A

A-type resource record

A line (record) in a computer's Domain Name System Database

that maps a computer's domain name (host name) to an IP sddress

in a DNS zone.

ActiveX (TM)

An umbrella term for Microsoft technologies that enable developers

to create interactive content for the World Wide Web.

application programming interface (API)

A set of routines that an application program uses to request and

carry out lower-level services performed by another component, such as

the computer's operating system or a service running on a network computer.

auditing

Tracking activities of users by recording selected types of events in

the security log of a server or a workstation.

authentication

Validation of user's logon information. Authentication is used to enforce

selective permission to access resources or to perform an operation.

B

backup domain controller (BDC)

In a Windows NT Server domain, a computer running Windows NT Server

that receives a copy of the domain's directory database, which contains

all account and security policy information for the domain.

The copy is synchronized periodically and automatically with the master copy

on the primary domain controller (PDC). BDCs also authenticate user logons

and can be promoted to function as PDCs as needed. Multiple BDCs can exist

on a domain. See also domain controller: primary domain controller.

bandwidth

In communications, the difference between the highest and lowest frequencies

in a given range. For example, a telephone line accommodates a bandwidth of

3000 Hertz (Hz), the difference between the lowest (300 Hz) and highest

(3300 Hz) frequencies it can carry. In computer networks, greater bandwidth

indicates faster data-transfer capability and is expressed in bits per second (bps).

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