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Cisco Quality of Service (QoS) Sample Questions:

1. Which mechanism is used for the prioritizing, protection, and isolation of traffic based on marking?

A) shaping
B) metering
C) congestion avoidance
D) classification and marking
E) congestion management
F) policing

2. Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of commands shown below, where does the trust boundary lie?
interface fa0/2 mls qos trust cos mls qos trust device cisco-phone switchport voice vlan 112

A) between the access layer switch and the distribution layer switch
B) between the IP phone and the PC
C) between the IP phone and the switch
D) between the PC port and the LAN port on the IP phone

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

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

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

5. QoS policy propagation through BGP (QPPB) supports which two QoS markers? (Choose two.)

A) MPLS EXP
B) COS
C) QoS group
D) IP precedence
E) DSCP

Solutions: