Exam: 642-642

Vendor Cisco
Certification Cisco Specialist
Exam Code 642-642
Exam Title Quality of Service Exam
No. of Questions 87
Last Updated Jun 26, 2024
Product Type Q & A with Explanation
Question & Answers Download
Online Testing Engine Download
Desktop Testing Engine Download
Android Testing Engine Download

Demo Not Available
Request for demo please contact support@certkingdom.com



642-642 Exam PDF + Online Testing Engine + Offline Simulator + Android Testing Engine
Buy Now


  • 350-001

    CCIE Routing and Switching Written Exam

  • 350-018

    CCIE Pre-Qualification Test for Security

  • 350-023

    CCIE Written: WAN Switching

  • 350-029

    CCIE SP Written Exam

  • 350-040

    CCIE Storage Networking

  • 646-011

    Cisco Storage Sales Specialist

  • 646-058

    Cisco Lifecycle Services Advanced Routing and Switching

  • 350-030

    CCIE Voice Written

  • 642-061

    Routing and Switching Solutions for System Engineers (RSSSE)

  • 642-066

    Advanced Routing and Switching for Field Engineers

  • 642-071

    Cisco Unity Design and Networking

  • 642-072

    Cisco Unity Design and Networking

  • 642-081

    Business Ready Teleworker Solution Fundamentals

  • 646-096

    CRM Express for Account Managers

  • 646-151

    Cisco Sales Associate Exam

  • 646-171

    Cisco SMB Account Manager

  • 646-204

    Cisco Sales Expert

  • 646-228

    Cisco Lifecycle Services Advanced IP Communications

  • 646-393

    Cisco Lifecycle Services Express

  • 646-574

    Cisco Lifecycle Services Advanced Security (LCSAS)

  • 650-059

    Cisco Lifecycle Services Advanced Routing and Switching (LCSARS)

  • 650-251

    Cisco Lifecycle Services for Advanced Unified Communications (LCSAUC)

  • 650-393

    Cisco Lifecycle Services Express

  • 650-575

    Cisco Lifecycle Services Advanced Security

  • 650-621

    Cisco Lifecycle Services Advanced Wireless

  • 640-802

    Cisco Certified Network Associate (CCNA)

  • 642-104

    Unified Communication for System Engineers

  • 642-105

    Implementing Cisco Unified Messaging (UIM)

  • 642-143

    IP Telephony Express (IPTX)

  • 642-162

    IP Contact Center Express Implementation


Certkingdom's preparation material includes the most excellent features, prepared by the same dedicated experts who have come together to offer an integrated solution. We provide the most excellent and simple method to pass your certification exams on the first attempt "GUARANTEED"

Whether you want to improve your skills, expertise or career growth, with Certkingdom's training and certification resources help you achieve your goals. Our exams files feature hands-on tasks and real-world scenarios; in just a matter of days, you'll be more productive and embracing new technology standards. Our online resources and events enable you to focus on learning just what you want on your timeframe. You get access to every exams files and there continuously update our study materials; these exam updates are supplied free of charge to our valued customers. Get the best 642-642 exam Training; as you study from our exam-files "Best Materials Great Results"

642-642 Exam + Online / Offline and Android Testing Engine & 4500+ other exams included
$50 - $25
(you save $25)
Buy Now

642-642 QOS
 Quality of Service Exam
 Exam Description
The QOS exam is one of the qualifying exams for the Cisco Certified Internetwork Professional, Cisco Certified Voice Professional, Cisco IP Telephony Design Specialist, Cisco IP Telephony Express Specialist, Cisco IP Telephony Operations Specialist, and Cisco IP Telephony Support Specialist certifications. The QOS 642-642 exam will test materials covered under the Implementing Cisco Quality of Service QOS v2.1 course. The exam will certify that the successful candidate has knowledge and skills necessary to configure and troubleshoot Cisco IOS routers running Quality of Service protocols in Service Provider and Enterprise environments. The exam covers topics on IP QOS, classification and marking Mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, modular QOS command line interface, and QOS Best Practices.
 Exam Topics
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the 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
Make The Best Choice Chose - Certkingdom
Make yourself more valuable in today's competitive computer industry Certkingdom's preparation material includes the most excellent features, prepared by the same dedicated experts who have come together to offer an integrated solution. We provide the most excellent and simple method to pass your Cisco Cisco Specialist 642-642 exam on the first attempt "GUARANTEED".

Unlimited Access Package
will prepare you for your exam with guaranteed results, 642-642 Study Guide. Your exam will download as a single 642-642 PDF or complete 642-642 testing engine as well as over +4000 other technical exam PDF and exam engine downloads. Forget buying your prep materials separately at three time the price of our unlimited access plan - skip the 642-642 audio exams and select the one package that gives it all to you at your discretion: 642-642 Study Materials featuring the exam engine.

Certkingdom 642-642 Exam Prepration Tools
Certkingdom Cisco Cisco Specialist preparation begins and ends with your accomplishing this credential goal. Although you will take each Cisco Cisco Specialist online test one at a time - each one builds upon the previous. Remember that each Cisco Cisco Specialist exam paper is built from a common certification foundation.

642-642 Exam Testing Engines
Beyond knowing the answer, and actually understanding the 642-642 test questions puts you one step ahead of the test. Completely understanding a concept and reasoning behind how something works, makes your task second nature. Your 642-642 quiz will melt in your hands if you know the logic behind the concepts. Any legitimate Cisco Cisco Specialist prep materials should enforce this style of learning - but you will be hard pressed to find more than a Cisco Cisco Specialist practice test anywhere other than Certkingdom.

642-642 Exam Questions and Answers with Explanation
This is where your Cisco Cisco Specialist 642-642 exam prep really takes off, in the testing your knowledge and ability to quickly come up with answers in the 642-642 online tests. Using Cisco Specialist 642-642 practice exams is an excellent way to increase response time and queue certain answers to common issues.

642-642 Exam Study Guides
All Cisco Cisco Specialist online tests begin somewhere, and that is what the Cisco Cisco Specialist training course will do for you: create a foundation to build on. Study guides are essentially a detailed Cisco Cisco Specialist 642-642 tutorial and are great introductions to new Cisco Cisco Specialist training courses as you advance. The content is always relevant, and compound again to make you pass your 642-642 exams on the first attempt. You will frequently find these 642-642 PDF files downloadable and can then archive or print them for extra reading or studying on-the-go.

642-642 Exam Video Training
For some, this is the best way to get the latest Cisco Cisco Specialist 642-642 training. However you decide to learn 642-642 exam topics is up to you and your learning style. The Certkingdom Cisco Cisco Specialist products and tools are designed to work well with every learning style. Give us a try and sample our work. You'll be glad you did.

642-642 Other Features
* Realistic practice questions just like the ones found on certification exams.
* Each guide is composed from industry leading professionals real Cisco Cisco Specialistnotes, certifying 100% brain dump free.
* Study guides and exam papers are guaranteed to help you pass on your first attempt or your money back.
* Designed to help you complete your certificate using only
* Delivered in PDF format for easy reading and printing Certkingdom unique CBT 642-642 will have you dancing the Cisco Cisco Specialist jig before you know it
* Cisco Specialist 642-642 prep files are frequently updated to maintain accuracy. Your courses will always be up to date.

Get Cisco Specialist ebooks from Certkingdom which contain real 642-642 exam questions and answers. You WILL pass your Cisco Specialist exam on the first attempt using only Certkingdom's Cisco Specialist excellent preparation tools and tutorials.
This is what our customers are saying about CertKingdom.com.
These are real testimonials.
Hi friends! CertKingdom.com is No1 in sites coz in $50 I cant believe this but when I purchased the $50 package it was amazing I Cisco passed 10 Exams using CertKingdom guides in one Month So many thanks to CertKingdom Team , Please continue this offer for next year also. So many Thanks

Mike CA

Thank You! I would just like to thank CertKingdom.com for the Cisco Cisco Specialist 642-642 test guide that I bought a couple months ago and I took my test and pass overwhelmingly. I completed the test of 87 questions in about 90 minutes I must say that their Q & A with Explanation are very amazing and easy to learn.

Jay Brunets

After my co-workers found out what I used to pass Cisco Cisco Specialist 642-642 the test, that many are thinking about purchasing CertKingdom.com for their Cisco Specialist exams, I know I will again

John NA

I passed the Cisco Cisco Specialist 642-642 exam yesterday, and now it's on to security exam. Couldn't have done it with out you. Thanks very much.

Oley R.

Hello Everyone
I Just Passed The Cisco Cisco Specialist 642-642 Took 80 to 90 Minutes max to understand and easy to learn. Thanks For Everything Now On To 642-642

Robert R.

Hi CertKingdom.com thanks so much for your assistance in Cisco Cisco Specialist i passed today it was a breeze and i couldn't have done it without you. Thanks again

Seymour G.

I have used your Exam Study Guides for preparation for Cisco Cisco Specialist 642-642. I also passed all those on the first round. I'm currently preparing for the Microsoft and theCisco Specialist. exams

Ken T.

I just wanted to thank you for helping me get myCisco Specialist $50 package for all guides is awesome you made the journey a lot easier. I passed every test the first time using your Guide

Mario B.

I take this opportunity to express my appreciation to the authors of CertKingdom.com Cisco Cisco Specialist test guide. I purchased the 642-642 soon after my formal hands on training and honestly, my success in the test came out of nowhere but CertKingdom.com. Once again I say thanks

Kris H.

Dear CertKingdom.com team the test no. 642-642 that i took was very good, I received 880 and could have gain more just by learning your exams

Gil L.

Hi and Thanks I have just passed the Cisco Specialist Directory Services Design exam with a score of 928 thanks to you! The guide was excellent

Edward T.

Great stuff so far....I love this site....!! I am also on the Cisco Cisco Specialist I decided to start from certkingdom and start learning study Cisco Specialist from home... It has been really difficult but so far I have managed to get through 4 exams....., now currently studying for the more exams.... Have a good day.................................................. Cheers

Ted Hannam

Thanks for your Help, But I have finally downloaded Cisco Cisco Specialist 642-642 exam preparation from certkingdom.com they are provided me complete information about the exam, lets hope I get success for the 642-642 exam, I found there exams very very realistic and useful. thanks again

lindsay Paul

Certkingdom Offline Testing Engine Simulator Download

    Prepare with yourself how CertKingdom Offline Exam Simulator it is designed specifically for any exam preparation. It allows you to create, edit, and take practice tests in an environment very similar to an actual exam.

    Supported Platforms: Windows-7 64bit or later - EULA | How to Install?

    FAQ's: Windows-8 / Windows 10 if you face any issue kinldy uninstall and reinstall the Simulator again.

    Download Offline Simulator-Beta

Certkingdom Testing Engine Features

  • Certkingdom Testing Engine simulates the real exam environment.
  • Interactive Testing Engine Included
  • Live Web App Testing Engine
  • Offline Downloadable Desktop App Testing Engine
  • Testing Engine App for Android
  • Testing Engine App for iPhone
  • Testing Engine App for iPad
  • Working with the Certkingdom Testing Engine is just like taking the real tests, except we also give you the correct answers.
  • More importantly, we also give you detailed explanations to ensure you fully understand how and why the answers are correct.

Certkingdom Android Testing Engine Simulator Download

    Take your learning mobile android device with all the features as desktop offline testing engine. All android devices are supported.
    Supported Platforms: All Android OS EULA

    Install the Android Testing Engine from google play store and download the app.ck from certkingdom website android testing engine download

Certkingdom Android Testing Engine Features

  • CertKingdom Offline Android Testing Engine
  • Make sure to enable Root check in Playstore
  • Live Realistic practice tests
  • Live Virtual test environment
  • Live Practice test environment
  • Mark unanswered Q&A
  • Free Updates
  • Save your tests results
  • Re-examine the unanswered Q & A
  • Make your own test scenario (settings)
  • Just like the real tests: multiple choice questions
  • Updated regularly, always current