自顶向下网络设计（英文版）（第3版）
Contents
Introduction xxii
Part I Identifying Your Customer's Needs and Goals
Chapter 1 Analyzing Business Goals and Constraints
Using a Top-Down Network Design Methodology
Using a Structured Network Design Process
Systems Development Life Cycles
Plan Design Implement Operate Optimize （PDIOO） Network Life Cycle
Analyzing Business Goals
Working with Your Client
Changes in Enterprise Networks
Networks Must Make Business Sense
Networks Offer a Service
The Need to Support Mobile Users
The Importance of Network Security and Resiliency
Typical Network Design Business Goals
Identifying the Scope 网络设计f a Network Design Project
Identifying a Customer's Network Applications
Analyzing Business Constraints
Politics and Policies
Budgetary and Staffing Constraints
Project Scheduling
Business Goals Checklist
Summary
Review Questions
Design Scenario
Chapter 2 Analyzing Technical Goals and Tradeoffs
Scalability
Planning for Expansion
Expanding Access to Data
Constraints on Scalability
Availability
Disaster Recovery
Specifying Availability Requirements
Five Nines Availability
The Cost of Downtime
Mean Time Between Failure and Mean Time to Repair
Network Performance
Network Performance Definitions
Optimum Network Utilization
Throughput
Throughput of Internetworking Devices
Application Layer Throughput
Accuracy
Efficiency
Delay and Delay Variation
Causes of Delay
Delay Variation
Response Time
Security
Identifying Network Assets
Analyzing Security Risks
Reconnaissance Attacks
Denial-of-Service Attacks
Developing Security Requirements
Manageability
Usability
Adaptability
Affordability
Making Network Design Tradeoffs
Technical Goals Checklist
Summary
Review Questions
Design Scenario
Chapter 3 Characterizing the Existing Internetwork
Characterizing the Network Infrastructure
Developing a Network Map
Characterizing Large Internetworks
Characterizing the Logical Architecture
Developing a Modular Block Diagram
Characterizing Network Addressing and Naming
Characterizing Wiring and Media
Checking Architectural and Environmental Constraints
Checking a Site for a Wireless Installation
Performing a Wireless Site Survey
Checking the Health of the Existing Internetwork
Developing a Baseline of Network Performance
Analyzing Network Availability
Analyzing Network Utilization
Measuring Bandwidth Utilization by Protocol
Analyzing Network Accuracy
Analyzing Errors on Switched Ethernet Networks
Analyzing Network Efficiency
Analyzing Delay and Response Time
Checking the Status of Major Routers， Switches， and Firewalls
Network Health Checklist
Summary
Review Questions
Hands-On Project
Design Scenario
Chapter 4 Characterizing Network Traffic
Characterizing Traffic Flow
Identifying Major Traffic Sources and Stores
Documenting Traffic Flow on the Existing Network
Characterizing Types of Traffic Flow for New Network Applications
Terminal/Host Traffic Flow
Client/Server Traffic Flow
Peer-to-Peer Traffic Flow
Server/Server Traffic Flow
Distributed Computing Traffic Flow
Traffic Flow in Voice over IP Networks
Documenting Traffic Flow for New and Existing Network Applications
Characterizing Traffic Load
Calculating Theoretical Traffic Load
Documenting Application-Usage Patterns
Refining Estimates of Traffic Load Caused by Applications
Estimating Traffic Load Caused by Routing Protocols
Characterizing Traffic Behavior
Broadcast/Multicast Behavior
Network Efficiency
Frame Size
Windowing and Flow Control
Error-Recovery Mechanisms
Characterizing Quality of Service Requirements
ATM QoS Specifications
Constant Bit Rate Service Category
Real-time Variable Bit Rate Service Category
Non-real-time Variable Bit Rate Service Category
Unspecified Bit Rate Service Category
Available Bit Rate Service Category
Guaranteed Frame Rate Service Category
IETF Integrated Services Working Group QoS Specifications
Controlled-Load Service
Guaranteed Service
IETF Differentiated Services Working Group QoS Specifications
Grade of Service Requirements for Voice Applications
Documenting QoS Requirements
Network Traffic Checklist
Summary
Review Questions
Design Scenario
Summary for Part I
Part II Logical Network Design
Chapter 5 Designing a Network Topology
Hierarchical Network Design
Why Use a Hierarchical Network Design Model？
Flat Versus Hierarchical Topologies
Flat WAN Topologies
Flat LAN Topologies
Mesh Versus Hierarchical-Mesh Topologies
Classic Three-Layer Hierarchical Model
Core Layer
Distribution Layer
Access Layer
Guidelines for Hierarchical Network Design
Redundant Network Design Topologies
Backup Paths
Load Sharing
Modular Network Design
Cisco SAFE Security Reference Architecture
Designing a Campus Network Design Topology
Spanning Tree Protocol
Spanning Tree Cost Values
Rapid Spanning Tree Protocol
RSTP Convergence and Reconvergence
Selecting the Root Bridge
Scaling the Spanning Tree Protocol
Virtual LANs
Fundamental VLAN Designs
Wireless LANs
Positioning an Access Point for Maximum Coverage
WLANs and VLANs
Redundant Wireless Access Points
Redundancy and Load Sharing in Wired LANs
Server Redundancy
Workstation-to-Router Redundancy
Hot Standby Router Protocol
Gateway Load Balancing Protocol
Designing the Enterprise Edge Topology
Redundant WAN Segments
Circuit Diversity
Multihoming the Internet Connection
Virtual Private Networking
Site-to-Site VPNs
Remote-Access VPNs
Service Provider Edge
Secure Network Design Topologies
Planning for Physical Security
Meeting Security Goals with Firewall Topologies
Summary
Review Questions
Design Scenario
……
Part III Physical Network Design
Part IV Testing， Optimizing， and Documenting Your Network Design
Introduction xxii
Part I Identifying Your Customer's Needs and Goals
Chapter 1 Analyzing Business Goals and Constraints
Using a Top-Down Network Design Methodology
Using a Structured Network Design Process
Systems Development Life Cycles
Plan Design Implement Operate Optimize （PDIOO） Network Life Cycle
Analyzing Business Goals
Working with Your Client
Changes in Enterprise Networks
Networks Must Make Business Sense
Networks Offer a Service
The Need to Support Mobile Users
The Importance of Network Security and Resiliency
Typical Network Design Business Goals
Identifying the Scope 网络设计f a Network Design Project
Identifying a Customer's Network Applications
Analyzing Business Constraints
Politics and Policies
Budgetary and Staffing Constraints
Project Scheduling
Business Goals Checklist
Summary
Review Questions
Design Scenario
Chapter 2 Analyzing Technical Goals and Tradeoffs
Scalability
Planning for Expansion
Expanding Access to Data
Constraints on Scalability
Availability
Disaster Recovery
Specifying Availability Requirements
Five Nines Availability
The Cost of Downtime
Mean Time Between Failure and Mean Time to Repair
Network Performance
Network Performance Definitions
Optimum Network Utilization
Throughput
Throughput of Internetworking Devices
Application Layer Throughput
Accuracy
Efficiency
Delay and Delay Variation
Causes of Delay
Delay Variation
Response Time
Security
Identifying Network Assets
Analyzing Security Risks
Reconnaissance Attacks
Denial-of-Service Attacks
Developing Security Requirements
Manageability
Usability
Adaptability
Affordability
Making Network Design Tradeoffs
Technical Goals Checklist
Summary
Review Questions
Design Scenario
Chapter 3 Characterizing the Existing Internetwork
Characterizing the Network Infrastructure
Developing a Network Map
Characterizing Large Internetworks
Characterizing the Logical Architecture
Developing a Modular Block Diagram
Characterizing Network Addressing and Naming
Characterizing Wiring and Media
Checking Architectural and Environmental Constraints
Checking a Site for a Wireless Installation
Performing a Wireless Site Survey
Checking the Health of the Existing Internetwork
Developing a Baseline of Network Performance
Analyzing Network Availability
Analyzing Network Utilization
Measuring Bandwidth Utilization by Protocol
Analyzing Network Accuracy
Analyzing Errors on Switched Ethernet Networks
Analyzing Network Efficiency
Analyzing Delay and Response Time
Checking the Status of Major Routers， Switches， and Firewalls
Network Health Checklist
Summary
Review Questions
Hands-On Project
Design Scenario
Chapter 4 Characterizing Network Traffic
Characterizing Traffic Flow
Identifying Major Traffic Sources and Stores
Documenting Traffic Flow on the Existing Network
Characterizing Types of Traffic Flow for New Network Applications
Terminal/Host Traffic Flow
Client/Server Traffic Flow
Peer-to-Peer Traffic Flow
Server/Server Traffic Flow
Distributed Computing Traffic Flow
Traffic Flow in Voice over IP Networks
Documenting Traffic Flow for New and Existing Network Applications
Characterizing Traffic Load
Calculating Theoretical Traffic Load
Documenting Application-Usage Patterns
Refining Estimates of Traffic Load Caused by Applications
Estimating Traffic Load Caused by Routing Protocols
Characterizing Traffic Behavior
Broadcast/Multicast Behavior
Network Efficiency
Frame Size
Windowing and Flow Control
Error-Recovery Mechanisms
Characterizing Quality of Service Requirements
ATM QoS Specifications
Constant Bit Rate Service Category
Real-time Variable Bit Rate Service Category
Non-real-time Variable Bit Rate Service Category
Unspecified Bit Rate Service Category
Available Bit Rate Service Category
Guaranteed Frame Rate Service Category
IETF Integrated Services Working Group QoS Specifications
Controlled-Load Service
Guaranteed Service
IETF Differentiated Services Working Group QoS Specifications
Grade of Service Requirements for Voice Applications
Documenting QoS Requirements
Network Traffic Checklist
Summary
Review Questions
Design Scenario
Summary for Part I
Part II Logical Network Design
Chapter 5 Designing a Network Topology
Hierarchical Network Design
Why Use a Hierarchical Network Design Model？
Flat Versus Hierarchical Topologies
Flat WAN Topologies
Flat LAN Topologies
Mesh Versus Hierarchical-Mesh Topologies
Classic Three-Layer Hierarchical Model
Core Layer
Distribution Layer
Access Layer
Guidelines for Hierarchical Network Design
Redundant Network Design Topologies
Backup Paths
Load Sharing
Modular Network Design
Cisco SAFE Security Reference Architecture
Designing a Campus Network Design Topology
Spanning Tree Protocol
Spanning Tree Cost Values
Rapid Spanning Tree Protocol
RSTP Convergence and Reconvergence
Selecting the Root Bridge
Scaling the Spanning Tree Protocol
Virtual LANs
Fundamental VLAN Designs
Wireless LANs
Positioning an Access Point for Maximum Coverage
WLANs and VLANs
Redundant Wireless Access Points
Redundancy and Load Sharing in Wired LANs
Server Redundancy
Workstation-to-Router Redundancy
Hot Standby Router Protocol
Gateway Load Balancing Protocol
Designing the Enterprise Edge Topology
Redundant WAN Segments
Circuit Diversity
Multihoming the Internet Connection
Virtual Private Networking
Site-to-Site VPNs
Remote-Access VPNs
Service Provider Edge
Secure Network Design Topologies
Planning for Physical Security
Meeting Security Goals with Firewall Topologies
Summary
Review Questions
Design Scenario
……
Part III Physical Network Design
Part IV Testing， Optimizing， and Documenting Your Network Design
《自顶向下网络设计（英文版）（第3版）》是围绕自顶向下网络设计步骤编写的，提供给网络设计者一种系统的结构化网络设计方法。《自顶向下网络设计（英文版）（第3版）》分为4个部分，即客户需求和目标、逻辑网络设计、物理网络设计，以及网络测试、优化和文档编写。4个部分分别对应着网络 设计的各个重要阶段，每个阶段都提供给读者详细的设计指导原则，内容涵盖网络设计的方方面面。《自顶向下网络设计（英文版）（第3版）》从用户商业和技术目标的分析入手，从而制定出相应的网络流量、负载和QoS需求，进而开发网络的逻辑拓扑结构，然后进入地址规划、协议选择、网络安全和网络管理实施策略制定，最后是对网络设备的选型建议以及网络实施、测试和文档编写。《自顶向下网络设计（英文版）（第3版）》每章以复习题和设计环境作为一章的总结和回顾，理论与实践相结合，从而让读者更好地理解和掌握自顶向下网络设计的思想。
《自顶向下网络设计（英文版）（第3版）》适合Cisco代理商、网络运营商、其他网络设备商的网络部署人员、售后技术支持人员阅读；网络维护人员，以及网络技术爱好者也可以从《自顶向下网络设计（英文版）（第3版）》中获益。
《自顶向下网络设计（英文版）（第3版）》适合Cisco代理商、网络运营商、其他网络设备商的网络部署人员、售后技术支持人员阅读；网络维护人员，以及网络技术爱好者也可以从《自顶向下网络设计（英文版）（第3版）》中获益。
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