class. What can be changed to reduce the random drops?

A) Increase the WRED min-threshold value for the mission-critical traffic class.
B) Decrease the WRED drop probability denominator for the mission-critical traffic class.
C) Decrease the queue-limit for the mission-critical traffic class.
D) Increase the WRED max-threshold value for the mission-critical traffic class.
E) Enable fair-queue within the mission-critical traffic class.

Solutions: