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Exam: Cisco 642-642
Title:Quality of Service (QOS)

Version : Demo
1. SIMULATION Simulation Exhibit:

You are working as a network administrator at Certkiller .com. You are required to configure the Certkiller 1 WAN edge router: you must configure the appropriate MQC based queuing mechanism for the outbound traffic to the WAN (S0/0) so that the following bandwidth requirements will be met. A strict priority queue with a 168 Kbps bandwidth guarantee for the class voice is reserved, a minimum bandwidth guarantee of 30 Kbps is configured for the class interactive, a minimum bandwidth guarantee of 16 Kbps for class bulk, and the default class is configured for WFQ with no bandwidth guarantee. In addition, also limit the bulk traffic class to an average rate of 24 Kbps by buffering excess traffic (use the IOS default Bc and Be). In addition, also limit the bulk traffic class to an average rate of 24 Kbps by buffering excess traffic (use the IOS default Bc and Be).
* Use a policy-map called “IIq-policy” and reference the existing class-maps already configured on the Certkiller 1 router. Traffic Class Name Bandwidth Guarantee voice 168 Kbps maximum (use the IOS default burst value) interactive 30 Kbps minimum bulk 16 Kbps minimum (For the bulk traffic class, also limit the traffic to an average rate of 24 Kbps by buffering excess traffic (use the IOS default Bc and Be)) class-default Weighted Fair Queue with no bandwidth guarantee

Simulation Output exhibit #2.

Answer:
Certkiller 1(config)#policy-map llq-policy
Certkiller 1(config-pmap)#class voice
Certkiller 1(config-pmap-c)#priority 168
Certkiller 1(config-pmap-c)#class interactive
Certkiller 1(config-pmap-c)#bandwidth 30
Certkiller 1(config-pmap-c)#class bulk
Certkiller 1(config-pmap-c)#bandwidth 16
Certkiller 1(config-pmap-c)#shape average 2400
Certkiller 1(config-pmap-c)#class class-default
Certkiller 1(config-pmap-c)#fair-queue
Certkiller 1(config-pmap-c)#interface serial 0/0
Certkiller 1(config-if)#service-policy output llq-policy
Certkiller 1(config-if)#end
Certkiller 1#copy running-config startup-config

2. Command exhibit: mis qos trust pass-through dscp Your apprentice Certkiller is configuring a Catalyst 2950 Switch. What is the purpose of the command she is submitting (see exhibit)?
A. The command configures a port to trust the incoming CoS and not modify the incoming DSCP when sending the frame out.
B. The command configures a port to trust the incoming CoS and to generate the internal DSCP based on the incoming CoS. The internalr DSCP will then determine the gress DSCP.
C. The command configures a port to trust the incoming CoS and DSCP values.
D. The command configures a port to trust the incoming CoS and to generate the internal DSCP based on the incoming DSCP. The internal DSCP will then determine the egress DSCP.
E. The command configures a port to trust the incoming CoS and bypass the CoS-to-DSCP maps for generating the internal DSCP.
F. The command configures a port to trust the incoming CoS and bypass the DSCP-to-CoS maps for generating the egress CoS.
Answer: A
3. Which of the following is most likely to occur for voice in the absence of QoS? (Choose all that apply.)
A. choppy speech
B. words out of order due to recovery
C. disconnect calls
D. unsynchronized voice patterns
E. softer volume speech
Answer: AC
4. What are the benefits, as listed in the DQOS course, for Enterprise Networks when QoS is implemented? (Choose all that apply.)
A. It decreases propagation delay.
B. It provides predictable response times.
C. It prevents the need to increase bandwidth.
D. It supports dedicated bandwidth per application.
E. It maximizes loss during bursty congestion.
Answer: BD
5. Which two components are associated with the DiffServ model? (Choose two.)
A. hop-by-hop signaling
B. per-hop behavior
C. RSVP
D. Hard QoS
E. DSCP use of class selector
Answer: BE
The related exam:642-611 and 642-502

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The related exam:642-104

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related exam:642-611
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