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

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

3. This policy-map is applied to a 128-kbps serial interface in the output direction. Which set of additional commands within this policy-map will improve the link efficiency on the serial interface?
policy-map test
class voice
priority 25
class telnet
bandwidth remaining percent 20
class ftp
bandwidth remaining percent 30

A) class voice
no priority 25
bandwidth percent remaining 25
B) class ftp
compression header ip
C) class voice
compression header ip tcp
D) class telnet
compression header ip tcp
E) class telnet
fair-queue
F) class ftp
fair-queue

4. What is the purpose of the qos pre-classify command?

A) to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header
B) to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header
C) to enable class-based marking on IPSec crypto maps
D) to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header
E) to enable class-based marking on tunnel interface
F) to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header

5. Refer to the exhibit. A typical configuration involving an IP phone with an attached PC is shown. According to QoS recommendations, at which demarcation line (shown as dotted lines) would the trust boundary normally exist?

A) B
B) D
C) C
D) A

Solutions: