A
ACK

The acknowledgment message sent between two hosts during a TCP session.

ACL (access control list)

The list of trustees assigned to a file or directory. A trustee can be any object that is available to the security subsystem.

Active Directory

An X.500-compliant directory services system created by Microsoft for use on Windows 2000 networks.

active hub

A hub that has power supplied to it for the purposes of regenerating the signals that pass through it.

active termination

A termination system used on a SCSI bus. Unlike passive termination, which uses voltage resistors, active termination uses voltage regulators to create the termination voltage.

address

A set of numbers, usually expressed in binary format, used to identify and locate a resource ...

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