As you know, security is one of the primary concerns of everyone who relies on the Internet or on networked systems in general. How do you safeguard your network? It's vital for Internet professionals to know computer network security methods and be diligent in implementing and using them. This module discusses the need for security and various security threats to the client, the server, and the client-server connection. You will also learn the differences between a security policy and a security plan. Then, you will find out about security services such as access control and encryption. Rounding it out, you will learn the nature of various suspicious activities and how you can counteract them.
By the end of this module, you will be able to:

1. Explain the need for security
2. Identify the characteristics of a good security plan
3. Explain the basic methods used to keep connections to the Internet secure
4. Describe the differences between the security needs for the Internet, intranets, and extranets
5. Describe the various types of attacks that an Internet server is vulnerable to
6. Describe the various types of technologies to counteract server attacks

In the next lesson, you will learn about the need for network security.