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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. In an unmanaged CE router implementation, how does the service provider enforce the SLA?

A) by using class-based policing on the CE to PE link to limit the customer's input rate
B) by using class-based random discard on the CE to PE link to limit the customer's input rate
C) by marking on the CE to PE link and using class-based policing on the PE to P link
D) by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link

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

3. A major media company recently deployed a new converged network. The original network design used separate networks for graphics and video, interactive data, and voice. The company has been experiencing problems with voice traffic in the new converged network. Most of the time voice quality is perfectly acceptable. Periodically voice quality exhibits unacceptable choppy voice signals, and occasionally calls are dropped. At this time the company is not willing to simply add bandwidth to the network.
Which QoS solution would most likely help to resolve the problem?

A) Use advanced technologies to compress all video and graphics traffic on the network.
B) Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.
C) Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.
D) Use TCP header compression and LFI to reduce delays.

4. What are three methods of reducing delay for critical applications in a converged network? (Choose three.)

A) Apply header compression.
B) Apply payload compression.
C) Increase all queue depths.
D) Increase LFI fragment size.
E) Reduce inter-packet gaps.
F) Increase link capacities.

5. 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 multilink-group 2001100114 command on the Multilink2001100114 interface
C) the ppp multilink interleave command on the s0/0 interface
D) the ppp multilink load-threshold command on the Multilink2001100114 interface
E) the ppp multilink load-threshold command on the s0/0 interface

Solutions: