Summary

ase station 3AppleTalk A protocol suite to network Macintoshcomputers. It is composed of a comprehensive set ofprotocols that span the seven layers of the OSI referencemodel.application layer Layer 7 of the Open SystemsInterconnection (OSI) reference model. This layerprovides services to application processes such as e-mail, file transfer, and terminal emulation that areoutside the OSI reference model. The applicationlayer identifies and establishes the availability ofintended communication partners and the resourcesrequired to connect with them. It also synchronizescooperating applications and establishes agreementon procedures for error recovery and control of dataintegrity. It corresponds roughly with the transactionservices layer in the Systems Network Architecture(SNA) model. The OSI reference model includes theapplication layer, presentation layer, session layer,transport layer, network layer, data link layer, andphysical layer.application software A program that performs aspecific function by accepting input from the userand then manipulating it to achieve a result, knownas the output.A low-arm (Acorn RISC Machine) architecturepower RISC CPU.Asymmetric DSL (ADSL) Currently the mostcommon DSL implementation. Speeds vary from 384kbps to more than 6 Mbps downstream. Theupstream speed typically is lower.asymmetric encryption A method of encryptingdata on a network. Uses a private key to write messagesand a public key to decode the messages. Onlythe private key needs to be kept secret. Public keyscan be distributed openly.attention (AT) command set Issues dial, hang-up,reset, and other instructions to the modem. It is basedon the Hayes command set.attenuation The distance a signal can travel beforeit is too weak to be read.Automatic Private IP Addressing (APIPA) Anoperating system feature that enables a computer toassign itself an address if it is unable to contact aDHCP server. The Internet Assigned NumbersAuthority (IANA) has reserved private IP addressesin the range of 169.254.0.0 to 169.254.255.255 forAPIPA.Automatic Update A utility to schedule theWindows Update feature to check for criticalupdates.auxiliary (AUX) power connector A four-, six-,or eight-pin connector that supplies extra voltage tothe motherboard from the power supply.Bbackplane A physical connection between aninterface processor or card, the data buses, and thepower distribution buses inside a chassis.backup A copy of data saved to alternate media.Should be physically removed from the source data.backward-compatible Hardware or software systemsthat can use interfaces and data from earlierversions of the system or with other systems.bandwidth The amount of data that can be transmittedwithin a fixed amount of time.base station A device that attaches a laptop to ACpower and to desktop peripherals.