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Cisco 642-642 Exam Syllabus Topics:

Section	Objectives
Topic 1: Introduction to Quality of Service	- QoS models and architectures - Traffic classification and marking concepts - QoS concepts and requirements
Topic 2: Link Efficiency Mechanisms	- Compression technologies - Link fragmentation and interleaving
Topic 3: QoS Management and Implementation	- QoS deployment considerations - QoS monitoring and troubleshooting - QoS policy configuration and verification
Topic 4: Congestion Avoidance	- Weighted Random Early Detection - Random Early Detection
Topic 5: QoS for Voice and Video Applications	- IP telephony QoS design considerations - End-to-end QoS deployment - Voice traffic requirements
Topic 6: Congestion Management	- Class-Based Weighted Fair Queuing - Low Latency Queuing - Queuing mechanisms
Topic 7: Classification and Marking	- Network-based application recognition and classification - Modular QoS CLI classification and marking - Layer 2 and Layer 3 marking

Cisco Quality of Service (QoS) Sample Questions:

Question #1

Which three characteristics are drawbacks to the use of a best-effort with over-provisioning backbone design? (Choose three.)

A. It requires complex QoS mechanisms at the network core.
B. Denial of Service attacks on one service can affect all network traffic.
C. It requires complex QoS mechanisms at the network edge.
D. The design uses a different over-provisioning ratio for the different traffic classes.
E. The design costs more to implement than a DiffServ backbone.
F. Unplanned network failures can cause unexpected congestion in the network.

Reveal Solution Discussion 0

Correct Answer: B,E,F 🗳️

Question #2

Refer to the exhibit. Why would applying the limit-interactive policy-map to the fa0/0 interface as shown below cause an error?
interface fa0/0 service-policy input limit-interactive

A. The interactive traffic class is missing the bandwidth {kbps} command.
B. Class-based policing can only be applied in the output direction.
C. TCP header compression can only be applied in the output direction.
D. The interactive class-map has not been configured.
E. There is already an output service-policy defined on the fa0/0 interface.

Reveal Solution Discussion 0

Correct Answer: C 🗳️

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Question #3

Refer to the exhibit. A typical configuration involving an IP phone with an attached PC is shown. According to QoS recommendations, at which demarcation line (shown as dotted lines) would the trust boundary normally exist?