Ccnp Ont Official Exam Certification Guide

, by Ranjbar, Amir

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ISBN: 9781587201769 | 1587201763
Cover: Hardcover w/CD
Copyright: 1/1/2007

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Summary

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Prepare for the all-new CCNP ONT 642-845 exam with the only official self-study guide from Cisco Press.

Voice over IP	p. 3
Cisco VoIP Implementations	p. 5
"Do I Know This Already?" Quiz	p. 5
Foundation Topics	p. 10
Introduction to VoIP Networks	p. 10
Benefits of Packet Telephony Networks	p. 10
Packet Telephony Components	p. 11
Analog Interfaces	p. 13
Digital Interfaces	p. 14
Stages of a Phone Call	p. 15
Distributed Versus Centralized Call Control	p. 16
Digitizing and Packetizing Voice	p. 19
Basic Voice Encoding: Converting Analog to Digital	p. 19
Basic Voice Encoding: Converting Digital to Analog	p. 20
The Nyquist Theorem	p. 21
Quantization	p. 22
Compression Bandwidth Requirements and Their Comparative Qualities	p. 24
Digital Signal Processors	p. 25
Encapsulating Voice Packets	p. 27
End-to-End Delivery of Voice	p. 27
Protocols Used in Voice Encapsulation	p. 30
Reducing Header Overhead	p. 32
Bandwidth Calculation	p. 34
Impact of Voice Samples and Packet Size on Bandwidth	p. 34
Data Link Overhead	p. 37
Security and Tunneling Overhead	p. 37
Calculating the Total Bandwidth for a VoIP Call	p. 39
Effects of VAD on Bandwidth	p. 41
Implementing VoIP Support in an Enterprise Network	p. 42
Enterprise Voice Implementations	p. 42
Voice Gateway Functions on a Cisco Router	p. 44
Cisco Unified CallManager Functions	p. 45
Enterprise IP Telephony Deployment Models	p. 46
Single-Site Model	p. 46
Multisite with Centralized Call Processing Model	p. 46
Multisite with Distributed Call Processing Model	p. 47
Clustering over WAN Model	p. 48
Identifying Voice Commands in IOS Configurations	p. 48
Call Admission Control (CAC)	p. 49
Quality of Service	p. 55
IP Quality of Service	p. 57
"Do I Know This Already?" Quiz	p. 57
Foundation Topics	p. 62
Introduction to QoS	p. 62
Converged Network Issues Related to QoS	p. 62
Available Bandwidth	p. 63
End-to-End Delay	p. 64
Delay Variation	p. 65
Packet Loss	p. 66
Definition of QoS and the Three Steps to Implementing It	p. 68
Implementing QoS	p. 69
Identifying and Comparing QoS Models	p. 72
Best-Effort Model	p. 72
Integrated Services Model	p. 73
Differentiated Services Model	p. 74
QoS Implementation Methods	p. 76
Legacy Command-Line Interface (CLI)	p. 76
Modular QoS Command-Line Interface (MQC)	p. 76
AutoQoS	p. 79
Router and Security Device Manager (SDM) QoS Wizard	p. 81
Foundation Summary	p. 89
Q&A	p. 91
Classification, Marking, and NBAR	p. 93
"Do I Know This Already?" Quiz	p. 93
Foundation Topics	p. 97
Classification and Marking	p. 97
Layer 2 QoS: CoS on 802.1	p. 98
Layer 2 QoS: DE and CLP on Frame Relay and ATM (Cells)	p. 99
Layer 2 1/2 QoS: MPLS EXP Field	p. 100
The DiffServ Model, Differentiated Services Code Point (DSCP), and Per-Hop Behavior(PHB)	p. 100
IP Precedence and DSCP	p. 102
QoS Service Class	p. 106
Trust Boundaries	p. 108
Network Based Application Recognition (NBAR)	p. 110
Cisco IOS Commands to Configure NBAR	p. 112
Foundation Summary	p. 118
Q&A	p. 119
Congestion Management and Queuing	p. 123
"Do I Know This Already?" Quiz	p. 123
Foundation Topics	p. 127
Introduction to Congestion Management and Queuing	p. 127
First-In-First-Out, Priority Queuing, Round-Robin, and Weighted Round-Robin Queuing	p. 130
Weighted Fair Queuing	p. 132
WFQ Classification and Scheduling	p. 133
WFQ Insertion and Drop Policy	p. 135
Benefits and Drawbacks of WFQ	p. 135
Configuring and Monitoring WFQ	p. 135
Class-Based Weighted Fair Queuing	p. 138
Classification, Scheduling, and Bandwidth Guarantee	p. 139
Benefits and Drawbacks of CBWFQ	p. 140
Configuring and Monitoring CBWFQ	p. 141
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Ccnp Ont Official Exam Certification Guide

Summary

Table of Contents

Supplemental Materials