CertiGuide to Network+  9  Glossary

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AS/400

A popular minicomputer line from IBM. Replaced the System/36 and System/38.

The character set described in ANSI standard X3.4-1977. Each character is encoded with 7 bits, an 8th bit may be used for parity checking (error detection). Very commonly found when performing data interchange between systems. OCR typically converts to ASCII. Refer to Unicode.

System extensions, programs, devices, and utilities added to a computer to make it more accessible to users with disabilities.

1. Communications utilizing a stop and start bit, as opposed to a clock

2. A form of data transmission in which information is sent and received at irregular intervals, one character at a time. Because data is received at irregular intervals, the receiving modem must be signaled to inform it when the data bits of a character begin and end. This is done by means of start and stop bits.

A high-speed connection-oriented protocol used to transport many different types of network traffic.

Abbreviation for ATtention. The AT command set was developed by Denny Hayes to control asynchronous modems. The AT command set is now the de facto standard.

Asynchronous Transfer Mode. A packet-switched, broadband network architecture that utilizes fixed cells. ATM features very high bandwidth and the ability to transmit a variety of media types efficiently. Commonly used as a backbone for the Internet, however implementation costs are still quite high.

In Active Directory, an attribute describes characteristics of an object and the type of information an object can hold. For each object class, the schema defines what attributes an instance of the class must have and what additional attributes it might have.

To track the activities of users by recording selected types of events in the security log of a server or a workstation.

Recording activity which has occurred on files or computers.

Attachment Unit Interface. Network connector utilizing fifteen pins in a D shell connector.

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