As the world increasingly depends on computers to do business, the need for safeguarding computer resources also increases. Unfortunately, some individuals endeavor to attack computer networks, steal information, and spread malicious viruses. These attackers often seek to compromise, damage, or destroy valuable information resources. It should be little surprise that these attackers will break into unprotected or poorly protected computer systems and networks. This paper describes how RSA Security's two-factor authentication can be used with Interlink Networks RAD-Series AAA Servers to fortify network access security.