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Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Congestion Management | 20% | - Priority queuing and bandwidth allocation - Queuing algorithms: WFQ, CBWFQ, LLQ |
| Congestion Avoidance & Link Efficiency | 10% | - WRED, RED - Fragmentation, Compression, LFI |
| Traffic Policing and Shaping | 15% | - Shaping: GTS, FRTS, CB-Shaping - Policers: single-rate, two-rate |
| Modular QoS CLI (MQC) and AutoQoS | 15% | - AutoQoS for Enterprise and VoIP - Class-maps, Policy-maps, Service-policy |
| Classification and Marking | 20% | - Marking mechanisms and trust boundaries - Layer 2 and Layer 3 classification - NBAR, ACL-based classification |
| IP QoS Fundamentals and Models | 20% | - QoS models: Best-Effort, IntServ, DiffServ - DSCP, IP Precedence, CoS, MPLS EXP marking - Need for QoS in converged networks |
Cisco Quality of Service (QoS) Sample Questions:
Based on the following show output, which statement is true?
WG1S1#sh mls qos interface fa0/1 FastEthernet0/1 trust state: not trusted trust mode: trust cos COS override: dis default COS: 0 pass-through: none trust device: cisco-phone
- A. DSCP markings from the Cisco IP Phone are trusted.
- B. A Cisco IP Phone is not connected to the fa0/1 switch port.
- C. All incoming DSCP markings are trusted.
- D. All incoming CoS markings are trusted.
Explanation: Only visible for Pass4sures members. You can sign-up / login (it's free).
Which QoS mechanism calculates the mean queue depth to determine its operation?
- A. class-based policing
- B. LLQ/CBWFQ
- C. class-based shaping
- D. WFQ
- E. WRED
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When configuring WFQ, what is the default number of dynamic queues based on?
- A. drop probability denominator
- B. congestive discard threshold (CDT)
- C. inter-packet arrival rate
- D. interface bandwidth
- E. hold-queue limit
- F. hash of the packet headers
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Based on the configuration, which two of the following statements are true? (Choose two.)
policy-map police 1
class bulk-ftp
police cir percent 20 pir percent 40
conform-action set-dscp-transmit af11
exceed-action set-dscp-transmit 0
violate-action drop
- A. This configuration will use a single token bucket.
- B. This is a dual-rate, class-based policing example.
- C. This is a multi-action, class-based policing example.
- D. This configuration will drop all exceeding traffic.
- E. This is a percentage-based policing example.
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Based on the following policy-map configuration, the bulk traffic class packets are not being ECN
marked, yet there are many random drops in the bulk traffic class. What is the most likely cause of
the problem?
router(config)# policy-map MyPolicy
router(config-pmap)# class bulk
router(config-pmap)# bandwidth 128
router(config-pmap-c)# random-detect dscp-based
router(config-pmap-c)# random-detect dscp af31 32 40 10
router(config-pmap-c)# random-detect dscp af32 28 40 10
router(config-pmap-c)# random-detect dscp af33 24 40 10
router(config-pmap-c)# random-detect ecn
- A. The CB-WRED min threshold is set too low.
- B. Some of the routers within the traffic path are not ECN capable.
- C. The CB-WRED mark probability denominator is set too low.
- D. The endpoints generating the bulk traffic packets are not ECN capable.
- E. The CB-WRED max threshold is set too high.
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