Network Sales and Services Handbook

Chapter 15. Network Security Basics

The following topics are covered in this chapter:

• Network Threats

• Network Attack Methods

• Proxy Servers and DMZ

• Firewalls

• Intrusion Detection Monitoring

• Network Security Architecture

The goal of network security is to provide users with access to the resources they need on a network or system, while preventing access to resources they don't need, which protects the system against known and unknown threats. This chapter looks at network security threats and shows how to protect against them.

Network Threats

In order to design an effective security solution, it is important to understand the types of network threats that exist. These threats to a network or system are categorized as follows:

• Denial-of-Service (DoS)

• Unauthorized ...