Cisco QOS Exam Certification Guide

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Official self-study test preparation guide for the Cisco QOS 642-642 exam. The official study guide helps you master all the topics on the QOS exam, including

  • QoS ...
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Cisco QOS Exam Certification Guide (IP Telephony Self-Study)

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Official self-study test preparation guide for the Cisco QOS 642-642 exam. The official study guide helps you master all the topics on the QOS exam, including

  • QoS concepts, tools, and architectures
  • Modular QoS CLI (MQC), QoS Policy Manager (QPM), and AutoQoS
  • Classification and marking
  • Congestion management
  • Traffic shaping and policing
  • Congestion avoidance through drop policies
  • Compression tools and link fragmentation and interleaving (LFI) tools for link efficiency
  • LAN QoS
  • QoS best practices

The CCVP certification validates a robust set of skills in implementing, operating, configuring, and troubleshooting a converged IP network. A solid understanding of quality-of-service (QoS) features and implementation is essential for CCVP certification and is also a core component of the CCIP® certification.

Cisco QOS Exam Certification Guide, Second Edition, is a best-of-breed Cisco® exam study guide that focuses specifically on the objectives for the QOS 642-642 exam. Senior instructor and best-selling author Wendell Odom and senior AVVID consultant Michael Cavanaugh share preparation hints and test-taking tips, helping you identify areas of weakness and improve your QoS knowledge. Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics.

Cisco QOS Exam Certification Guide, Second Edition, presents you with an organized test preparation routine through the use of proven series elements and techniques. “Do I Know This Already?” quizzes open each chapter and allow you to decide how much time you need to spend on each section. Exam topic lists and Foundation Summary tables, figures, and snapshot information make referencing easy and give you a quick refresher whenever you need it. Challenging chapter-ending review questions help you assess your knowledge and reinforce key concepts. The companion CD-ROM contains a powerful testing engine that allows you to focus on individual topic areas or take complete, timed exams. The assessment engine also tracks your performance and provides feedback on a module-by-module basis, presenting question-by-question remediation to the text. Well-regarded for its level of detail, assessment features, and challenging review questions and exercises, this book helps you master the concepts and techniques that will enable you to succeed on the exam the first time.

Cisco QOS Exam Certification Guide, Second Edition, is part of a recommended learning path from Cisco Systems® that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press. To find out more about instructor-led training, e-learning, and hands-on instruction offered by authorized Cisco Learning Partners worldwide, please visit

Companion CD-ROM

The companion CD-ROM contains a test bank with more than 300 practice questions, flash card format questions, and an electronic version of the text.

CD-ROM test engine powered by Boson Software is a Cisco Learning Partner.

This volume is part of the Exam Certification Guide Series from Cisco Press®. Books in this series provide officially developed exam preparation materials that offer assessment, review, and practice to help Cisco Career Certification candidates identify weaknesses, concentrate their study efforts, and enhance their confidence as exam day nears.

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Product Details

  • ISBN-13: 9781587201240
  • Publisher: Cisco Press
  • Publication date: 9/17/2004
  • Series: Exam Certification Guide
  • Edition number: 2
  • Pages: 768
  • Product dimensions: 7.56 (w) x 9.42 (h) x 1.88 (d)

Meet the Author

Wendell Odom, CCIE® No. 1624, is a senior instructor with Skyline Advanced Technology Services, where he teaches courses on QoS, CCNA®, and CCIE lab preparation. He has worked in the networking arena for more than 20 years with jobs in pre- and post-sales technical consulting, teaching, and course development.

Michael J. Cavanaugh, CCIE No. 4516, has been in the networking industry for more than 17 years. His current focus is Cisco AVVID implementations, providing convergence consulting, professional services, and technical support.

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Table of Contents


1. QoS Overview.

"Do I Know This Already?" Quiz.

QoS: Tuning Bandwidth, Delay, Jitter, and Loss Questions.

Traffic Characteristics of Voice, Video, and Data Questions.

Planning and Implementing QoS Policies.

Foundation Topics.

QoS: Tuning Bandwidth, Delay, Jitter, and Loss.





Summary: QoS Characteristics: Bandwidth, Delay, Jitter, and Loss.

Traffic Characteristics of Voice, Video, and Data.

Voice Traffic Characteristics.

Video Traffic Characteristics.

Data Traffic Characteristics.

Planning and Implementing QoS Policies.

Step 1: Identify Traffic and Its Requirements.

Step 2: Divide Traffic into Classes.

Step 3: Define Policies for Each Traffic Class.

Foundation Summary.


2. QoS Tools and Architectures.

"Do I Know This Already?" Quiz.

QoS Tools Questions.

Classifying Using Flows or Service Classes Questions.

The Differentiated Services QoS Model Questions.

The Integrated Services QoS Model Questions.

Foundation Topics.

Introduction to IOS QoS Tools.

Classification and Marking.


Shaping and Policing.

Congestion Avoidance.

Link Efficiency.

Call Admission Control.

Classifying Using Flows or Service Classes.

Flow-Based QoS.

Class-Based QoS.

Proper Planning and Marking for Enterprises and Service Providers.

The Differentiated Services QoS Model.

DiffServ Specifications and Terminology.

DiffServ Per-Hop Behaviors.

The Integrated Services QoS Model.

Comparison of the Three QoS Models.

Foundation Summary.


3. MQC, QPM, and AutoQoS.

"Do I Know This Already?" Quiz Questions.

Cisco Modular QoS CLI.

The Cisco QoS Policy Manager.

The Cisco AutoQoS Feature.

Comparisons of CLI, MQC, and AutoQoS.

Foundation Topics.

Cisco Modular QoS CLI.

The Mechanics of MQC.

Classification Using Class Maps.

Performing QoS Actions (PHBs) Using policy-map Commands.

Enabling a Policy Map Using service-policy.

Show Commands for MQC.

QoS Policy Manager (QPM).

SNMP Support for QoS.

Cisco AutoQoS Feature.

AutoQoS VoIP for Routers.

AutoQoS VoIP for Cisco IOS Switches.

AutoQoS VoIP for 6500 Cat-OS.

Comparisons of CLI, MQC, and AutoQoS.

Foundation Summary.

For Further Reading.


4. Classification and Marking.

"Do I Know This Already?" Quiz Questions.

Classification and Marking Concepts Questions.

Classification and Marking Tools Questions.

Classification Issues when Using VPNs Questions.

Foundation Topics.

Classification and Marking Concepts.



Classification and Marking Design Choices.

Classification and Marking Tools.

Class-Based Marking (CB Marking) Configuration.

Miscellaneous Features of Class-Based Marking.

Classification Issues when Using VPNs.

Classification and Marking Before Entering the VPN Tunnel.

Classification and Marking on the Router Creating the VPN Tunnel.

Configuring QoS Pre-classification.

Foundation Summary.

For Further Reading.


5. Congestion Management.

"Do I Know This Already?" Quiz.

Cisco Router Queuing Concepts Questions.

Scheduling Concepts: FIFO, PQ, CQ, and MDRR Questions.

Concepts and Configuration: WFQ, CBWFQ, and LLQ Questions.

Foundation Topics.

Cisco Router Queuing Concepts.

Software Queues and Hardware Queues.

Queuing on Interfaces Versus Subinterfaces and Virtual Circuits (VCs).

Summary of Queuing Concepts.

Scheduling Concepts: FIFO, PQ, CQ, and MDRR.

FIFO Queuing.

Priority Queuing.

Custom Queuing.

Modified Deficit Round-Robin.

Concepts and Configuration: WFQ, CBWFQ, and LLQ.

Weighted Fair Queuing (WFQ).

Class-Based WFQ (CBWFQ).

Low Latency Queuing (LLQ).

Comparisons of WFQ, CBWFQ, and LLQ.

Foundation Summary.

For Further Reading.


6. Traffic Policing and Shaping.

"Do I Know This Already?" Quiz.

Shaping and Policing Concepts Questions.

Configuring Class-Based Shaping.

Configuring Class-Based Policing.

Foundation Topics.

Traffic Policing and Traffic Shaping Concepts.

When and Where to Use Shaping and Policing.

How Shaping Works.

How Policing Works.

Summary of CB Policing Mechanics.

Class-Based Shaping Configuration.

Setting Bc to Tune Tc.

Tuning Shaping for Voice Using LLQ and a Small Tc.

Shaping to a Peak Rate.

Miscellaneous CB Shaping Configuration: Adaptive Shaping.

Miscellaneous CB Shaping Configuration: Shaping by Percent.

Comparing CB Shaping and FRTS.

Class Based Policing Configuration.

Policing a Subset of the Traffic.

Configuring Dual-Rate Policing.

CB Policing Miscellany.

CB Policing Configuration Summary.

Foundation Summary.


7. Congestion Avoidance Through Drop Policies.

"Do I Know This Already?" Quiz.

Congestion-Avoidance Concepts and RED Questions.

WRED Questions.

ECN Questions.

Foundation Topics.

Congestion-Avoidance Concepts and Random Early Detection (RED).

TCP and UDP Reactions to Packet Loss.

Tail Drop, Global Synchronization, and TCP Starvation.

Random Early Detection (RED).

Weighted RED (WRED).

How WRED Weights Packets.

WRED and Queuing.

WRED Configuration.

WRED Summary.

Explicit Congestion Notification.

ECN Concepts.

ECN Configuration.

Foundation Summary.


8. Link Efficiency Tools.

"Do I Know This Already?" Quiz.

Compression Questions.

Link Fragmentation and Interleave Questions.

Foundation Topics.

Payload and Header Compression.

Header Compression.

Class-Based TCP and RTP Header Compression Configuration.

Link Fragmentation and Interleaving.

Multilink PPP LFI.

Frame Relay LFI Using FRF.12.

Multilink PPP Interleaving Configuration.

Frame Relay Fragmentation Configuration.

MLP LFI and FRF.12 Configuration: The Short Version.

Foundation Summary.

Compression Tools.

LFI Tools.


9. LAN QoS.

"Do I Know This Already?" Quiz.

Classification and Marking.

Congestion Management.



Foundation Topics.

The Need for QoS on the LAN.

Buffer Overflow (Overrun).

The Cisco Catalyst 2950.

Classification and Marking.

Layer 2 Header Classification and Marking.

Layer 3 Header Classification and Marking.

Layer 2-to-Layer 3 Mapping.

Trust Boundaries.

Using MQC for Classification and Marking.

Congestion Management.

Strict Priority Scheduling.

WRR Scheduling.

Strict Priority and WRR Scheduling.



Foundation Summary.

For Further Reading.


10. Cisco QoS Best Practices.

"Do I Know This Already?" Quiz.

Foundation Topics.

The Need for QoS Best Practices.

End-to-End QoS.

QoS Service Level Agreements.

Application Requirements for QoS.

Voice Traffic.

Video Traffic.

Data Traffic.

QoS Best Practices Methodology.

Classification and Marking Best Practices.

Congestion Management Best Practices.

Congestion Avoidance Best Practices.

Policing Best Practices.

QoS Case Studies.

Enterprise Campus QoS Implementations.

Enterprise (CE) to Service Provider (PE) WAN QoS Implementations.

Service Provider (PE) to Enterprise (CE) WAN QoS Implementations.

Service Provider Backbone QoS Implementations.

Foundation Summary.

For Further Reading.


Appendix A Answers to the "Do I Know This Already?"

Quizzes and Q & A Sections.

Chapter 1.

"Do I Know This Already" Quiz.


Chapter 2.

"Do I Know This Already" Quiz.


Chapter 3.

"Do I Know This Already" Quiz.


Chapter 4.

"Do I Know This Already" Quiz.


Chapter 5.

"Do I Know This Already" Quiz.

Q&A .

Chapter 6.

"Do I Know This Already" Quiz.


Chapter 7.

"Do I Know This Already" Quiz.


Chapter 8.

"Do I Know This Already" Quiz.


Chapter 9.

"Do I Know This Already" Quiz.

Q&A .

Chapter 10.

"Do I Know This Already" Quiz.



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Customer Reviews

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  • Anonymous

    Posted January 18, 2005

    Good Reference Book

    Cisco QoS Exam Certification Guide (ISBN: 1587201240) by Wendell Odom and Michael J. Cavanaugh is a good book for anyone who needs a reference guide for QoS . The first thing that I noticed about this book is that the format is completely different from any other Cisco Press book I have read. This includes the diagrams and topologies, as well as the text formatting. I found that the new format made the book a little difficult to follow but that might just be due to my familiarity with the previous format. What I found the most useful was the configurations that were presented. They allowed me to see what the exact configurations looked like for specific QoS methods. This came in very handy when it came time to plan an implementation. This alone makes this book a must have for the reference library. The reader is going to need to make sure that they have a good grasp of networking basics in order to understand a lot of the concepts presented. The book does not spend that much time providing background on basic networking concepts. This title is designed to be a self-study certification guide for the Cisco 642-642 QoS exam. Each chapter of the book covers specific exam topics. In the beginning of each chapter there is a ¿Do I know this already¿ quiz. This enables the reader to gauge their existing knowledge to know whether or not they need to study the section. There are questions at the end of each chapter to access what the reader has learned and to reinforce key topics. A CD-ROM is included with the book. This CD-ROM contains both an electronic version of the book as well as a testing engine that can be used to prepare for the certification exam. The testing engine allows the user to take a timed exam and access what areas they are strong and weak in. This will allow users to validate their knowledge in the concepts and techniques that were presented in the book. The final chapter in the book covers Cisco¿s recommended best practices. I found this book the most informational because it illustrated the recommended way to tie all of the QoS technologies together. After all, most networks will have more than one type of QoS implemented. The one thing that I thought this book was missing was some type of practice labs. It is after all a ¿self study¿ book. The user could try to perform some of the examples that are presented in the book. It would have been nice to see some well put together labs that really drive home the configuration and functionality of each QoS method. Overall, I would have to say that this is a good book for those looking to learn more about QoS technologies. As long as you have a good networking foundation you will learn a lot from this book.

    1 out of 1 people found this review helpful.

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  • Posted December 27, 2011

    more from this reviewer

    QoS must read to certified and daily work around voice and video solutions

    I want to refresh my knowledge around the QoS and though that reading the new material for the Qos 642-642 Official Certification Guide will help me refresh all the knowledge gain when I got my CCVP certification. The Cisco certification guide is a very good material that has being evolving through the years and when I compare the initial official certification guides to the new ones a lot of effort and good material is compiled on this books.

    At my first quick review of the book where I read the index and browse some of the interesting topics that my eye catch. I found the material very easy to read because the material goes straight to the point and this is very simple when I was reviewing the complete material which includes the QoS fundamentals, components, modular QoS CLI and Auto QoS, classification and Making, Congestion Management, Congestion Avoidance, Traffic Policing and Shaping, link Efficiency Mechanisms and QoS Best Practices. The way the book is build allows you to understand how QoS works and implemented.

    This book also is a very good guide for the daily job, which will allow you to understand the concepts and the use it on a design, implementation and troubleshot scenarios.

    Easily I was able to remember concepts that I have not use for sometime but also found simple answers to specific topics that when I went through my certification exam were a little confusing and hard to understand.

    If you have some basic and practical knowledge around QoS this book will allow you to start linking the dots for your daily work and your certification exam and to improve your practical knowledge around Quality of Service.

    From the first page the book focus on real information needed for the certification exam and how to use in on your daily work for Quality of Services solutions.

    The book is very well organized since it is divided in 10 chapters which cover all the concepts of Quality of Service. Each chapter starts with an initial quiz which allows you to test your knowledge on topics of the chapter also there is a brief description of the topics the chapter covers.

    Another great feature of the book is the resume of the chapter that help you summarize the main point you need to remember from each chapter, it has specific information you will need for work, and certification exam.

    The authors of this book Wendell Odom and Michael J. Cavanaugh wrote a real world guide for the field and the certification exam.

    One more thing that I need to outline of the book is the real world example it uses to explain the different concepts of the Quality of Service.

    In addition the book also includes how Quality of Service is used for video, a very important theme that will start having relevance and now when you join voice and video the dots start to connect to the concepts.

    On every chapter the resume of each chapter help you to consolidate the knowledge of the chapter and have a reference of the most important topics on the chapter and for that specific topic to be use on the work and for the certification.

    It is a book that builds knowledge with the content you will see that the 10 chapters it contains cover the complete material for your certification exam and applies it to real world scenarios.

    I cannot stop reiterating that this book is a mandatory field guide for any person that is working on the IT industry delivering any project, service or anything that relates to it, even to your daily life.

    Was this review helpful? Yes  No   Report this review
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