PDF Version DemoCisco CCIP 642-642 Quality of Service (QoS) Exams
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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| QoS Fundamentals | - Introduction to Quality of Service concepts - QoS models and architectures (Best Effort, IntServ, DiffServ) |
| Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Classification and Marking | - Traffic classification methods - Packet marking (DSCP, CoS, IP Precedence) |
| Congestion Avoidance | - Random Early Detection (RED, WRED) |
| Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
| QoS Implementation on Cisco Devices | - Modular QoS CLI (MQC) configuration - End-to-end QoS deployment considerations |
| Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
Cisco Quality of Service (QoS) Sample Questions:
Question #1
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 wrr-queue bandwidth weightings are not correct.
B. The default cos-to-dscp map is being used.
C. The trust boundary configuration is not correct.
D. The default dscp-to-cos map is being used.
E. The default wrr-queue cos-map is being used.
Question #2
When configuring WFQ, what is the default number of dynamic queues based on?
A. hash of the packet headers
B. hold-queue limit
C. drop probability denominator
D. interface bandwidth
E. congestive discard threshold (CDT)
F. inter-packet arrival rate
Question #3
Traffic classification using NBAR is configured using which IOS command?
A. router(config-if)# ip nbar protocol-discovery
B. router(config)# ip nbar port-map {protocol} [tcp|udp] {port-number} {port-number} ....
C. router(config-cmap)# match protocol {protocol-name}
D. router(config)# ip nbar pdlm {pdlm-file}
Question #4
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. Set the shape rate to a CIR that is higher than 192 kbps.
B. Replace the bandwidth statement with the priority 192 command.
C. Increase the maximum queue size for the mission-critical traffic class using the queue-limit 128 command.
D. Use the shape peak command instead of the shape average command.
E. Change the bandwidth statement to the bandwidth 192000 command.
F. Decrease the maximum queue size for the mission-critical traffic class using the queue-limit 40 command.
Question #5
DRAG DROP
Solutions:
| Question #1 Correct Answer: E | Question #2 Correct Answer: D | Question #3 Correct Answer: C | Question #4 Correct Answer: A | Question #5 Correct Answer: Only visible for members |
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