Home > Store

Cisco QOS Exam Certification Guide (IP Telephony Self-Study), 2nd Edition

Register your product to gain access to bonus material or receive a coupon.

Cisco QOS Exam Certification Guide (IP Telephony Self-Study), 2nd Edition

eBook (Watermarked)

  • Your Price: $55.19
  • List Price: $68.99
  • About Watermarked eBooks
  • This PDF will be accessible from your Account page after purchase and requires PDF reading software, such as Acrobat® Reader®.

    The eBook requires no passwords or activation to read. We customize your eBook by discreetly watermarking it with your name, making it uniquely yours.

    Watermarked eBook FAQ


  • Copyright 2005
  • Dimensions: 7-3/8" x 9-1/8"
  • Pages: 768
  • Edition: 2nd
  • eBook (Watermarked)
  • ISBN-10: 1-58720-277-8
  • ISBN-13: 978-1-58720-277-3

This is the eBook version of the print title. The eBook edition does not provide access to the CD content that accompanies the print book.

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 www.cisco.com/go/authorizedtraining.


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.

Sample Content

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.




Submit Errata

More Information

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020