CertiGuide to Network+  9  Glossary

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Virtual memory

The space on the hard disk that Windows 2000 uses as memory. Because of virtual memory, the amount of memory taken from the perspective of a process can be much greater than the actual physical memory in the computer. The operating system does this in a way that is transparent to the application, by paging data that does not fit in physical memory to and from the disk at any given instant.

The extension of a private network that encompasses links across shared or public networks, such as the Internet.

Computer code that is self-replicating and ranges from annoying to destructive.

Software used to scan for and eradicate computer viruses, worms, and Trojan horses.

A network which nodes appear to be on the same subnet, and are connected by a WAN.

A portion of a physical disk that functions as though it were a physically separate disk. In My Computer and Windows Explorer, volumes appear as local disks, such as drive C or drive D.

New system objects in the version of NTFS included with Windows 2000 that represent storage volumes in a persistent, robust manner. Volume mount points allow the operating system to graft the root of a volume onto a directory.

Virtual Private Network. A data network that makes use of the public telecommunication infrastructure, maintaining privacy.

Refer to L2TP, PPTP.

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