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Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Modular QoS CLI (MQC) and AutoQoS | 15% | - Class-maps, Policy-maps, Service-policy - AutoQoS for Enterprise and VoIP |
| Classification and Marking | 20% | - Layer 2 and Layer 3 classification - NBAR, ACL-based classification - Marking mechanisms and trust boundaries |
| Congestion Management | 20% | - Priority queuing and bandwidth allocation - Queuing algorithms: WFQ, CBWFQ, LLQ |
| 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 |
| Congestion Avoidance & Link Efficiency | 10% | - Fragmentation, Compression, LFI - WRED, RED |
| Traffic Policing and Shaping | 15% | - Policers: single-rate, two-rate - Shaping: GTS, FRTS, CB-Shaping |
Cisco Quality of Service (QoS) Sample Questions:
Question 1
SIMULATION - LAB
A. Please click console
Question 2
Based on the following Cisco Catalyst 2950 Series switch configurations, which additional command will enable these actions?
Traffic marked with a CoS of 6 or 7 will be serviced by the priority queue.
Traffic marked with a CoS of 0, 1, or 2 will have a 20-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 4 will have a 30-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 3 or 5 will have a 50-percent weight when serviced by the wrr queue.
Catalyst 2950 partial configuration:
no wrr-queue cos-map
wrr-queue cos-map 1 0 1 2
wrr-queue cos-map 2 4
wrr-queue cos-map 3 3 5
wrr-queue cos-map 4 6 7
A. wrr-queue bandwidth 1 10 15 25
B. wrr-queue bandwidth 1 20 30 50
C. wrr-queue bandwidth 15 25 10 1
D. wrr-queue bandwidth 10 15 25 0
E. wrr-queue bandwidth 15 25 10 0
Question 3
DRAG DROP
Drop
Question 4
HOTSPOT
Question 5
Which of the following configurations requires the use of hierarchical policy maps?
A. the use of nested class-maps with class-based marking
B. the use of a strict priority-class queue within CBWFQ
C. the use of both the bandwidth and shape statements within a CBWFQ class queue
D. the use of class-based WRED within a CBWFQ class queue
E. the use of CBWFQ inside class-based shaping
Solutions:
| Question 1 Answer: A | Question 2 Answer: D | Question 3 Answer: Only visible for members | Question 4 Answer: Only visible for members | Question 5 Answer: E |
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