The chapter presents information on the designs in a format that allows you to try your hand at the designs without yet seeing the way they are presented in the book. I'll note the point in each case study where you can set down the book and make some decisions yourself. Then you can pick the book up and compare your final design with what is presented here.

There are no right or wrong answers here; the point of this chapter is to give you some experience designing secure networks before you go and do it on your own. The sections of the chapter are organized as follows:

  • Organization overview
  • Current design
  • Security requirements
  • Design choices
  • Migration strategy
  • Attack example

Organization Overview

This section gives you a basic idea what the organization does and what the basic business requirements of the network are. Some information on IT staffing levels is also included.

Current Design

This section presents the network as it exists today. In some cases, the network meets the business requirements; in other cases, it does not. In all cases, security improvements must be made. Vulnerabilities in the current network are also highlighted.

Security Requirements

This section highlights the new security requirements as they specifically pertain to the network. These requirements are not complete and in most cases simply map business and policy requirements into specific technical requirements.

Design Choices

Here, the overall updated design that meets the business and security requirements for the organization is presented. This step can be completed on your own before looking at the design presented in this book.

Migration Strategy

Simply having a good security design is just part of the solution. To implement it on a production network, you need specific steps to take that allow the network to migrate to the new design in stages. This section highlights those stages at different levels of detail depending on the complexity of the design. Migrations strategies are discussed in more detail in Chapter 12, "Designing Your Security System."

Attack Example

The attack example section highlights a few key attacks and how the new security system responds to them. Attacks that are both successful and unsuccessful are highlighted.


There can be unique criteria for a design that are called out as appropriate within the individual sections.

Part I. Network Security Foundations

Network Security Axioms

Security Policy and Operations Life Cycle

Secure Networking Threats

Network Security Technologies

Part II. Designing Secure Networks

Device Hardening

General Design Considerations

Network Security Platform Options and Best Deployment Practices

Common Application Design Considerations

Identity Design Considerations

IPsec VPN Design Considerations

Supporting-Technology Design Considerations

Designing Your Security System

Part III. Secure Network Designs

Edge Security Design

Campus Security Design

Teleworker Security Design

Part IV. Network Management, Case Studies, and Conclusions

Secure Network Management and Network Security Management

Case Studies



Appendix A. Glossary of Terms

Appendix B. Answers to Applied Knowledge Questions

Appendix C. Sample Security Policies

INFOSEC Acceptable Use Policy

Password Policy

Guidelines on Antivirus Process


Network Security Architectures
Network Security Architectures
ISBN: 158705115X
EAN: 2147483647
Year: 2006
Pages: 249
Authors: Sean Convery © 2008-2020.
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