Chapter 1. Introduction: What Is ISA Server?

Objectives

This chapter does not fulfill a specific Microsoft-specified objective for the Installing, Configuring, and Administering Microsoft Internet Security and Acceleration (ISA) Server 2000 exam; however, it does lay a solid foundation on which to approach the objectives and other chapters in this book.

Outline

Introduction 11

Architecture Overview 12

ISA Server Clients 15

Web Proxy Clients 15

Firewall Clients 15

SecureNAT Clients 15

ISA Server Is a Multilayered Enterprise Firewall 16

Packet Filtering 17

Circuit-Level Filtering 17

Application-Level Filtering 17

Stateful Inspection 18

Built-In Intrusion Detection 18

System Hardening Templates 19

Virtual Private Networking 19

ISA Server Is a High-Performance Web Caching Server 19

Reverse Caching 20

Forward Caching 21

Scheduled Caching 22

Distributed Caching 23

Hierarchical Caching or Chaining 24

ISA Server Hosting Services 27

ISA Server Provides Integrated, Centralized Management and Control 28

Enterprise or Standard Editions 29

Firewall, Caching, or Integrated Modes 30

Policy-Based Rules 31

Bandwidth Rules 33

Protocol Rules 33

Site and Content Rules 33

Application Filters 33

How Rules and Filters Combine to Implement Policy 34

Tiered Policies: Both Enterprise and Array Level 35

Bandwidth Control 36

Logging and Reporting 37

Chapter Summary 38

Apply Your Knowledge 39

Review Questions 39

Exam Questions 39

Answers to Review Questions 40

Answers to Exam Questions 40