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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

Which two values influence how the fragment size should be set when configuring FRF.12? (Choose two.)

A. the physical interface port speed
B. the CIR of the PVC
C. the Voice over IP (VoIP) packet size
D. the software queuing method
E. the dual FIFO Frame Relay interface queue size

Question 2

When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)

A. mls qos trust device cisco-phone
B. mls qos trust cos
C. mls qos trust extend [cos value]
D. no mls qos trust dscp
E. mls qos cos 5
F. switchport priority extend trust

Question 3

Mission-critical traffic is not getting a minimum bandwidth of 192 kbps in this policy-map configuration. What should be done to correct the problem?
policy-map test class mission-critical bandwidth 192 shape average 128000 queue-limit 64

A. Use the shape peak command instead of the shape average command.
B. Decrease the maximum queue size for the mission-critical traffic class using the queue-limit 40 command.
C. Increase the maximum queue size for the mission-critical traffic class using the queue-limit 128 command.
D. Replace the bandwidth statement with the priority 192 command.
E. Set the shape rate to a CIR that is higher than 192 kbps.
F. Change the bandwidth statement to the bandwidth 192000 command.

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

Question 5

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

Solutions: