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Cisco Quality of Service (QoS) Sample Questions:

1. DRAG DROP
Drop

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

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

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

5. Based on the following show output, which statement is true?
WG1S1#sh mls qos interface fa0/1 FastEthernet0/1 trust state: not trusted trust mode: trust cos COS override: dis default COS: 0 pass-through: none trust device: cisco-phone

A) All incoming DSCP markings are trusted.
B) DSCP markings from the Cisco IP Phone are trusted.
C) All incoming CoS markings are trusted.
D) A Cisco IP Phone is not connected to the fa0/1 switch port.

Solutions: