The NIHnet Extranet Site-To-Site VPN Service serves as a vehicle for NIH personnel, mainframes, and servers to exchange information and data securely with NIH business partners, associates, and other external entities. The NIH Extranet DMZ also provides hosting services to other agencies and business partners. Hosted servers or applications would be located logically just outside of the NIH perimeter but still be protected from the Internet by the Extranet DMZ firewalls.