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Cisco Quality of Service (QoS) Sample Questions:

1. Based on the following policy-map configuration, the bulk traffic class packets are not being ECN
marked, yet there are many random drops in the bulk traffic class. What is the most likely cause of
the problem?
router(config)# policy-map MyPolicy
router(config-pmap)# class bulk
router(config-pmap)# bandwidth 128
router(config-pmap-c)# random-detect dscp-based
router(config-pmap-c)# random-detect dscp af31 32 40 10
router(config-pmap-c)# random-detect dscp af32 28 40 10
router(config-pmap-c)# random-detect dscp af33 24 40 10
router(config-pmap-c)# random-detect ecn

A) Some of the routers within the traffic path are not ECN capable.
B) The CB-WRED max threshold is set too high.
C) The CB-WRED mark probability denominator is set too low.
D) The endpoints generating the bulk traffic packets are not ECN capable.
E) The CB-WRED min threshold is set too low.

2. HOTSPOT

3. HOTSPOT

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 software queuing method
D) the physical interface port speed
E) the CIR of the PVC

5. 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-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.
C) LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.
D) CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.

Solutions: