642-642

642-642 QOS
Quality of Service Exam

Exam Number: 642-642
Associated Certifications: CCIP, CCVP, IP Telephony Design Specialist, IP Telephony Express Specialist, IP Telephony Operations Specialist, and IP Telephony Support Specialist
Duration: 90 minutes (45-55 questions)
Available Languages: English
Click Here to Register: Pearson VUE
Exam Policies: Read current policies and requirements
Exam Tutorial: Review type of exam questions

Exam Description Exam Topics Recommended Training Additional Resources
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

Donwload Free PassGuide Braindumps-The Most Realistic Practice Questions and Answers,Help You Pass any Exams

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

The 642-642 certificates give you possibility to work in any country of the world because they are acknowledged in all countries equally. This 642-642 torrent certificate helps
not only to improve your knowledge and skills, but it also helps your career, gives a possibility for qualified usage of 642-642 exam products under different conditions. The
majority of companies in the sphere of information technologies require the presence of 642-642 exams for the work in the company, and that makes obtaining this 132-S-708.1
certificate necessary. Many IT specialists were not able to obtain the real 642-642 certificate from the first attempt, which was the result of poor preparation for the
examination, using preparatory 642-642 study guide of poor quality.

The PassGuide leader among the providers of 642-642 preparatory materials is products such as 642-642 vce pdf Braindumps, 642-642 Tutorial, 642-642 Exam Questions with Answers, 642-642
Trainings, 642-642 Test Online Simulations Course and free PDF. It obtained its leadership and trust of the users from the very beginning of its work on the 642-642 training
materials market. All the 642-642 value pack aids have been created by people who are personally familiar with actualtests 642-642 Preparation Labs and who know all the
difficulties and popular mistakes made by those who take a 642-642 . The entire material is logically composed in such a way that everything becomes easy to understand for
anyone. full download Many 642-642 guides include audio and video material. It is really easy to acquire 642-642 exams because of great variety of methods of payment.

pass4sure testking 642-642 transcender PassGuide Testinside rapidshare 4shared links

High quality IT Certification Training Exam Questions, Study Guides and Practice Tests are in Downloadable PassGuide Testing Engine,Successful for IT Certification or Full Refund for you.Contact Us:Sales@PassGuide.com

Type	Exam Bible	New Questions & Answers	Latest Updated	Download link
PDF	All Certbible 's Exam Dumps	597	1 days ago	Available

PassGuide Training Materials & Practice Tests

• CBT NUGGETS Videos In Development
• testking cisco demo
• testinside CCIP CCVP IP Communications CISCO 642-642 Exam
• [offer] Actualtests, Latest Versions, CCNA-CCNP-CCIP-CCVP-CCSP-CCIE and MORE!!!
• free testking actualtest cisco 642-642 exam vce
• free latest pass4sure dumps
• All Pass4sure/topcerts For Cisco
• free PASS4SURE ALL IN ONE
• free Pass4sure demo download
• Latest Update:PassGuide Cisco Certification Brainudmps