Exam Code: 642-642

Course Name: Quality of Service Exam

Vendor: Cisco

Passing Score: 825

Quality of Service Exam, also known as 642-642 exam, is a Cisco certification. The 642-642 exam is for those IT Professionals who want to have a bright future in the IT industry. The networking professionals do the Cisco certifications to acquire more and more out of their existing jobs. These days in IT world you have to be certified in order to play a vital role in any company. When you enter into the Cisco field of study, you will be skilled at using the Cisco technology. Becoming a Cisco certified professional means that you have verified your expertise in the virtual field which improves your chances of getting better jobs, as well as, the potential employers' strong trust in your capabilities. The Tech firms also demand for such IT Professionals trained in Cisco certification.

The 642-642 exam is comprised of two parts: first part is that of CVoice and second part is about QoS. In the first part, it introduces you to Packet Voice Technologies as well as Analog and Digital Voice Connections. It also enables you to configure Voice Interfaces. This Cisco certification helps you improve and maintain Voice Quality and identify scalable numbering and applications. Whereas, the second part of this Cisco exam introduces you to IP QoS and Modular QoS CLI and Auto-QoS. The 642-642 exam provides you wirth the technical knowledge and skills to identify the Building Blocks of IP QoS. In order to be capable of Classification and Marking, Congestion Management, Congestion Avoidance, Link Efficiency best Mechanisms, Traffic Policing and Shaping, and QoS best practices, you must take 642-642 exam.

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C ourse Outline: Quality of Service Exam

IP QoS Fundamentals

Given a description of a converged network, identify problems that could lead to poor quality of service and explain how the problems might be resolved

Define the term Quality of Service (QoS) and identify and explain the key steps to implementing QoS on a converged network

IP QoS Components

List and explain the models for providing Quality of Service on a network

Explain the purpose and function of the DiffServ model

Describe the basic format of and explain the purpose of the DSCP field in the IP header

Define and explain the different per hop behaviors used in DSCP

Explain the interoperability between DSCP-based and IP-precedence-based devices in a network

Given a list of QoS actions, correctly match the QoS actions to mechanisms for implementing QoS and identify where in a network the different QoS mechanisms are commonly used

Modular QoS CLI and Auto-QoS

Given a network requiring QoS, explain how to implement a QoS policy using MQC

Explain how AutoQoS is used to implement QoS policy

Classification and Marking

Explain how link layer and network layer markings are used to define service classes and the different applications represented by each of these service classes

Given a network and a description of QoS issues, use MQC CLI commands to classify packets

Given a network and a description of QoS issues, use class-based marking to assign packets to a specific service class

Describe the function of Network Based Application Recognition

Describe the purpose of pre-classification to support QoS in various VPN (IPSEC, GRE, L2TP) configurations

Describe QoS trust boundaries and their significance in LAN based classification and marking

Identify the different classification and marking options available on Cisco L2 and L3 switching platforms

Congestion Management Methods

List and explain the different queuing algorithms

Explain the components of hardware and software queuing systems on Cisco routers and how they are effected by tuning and congestion

Describe the benefits and drawbacks of using WFQ to implement QoS

Explain the purpose and features of Class-Based WFQ (CBWFQ)

Explain the purpose and features of Low Latency Queuing (LLQ)

Identify the Cisco IOS commands required to configure and monitor LLQ on a Cisco router

Describe and explain the different queuing capabilities available on the Cisco Catalyst 2950 Switch

Congestion Avoidance Methods

Describe the drawbacks tail drop as a congestion control mechanism

Describe the elements of a RED traffic profile

Describe Weighted Random Early Detection and how it can be used to prevent congestion

Identify the Cisco IOS commands required to configure and monitor DSCP-based CB-WRED

Explain how ECN interacts with WRED in Cisco IOS

Traffic Policing and Shaping

Describe the purpose of traffic conditioning using traffic policing and traffic shaping and differentiate between the features of each

Explain how network devices measure traffic rates using single rate or dual rate, single or dual token bucket mathematical models

Identify the Cisco IOS commands required to configure and monitor single rate and dual rate CB-Policing

Identify the Cisco IOS commands required to configure and monitor percentage based CB-Policing

Explain how the two rate limits, average rate and peak rate, can be used to rate limit traffic

Identify the Cisco IOS commands required to configure and monitor CB-Shaping

Identify the Cisco IOS commands required to configure and monitor Frame Relay adaptive CB-Shaping on Frame Relay interfaces

Link Efficiency Mechanisms

Explain the various link efficiency mechanisms and their function

Identify the Cisco IOS commands required to configure and monitor CB header compression

Given a list of link speeds and a specific delay requirement, determine the proper fragment size to use at each link speed and identify the typical delay requirement for VoIP packets

Identify the Cisco IOS commands required to configure and monitor Multilink PPP with Interleaving

Identify the Cisco IOS commands required to configure and monitor FRF.12

QoS Best Practices

Explain the QoS requirements of the different application types

List typical enterprise traffic classes then identify the delay, jitter, packet loss and bandwidth requirements of each traffic class

Explain the best practice QoS implementations and configurations within the campus LAN

Explain the best practice QoS implementations and configurations on the WAN customer edge (CE) and provider edge (PE) routers