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Cisco 642-642 Exam Syllabus Topics:

Section	Objectives
Topic 1: Link Efficiency Mechanisms	- Fragmentation and interleaving (LFI, MLP QoS concepts)
Topic 2: Congestion Avoidance	- Random Early Detection (RED, WRED)
Topic 3: QoS Implementation on Cisco Devices	- End-to-end QoS deployment considerations - Modular QoS CLI (MQC) configuration
Topic 4: Traffic Policing and Shaping	- Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases
Topic 5: QoS Fundamentals	- Introduction to Quality of Service concepts - QoS models and architectures (Best Effort, IntServ, DiffServ)
Topic 6: Classification and Marking	- Traffic classification methods - Packet marking (DSCP, CoS, IP Precedence)
Topic 7: Congestion Management	- Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ)

Cisco Quality of Service (QoS) Sample Questions:

1. Based on the Cisco Catalyst 2950 Series switch configuration shown, with no weights being
assigned to the egress queues, which type of queuing is being implemented?
wrr-queue cos-map 1 0
wrr-queue cos-map 2 1 2 3
wrr-queue cos-map 3 4 5
wrr-queue cos-map 4 6 7

A) modified deficit round robin
B) custom
C) priority
D) weighted fair
E) weighted round robin with an expedite queue
F) weighted round robin

2. At the network layer, IP packets are typically classified based on which three items? (Choose three.)

A) source and destination IP addresses
B) content of the ToS byte
C) VLAN Identifier
D) flow control bits
E) packet length

3. What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)

A) decrease delay
B) increase link speed
C) decrease propagation delay
D) increase throughput
E) decrease jitter

4. HOTSPOT