Setting up a network is only the beginning. You might have a working network up and running. Every network, regardless of operating system used, connected through the Internet is vulnerable due to system weaknesses from known or obvious security holes. Security is essential to any environment. Whether you're at home or at work, security always seems to come up.
Nobody wants their computer broken into.
Here are some resources that will beef up your security. Medusa is a kernel patch that improves security by providing a seamless protective layer between system resources and applications, providing access control to system resources. Security Focus reported these vulnerabilities. Last week more developer resources were launched by different sources. These sites provide you with information or resources to help you as a developer.