Cisco 642-642 Actual Tests : Quality of Service (QoS)

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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

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

2. DRAG DROP
Drop

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

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

5. A Cisco Catalyst switch has an IP phone connected to its Fastethernet0/2 port. The IP phone has an attached PC. The Fastethernet0/2 port on the switch has been configured with the commands mls qos trust cos, mls qos trust device cisco-phone, and switchport priority extend trust.
What will happen to a data frame with a CoS of 5 that is sent from the PC through the IP phone to port Fastethernet0/2 on the switch?

A) The IP phone will allow the data packet through without modifying theCoS settings of the data frame.
B) The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.
C) The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.
D) While the packet will pass through the IP phone without modification, the switch will, by default, override theCoS priority with the switch default CoS priority.

Solutions: