A username is always accompanied by a password to grant some form of security. VPNs use the public Internet backbone and private data networks to replace costly leased line facilities. VPNs incorporate tunneling, encryption, encapsulation, packet authentication, user authentication, access control and quality of service to insure the secure and timely delivery of your data. Virus A virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. A virus might be attached to a document that is e-mailed or downloaded from the Internet.
Most viruses can replicate themselves.
All computer viruses are manmade. WAN Wide-Area Network. A network spanning hundreds or thousands of miles. Webpage A webpage is a document on the World Wide Web. This is the actual space that contains the web page.