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power spike The power level rises above normal for less than a second and drops back to normal.


power surge The power level rises above normal and stays there for longer than a second or two.


power underage The power level drops below the standard level. See also power sag.


PPP See Point-to-Point Protocol.


PPTP See Point-to-Point Tunneling Protocol.


Presentation layer The sixth layer of the OSI model; responsible for formatting data exchange such as graphic commands and conversion of character sets. Also responsible for data compression, data encryption, and data stream redirection. See also Open Systems Interconnect.


Pretty Good Privacy (PGP) A shareware implementation of RSA encryption. See also RSA Data Security, Inc.


Primary Domain Controller (PDC) An NT server that contains a master copy of the SAM database. This database contains all usernames, passwords, and access control lists for a Windows NT domain. See also Security Accounts Manager.


print server A centralized device that controls and manages all network printers. The print server can be hardware, software, or a combination of both. Some print servers are actually built into the network printer NICs. See also network interface card.


print services The network services that manage and control printing on a network, allowing multiple and simultaneous access to printers.


private key A technology in which both the sender and the receiver have the same key. A single key is used to encrypt and decrypt all messages.


See also public key.


private network The part of a network that lies behind a firewall and is not “seen” on the Internet. See also firewall.

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