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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

Based on the configuration, which two statements are true? (Choose two.)
Policy-map shape-cbwfq
Class interactive
Shape average 256000
Shape adaptive 128000
Bandwidth 128

A. If the interactive traffic class exceeds an average rate of 256 kbps, the traffic rate will be throttled down to 128 kbps.
B. The interactive traffic class will have a minimum bandwidth guarantee of 256 kbps.
C. The interactive traffic class will have a maximum bandwidth guarantee of 256 kbps.
D. This configuration allows class-based traffic shaping to lower the traffic rate in response to the BECN bit.
E. The interactive traffic class will have a min-rate (min-cir) of 128 kbps.

Question 2

Refer to the exhibit. Which three statements are true about the configuration? (Choose three.)
class-map class-1
match ip rtp 2024 1000
class-map class 2
match dscp 5 6 7
policy-map access-group-1-traffic
class class-1
shape peak 16000
class class-2
police 8000 1000
conform-action set-dscp-transmit 1
exceed-action set-dscp-transmit 0
violate-action drop
class class-default
fair-queue 16
queue-limit 20
interface fastethernet 0/0
service-policy output access-group1-traffic

A. IP traffic (DSCP 0) that is sent on fastethernet 0/0 will be subject to fair queuing.
B. IP traffic (DSCPs 1, 2, 3, and 4) that is sent on fastethernet 0/0 are considered to have a violate status and are dropped.
C. Traffic that is subject to shaping can burst up to 32,000 bps.
D. IP traffic (DSCPs 5, 6, and 7) that is sent on fastethernet 0/0 will be traffic policed.
E. RTP traffic (ports 2024 and 1000) that is sent on fastethernet 0/0 will be traffic shaped.
F. Traffic that is subject to policing will have the DCSP set to 0 if the rate exceeds 1000 bps.

Question 3

DRAG DROP

Question 4

Which command is needed to correct the following configurations in order to enable ppp multilink
LFI on the s0/0 interface?
interface Serial0/0
ip address 10.1.1.1 255.255.255.0
encapsulation ppp
no fair-queue
ppp multilink
multilink-group 2001100114
!
interface Multilink2001100114
bandwidth 384
ip address 10.1.1.1 255.255.255.0
service-policy output AutoQoS-Policy-UnTrust
ppp multilink
ppp multilink fragment-delay 10
ppp multilink interleave

A. the no ip address command on the s0/0 interface
B. the ppp multilink interleave command on the s0/0 interface
C. the ppp multilink load-threshold command on the Multilink2001100114 interface
D. the multilink-group 2001100114 command on the Multilink2001100114 interface
E. the ppp multilink load-threshold command on the s0/0 interface

Question 5

The following commands have been configured under the fa0/1 interface on the 2950 switch:
wrr-queue bandwidth 20 1 80 0
mls qos trust cos
mls qos trust device cisco-phone
Voice traffic from the IP phone that is directly connected to the fa0/1 interface is experiencing excessive delays. What could be the cause of this problem?

A. The default cos-to-dscp map is being used.
B. The trust boundary configuration is not correct.
C. The default wrr-queue cos-map is being used.
D. The default dscp-to-cos map is being used.
E. The wrr-queue bandwidth weightings are not correct.

Solutions: