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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Congestion Avoidance | - Random Early Detection (RED, WRED) |
| Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Classification and Marking | - Packet marking (DSCP, CoS, IP Precedence) - Traffic classification methods |
| QoS Fundamentals | - QoS models and architectures (Best Effort, IntServ, DiffServ) - Introduction to Quality of Service concepts |
| Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| QoS Implementation on Cisco Devices | - Modular QoS CLI (MQC) configuration - End-to-end QoS deployment considerations |
| Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
Cisco Quality of Service (QoS) Sample Questions:
Question 1
What describes the use of best-effort service with overprovisioning?
A. ensuring availability and quality of service by always provisioning key services across at least two service provider networks
B. ensuring quality of service by providing more than the aggregate bandwidth required
C. ensuring constant availability by provisioning multiple paths through the network
D. ensuring quality of service by deploying sophisticated prioritization and congestion management mechanisms
E. ensuring quality of service by being able to load balance across links in times of congestion
Question 2
SIMULATION - LAB
A. Please click console
Question 3
What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)
A. increase throughput
B. decrease delay
C. increase link speed
D. decrease jitter
E. decrease propagation delay
Question 4
Which two different traffic types have the most similar sensitivity to latency, jitter, and packet loss? (Choose two.)
A. peer-to-peer file sharing
B. SQL transactions
C. voice
D. streaming video
E. voice signaling
F. video conferencing
Question 5
SIMULATION - LAB
A. Please click console
Solutions:
| Question 1 Answer: B | Question 2 Answer: A | Question 3 Answer: A,B,D | Question 4 Answer: C,F | Question 5 Answer: A |
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