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www CareerCert info,Mega Guide Cisco CCVP Quality of Service 642 642 . www preplogic com n, 1 800 418 6789, Cisco CCVP Quality of Service. Copyright 2008 by PrepLogic Inc , Product ID 011480. Production Date December 19 2008, All rights reserved No part of this document shall be stored in a retrieval system or transmitted by any. means electronic mechanical photocopying recording or otherwise without written permission from. the publisher No patent liability is assumed with respect to the use of the information contained herein . Warning and Disclaimer, Every effort has been made to make this document as complete and as accurate as possible but no war .
ranty or fitness is implied The publisher and authors assume no responsibility for errors or omissions The. information provided is on an as is basis The authors and the publisher shall have neither liability nor. responsibility to any person or entity with respect to any loss or damages arising from the information. contained in this document , Volume Corporate and Educational Sales. PrepLogic offers favorable discounts on all products when ordered in quantity For more information . please contact PrepLogic directly , 1 800 418 6789. solutions preplogic com,PrepLogic Practice Exams n. Video Training n, Mega Guides n, Printables n, Audio Training. www CareerCert info,Mega Guide Cisco CCVP Quality of Service 642 642 .
www preplogic com n, 1 800 418 6789, Abstract 8, Your Product 8. About the Author 8, Domain 1 IP QoS Fundamentals 9. QoS Basics 9, The Need for QoS 9, Traffic Characteristics 12. Bandwidth 12, Delay 12, Jitter 14, Loss 14, QoS Implementation 15. QoS Implementation Methods 15, Domain 2 IP QoS Components 20.
QoS Models 20, Best Effort 20, Integrated Services 20. Differentiated Services 20, DiffServ Functionality 21. Classification and Marking 21, Congestion Management and Avoidance 26. Link Efficiency 27, Traffic Policing and Shaping 27. Per Hop Behaviors PHB 27, Trust Boundaries 29, Domain 3 Modular QoS CLI MQC and Auto QoS 29.
MQC CLI Basics 29, MQC Examples 29, Voice Only 29. Voice Using Access List and class default 31, Matching Opposites 32. Matching multiple criteria 33, AutoQoS Basics 34, AutoQoS Implementation 34. PrepLogic Practice Exams n, Video Training n, Mega Guides n. Printables n, Audio Training, www CareerCert info.
Mega Guide Cisco CCVP Quality of Service 642 642 , www preplogic com n. 1 800 418 6789, AutoQoS VoIP and AutoQoS Enterprise Differences 36. Configuration 37, policy map 37, class map 37, class 37. service policy input 37, service policy output 37. match protocol 38, match fr dlci 38, match access group 38.
match cos 38, match precedence 38, match dscp 39, match input interface 39. match ip rtp 39, match mpls experimental 39, match mpls experimental topmost 39. match packet length 40, set atm clp 40, set cos 40. set precedence 40, set dscp 40, set fr de 41, set ip tos 41. set mpls experimental imposition 41, set mpls experimental topmost 41.
bandwidth CBWFQ 41, random detect 42, random detect dscp 42. random detect precedence 43, random detect exponential weighting constant 43. compression header ip 43, auto discovery qos 44, auto qos 44. PrepLogic Practice Exams n, Video Training n, Mega Guides n. Printables n, Audio Training, www CareerCert info.
Mega Guide Cisco CCVP Quality of Service 642 642 , www preplogic com n. 1 800 418 6789, auto qos voip 44, auto qos voip cisco phone 44. Troubleshooting 45, show class map 45, show policy map 45. show ip tcp header compression 46, show ip rtp header compression 46. show auto discovery qos 47, show auto qos 48, show policy map interface 48.
Domain 4 Classification and Marking 49, Classification and Marking Basics 49. Classification and Marking Configuration 50, Network Based Application Recognition NBAR 50. NBAR Configuration 51, Basic Classification and Marking Configuration 52. Pre Classify 56, Trust Boundaries 56, Configuration 56. ip nbar protocol discovery 56, ip nbar pdlm 56, ip nbar custom 57.
qos pre classify 57, Domain 5 Congestion Management Methods 58. Congestion Management Mechanisms 58, First In First Out FIFO Queuing 58. Priority Queuing PQ 59, Weighted Round Robin WRR and Custom Queuing CQ 60. Weighted Fair Queuing WFQ 61, Class Based Weighted Fair Queuing CBWFQ 63. Low Latency Queuing LLQ 64, Control Plane Policing CoPP 65.
Software and Hardware Queuing 65, Congestion Management Configuration 65. PrepLogic Practice Exams n, Video Training n, Mega Guides n. Printables n, Audio Training, www CareerCert info. Mega Guide Cisco CCVP Quality of Service 642 642 , www preplogic com n. 1 800 418 6789, fair queue 65, hold queue 66, bandwidth CBWFQ 66.
max reserved bandwidth 66, priority 66, queue list queue limit 67. queue list queue byte count 67, queue list protocol 67. queue list interface 68, queue list default 68, Domain 6 Congestion Avoidance Methods 68. Tail Drop 68, Weighted Random Early Detection WRED 68. WRED and Queuing 70, Explicit Congestion Notification ECN and WRED 73.
Configuration Avoidance Configuration 74, random detect 74. random detect dscp 74, random detect precedence 75. random detect ecn 75, random detect exponential weighting constant 75. Domain 7 Traffic Policing and Shaping 76, Token Bucket Concept 76. Traffic Policing Basics 76, Traffic Policing Configuration 77.
Basics 77, police 78, Traffic Shaping 81, Basics 81. Shaping Adaptation 82, Traffic Shaping Configuration 82. shape 83, shape percent 83, shape fecn adapt 83,PrepLogic Practice Exams n. Video Training n, Mega Guides n, Printables n, Audio Training. www CareerCert info,Mega Guide Cisco CCVP Quality of Service 642 642 .
www preplogic com n, 1 800 418 6789, shape fr voice adapt 83. Troubleshooting 84, Domain 8 Link Efficiency Mechanisms 84. Link and Fragmentation and Interleaving LFI 84, Multilink PPP MLP 84. Frame Relay LFI FRF 12 85, LFI Configuration 85, Compression 87. Header Compression 87, Payload Compression 87, Compression Configuration 88.
Configuration 88, ppp multilink 88, ppp multilink fragment delay 88. ppp multilink interleave 89, ppp multilink group 89. frame relay traffic shaping 89, frame relay class 89. frame relay fragment 89, frame relay traffic rate 90. frame relay adaptive shaping 90, Domain 9 QoS Best Practices 90.
QoS Application Type Requirements 90, Voice 90, Video 91. Data 91, Campus QoS Recommendations 92, Customer Edge CE to Providers Edge PE QoS Recommendations 92. PrepLogic Practice Exams n, Video Training n, Mega Guides n. Printables n, Audio Training, www CareerCert info. Mega Guide Cisco CCVP Quality of Service 642 642 , www preplogic com n.
1 800 418 6789, The Cisco Certified Voice Professional is one of the most well respected certifications in the world By. attaining it students and candidates signify themselves as extremely accomplished and capable Network . ing and Voice over IP Professionals The fives exams required to become a CCVP are extremely difficult. and not to be taken lightly They cover a myriad of topics in particular the QoS Quality of Service exam. covers the process of managing the quality of network flow cQoSrol and packet consolidation The QoS is. multiple choice simulative and incorporates test strategies such as drag and drop and hot area ques . tions to verify a candidate s knowledge , Before taking this exam you should be very familiar with both Cisco technology and networking You. must have also attained the Cisco CCNA certification by passing either the one or two part path . Your Product, This QoS Mega Guide has been designed from the ground up with you the student in mind It is lean . strong and specifically targeted toward the candidate Unlike many other QOS products the PrepLogic. QOS Mega Guide does not waste time with excessive explanations Instead it is packed full of valuable. techniques priceless information and brief but precisely worded explanations While we do not recom . mend using only this product to pass the exam but rather a combination of PrepLogic Audio Training . Practice Exams and Video Training we have designed the product so that it and it alone can be used to. pass the exam , About the Author, Sean Wilkins is an accomplished networking consultant and has been in the field of IT since the mid 1990 s. working with companies like Cisco Lucent Verizon and AT T In addition to being a CCNP and CCDP Sean. is also a MCSE and an overall IT expert In addition to working as a consultant Sean spends a lot of his. time as a technical writer and editor ,PrepLogic Practice Exams n.
Video Training n, Mega Guides n, Printables n, Audio Training. www CareerCert info,Mega Guide Cisco CCVP Quality of Service 642 642 . www preplogic com n, 1 800 418 6789, Domain 1 IP QoS Fundamentals. QoS Basics, The important thing about Quality of Service QoS is its purpose Networks these days are getting bigger. and bigger and a larger amount of companies are using the Internet in some way to transport their traffic . Many companies have grown to the point where the differentiation of traffic over their networks is vital. in order for certain traffic to get where it is going in a timely manner Within QoS there are a number of. mechanism types which are used to remedy these problems Within networks there are two main ways to. mark traffic Marking the priority of the traffic is important because it provides some information which. is part of the traffic itself which enables the networking equipment to look for the traffic and allows the. networking equipment to perform prioritizing actions on the important traffic The second way is a way of. notating congestion in a network This type of marking is mainly used for congestion avoidance because. the routers are given some indication of when congestion starts and from this information have the op . tion to use preempt congestion by dropping packets based on a congestion threshold . The routers themselves can be configured to make QoS decisions based on the information in the traffic. but there is typically no end to end QoS mechanism Cisco routers use a number of different mechanisms. to provide QoS These mechanisms include congestion management solutions queuing mechanisms . congestion avoidance mechanisms and traffic control mechanisms . Bottom line is that QoS is the grouping of technologies which provides a way to specify different qual . ity parameters to different types of traffic QoS is needed in today s networks because more and more. networks are becoming data and voice converged networks meaning that data voice and video flow over. the same network This of course makes data voice and video traffic influential over each other Some traf . fic like file transfers or web pages is not as reliant on specific timing as VoIP or Video over IP If a packet of. a file arrives 30 seconds late the transfer is just slowed down a little If a voice or video packet arrives late it. becomes useless in the audio or video stream , The Need for QoS.
In order to deal with QoS issues there have been a number of different types of mechanisms created to. help implement QoS These different mechanisms work in different ways in order to be used in conjunc . tion with each other so end to end QoS is under the requirements needed for the application . Video and Voice, With a voice call one way delay budgets have been established by standards These budgets set a total. amount of delay which is considered acceptable for different levels of voice service These are shown. in Table 1 , 1 way Delay in ms Description, 0 150 ITU G 114 Acceptable Range. 0 200 Cisco Acceptable Range, 150 400 ITU G 114 Degraded Range. 400 ITU G 114 Unacceptable Range, Table 1 Delay Budget. PrepLogic Practice Exams n, Video Training n, Mega Guides n.
Printables n, Audio Training, www CareerCert info. Mega Guide Cisco CCVP Quality of Service 642 642 , www preplogic com n. 1 800 418 6789, On top of the requirements for delay a minimal amount of sustained bandwidth is needed in order for a. voice or video call to go through and be of good quality The amount of bandwidth needed and the qual . ity needed depend on the codec selection The following are the main voice codecs which are used today . Voice Codec Acronym Name Bit Rate, G 711 PCM Pulse Code Modulation 64 kbps. G 722 SB ADPCM Sub Band ADPCM 48 56 64 kbps, G 722 1 MLT Modulated Lapped 24 and 32 kbps.
G 722 2 ACELP Algebraic Code Excited 6 60 8 85 12 65 14 25 . Linear Prediction Coder 15 85 18 25 19 85 , 23 05 or 23 85 kbps. G 723 1 ACELP Algebraic Code Excited 5 3 kbps, 5 3 kbps Linear Prediction Coder. G 723 1 MP MLQ Multi Pulse Maximum 6 3 kbps, 6 3 kbps Likelihood Quantization. This QoS Mega Guide has been designed from the ground up with you the student in mind It is lean strong and specifically targeted toward the candidate Unlike many other QOS products the PrepLogic QOS Mega Guide does not waste time with excessive explanations Instead it is packed full of valuable

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