Are there any certifications or training regimens that deal specifically with security? How does one become a network security expert?
To check out the InformIT.com stuff, search on "Tittel security overview" -- they use dynamic URLs for database retrieval, so I can't give you a specific URL.
This should tell you most or everything of what you need to know. Read this stuff, then follow up with any additional questions you might have.
This was first published in June 2002