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Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Congestion Avoidance & Link Efficiency | 10% | - WRED, RED - Fragmentation, Compression, LFI |
| Modular QoS CLI (MQC) and AutoQoS | 15% | - Class-maps, Policy-maps, Service-policy - AutoQoS for Enterprise and VoIP |
| Traffic Policing and Shaping | 15% | - Policers: single-rate, two-rate - Shaping: GTS, FRTS, CB-Shaping |
| Congestion Management | 20% | - Queuing algorithms: WFQ, CBWFQ, LLQ - Priority queuing and bandwidth allocation |
| Classification and Marking | 20% | - NBAR, ACL-based classification - Layer 2 and Layer 3 classification - Marking mechanisms and trust boundaries |
| IP QoS Fundamentals and Models | 20% | - DSCP, IP Precedence, CoS, MPLS EXP marking - QoS models: Best-Effort, IntServ, DiffServ - Need for QoS in converged networks |
Cisco Quality of Service (QoS) Sample Questions:
The show policy-map interface command output is showing too many random drops for the mission-critical traffic class. What can be changed to reduce the random drops?
- A. Increase the WRED max-threshold value for the mission-critical traffic class.
- B. Decrease the WRED drop probability denominator for the mission-critical traffic class.
- C. Increase the WRED min-threshold value for the mission-critical traffic class.
- D. Decrease the queue-limit for the mission-critical traffic class.
- E. Enable fair-queue within the mission-critical traffic class.
Correct Answer: C 🗳️
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Where is the fragment size configured when using FRF.12 link fragmentation and interleaving?
- A. within the MQC policy-map
- B. within the MQC service-policy
- C. within the Frame Relay map-class
- D. within the physical serial interface
- E. within the MQC class-map
- F. within the logical multilink interface
Correct Answer: C 🗳️
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Refer to the exhibit. A service provider is considering several alternative provisioning schemes for a new network. One proposed scheme involves aggregating 10-Mbps links from customers into a network with multiple 100-Mbps links to ensure that the network links have at least two times the capacity of the aggregate of the customer links.
What is the most appropriate description for the proposed scheme?
- A. Bandwidth-on-Demand
- B. overaggregate
- C. CIR of 0
- D. overprovisioning
- E. oversubscription
Correct Answer: D 🗳️
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What describes the use of best-effort service with overprovisioning?
- A. ensuring quality of service by being able to load balance across links in times of congestion
- B. ensuring quality of service by deploying sophisticated prioritization and congestion management mechanisms
- C. ensuring quality of service by providing more than the aggregate bandwidth required
- D. ensuring availability and quality of service by always provisioning key services across at least two service provider networks
- E. ensuring constant availability by provisioning multiple paths through the network
Correct Answer: C 🗳️
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