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Cisco 642-642 Exam Syllabus Topics:

Section	Weight	Objectives
Congestion Management	20%	- Priority queuing and bandwidth allocation - Queuing algorithms: WFQ, CBWFQ, LLQ
IP QoS Fundamentals and Models	20%	- QoS models: Best-Effort, IntServ, DiffServ - Need for QoS in converged networks - DSCP, IP Precedence, CoS, MPLS EXP marking
Classification and Marking	20%	- NBAR, ACL-based classification - Marking mechanisms and trust boundaries - Layer 2 and Layer 3 classification
Congestion Avoidance & Link Efficiency	10%	- WRED, RED - Fragmentation, Compression, LFI
Modular QoS CLI (MQC) and AutoQoS	15%	- Class-maps, Policy-maps, Service-policy - AutoQoS for Enterprise and VoIP
Traffic Policing and Shaping	15%	- Shaping: GTS, FRTS, CB-Shaping - Policers: single-rate, two-rate

Cisco Quality of Service (QoS) Sample Questions:

Question 1

What will be the peak shape rate based on the configuration that follows?
policy-map setpeak
class all-traffic
shape peak 32000

A. 16000 bps
B. 96000 bps
C. 32000 bps
D. 80000 bps
E. 64000 bps
F. 48000 bps

Question 2

The show policy-map interface command output is showing too many random drops for the mission-critical traffic class. What can be changed to reduce the random drops?

A. Enable fair-queue within the mission-critical traffic class.
B. Increase the WRED max-threshold value for the mission-critical traffic class.
C. Increase the WRED min-threshold value for the mission-critical traffic class.
D. Decrease the WRED drop probability denominator for the mission-critical traffic class.
E. Decrease the queue-limit for the mission-critical traffic class.

Question 3

Where is the error in the following policy-map configuration?
policy-map test class voice priority 168 class mission-critical bandwidth 192 random-detect class class-default fair-queue bandwidth 128

A. The mission-critical traffic class bandwidth guarantee should be lower than the voice traffic class priority bandwidth guarantee.
B. The bandwidth command is not a valid command for the class-default traffic class in this case.
C. The mission-critical traffic class is missing the queue-limit command.
D. The voice traffic class is missing the random-detect command.
E. Fair-queue should be enabled for the mission-critical traffic class.

Question 4

Where is the fragment size configured when using FRF.12 link fragmentation and interleaving?

A. within the MQC service-policy
B. within the physical serial interface
C. within the MQC class-map
D. within the logical multilink interface
E. within the MQC policy-map
F. within the Frame Relay map-class

Question 5

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