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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Introduction to Quality of Service | - QoS models and architectures - Traffic classification and marking concepts - QoS concepts and requirements |
| Congestion Avoidance | - Random Early Detection - Weighted Random Early Detection |
| Classification and Marking | - Network-based application recognition and classification - Layer 2 and Layer 3 marking - Modular QoS CLI classification and marking |
| QoS for Voice and Video Applications | - IP telephony QoS design considerations - Voice traffic requirements - End-to-end QoS deployment |
| Link Efficiency Mechanisms | - Link fragmentation and interleaving - Compression technologies |
| QoS Management and Implementation | - QoS monitoring and troubleshooting - QoS policy configuration and verification - QoS deployment considerations |
| Congestion Management | - Queuing mechanisms - Low Latency Queuing - Class-Based Weighted Fair Queuing |
Cisco Quality of Service (QoS) Sample Questions:
1. Which QoS mechanism calculates the mean queue depth to determine its operation?
A) class-based shaping
B) WRED
C) LLQ/CBWFQ
D) WFQ
E) class-based policing
2. Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)
A) random-detect dscp-based
B) random-detect ecn
C) shape peak {bps}
D) bandwidth {kbps}
E) priority {kbps}
F) compress header ip rtp
3. HOTSPOT
4. HOTSPOT
5. When LLQ is being configured, which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?
A) priority
B) queue-limit
C) hold-queue
D) bandwidth
E) police
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: E,F | Question # 3 Answer: Only visible for members | Question # 4 Answer: Only visible for members | Question # 5 Answer: E |
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