HP Vectra VE C/xxx 7 HP Vectra VE C/xxx Series 7 PC - Network Administration G - Page 112

Glossary ROM Read Only Memory. Computer memory on which data have been prewritten. Once data are written to a ROM it cannot be changed and can only be read. Unlike main memory (RAM), ROM maintains its contents when power is turned off. ROM is referred to as being non-volatile, whereas RAM is volatile. server Any computer on a network that makes file, print, or communication services available to other network stations. Setup program Used to inform the computer about its configuration, for example the amount of memory installed. The setup program is stored in flash memory on the system board. SPX Sequenced Packet Exchange. SPX is an enhanced set of commands implemented on top of IPX that provides for more functions (such as guaranteed packet delivery). star topology A network topology in which all devices are connected to a central hub. Star networks are relatively easy to install and manage, but network bottlenecks can occur since all data must pass through the hub. TCP/IP Transmission Control Protocol/Internet Protocol. The Internet protocol stack_Stack that defines a wide range of network services allowing heterogeneous network system operation. TCP/IP is the default wide area network protocol used by both Microsoft Windows 95 and Windows NT. topology The geometric map of a LAN. Common LAN topologies include the bus, ring, and star. transceiver A hardware device that links a node to a baseband network cable and functions as both transmitter and receiver. twisted pair wiring Cable comprised of two wires twisted together at six turns per inch to provide electrical shielding. Some telephone wiring uses twisted pair wiring. Unicode An international character set encoding scheme defined by agreement between the International Standards Organization and Unicode, Inc., a non-profit consortium set up by a group of major computer companies, including Apple Computer, Inc., Sun Microsystems, Inc., Xerox Corp., and IBM (International Business Machines Corp.). Unicode employs a 16-bit coding scheme that allows for 65,536 distinct characters, enough to support all significant world languages, including several archaic or arcane languages such as Sanskrit and Egyptian hieroglyphs. Unicode also includes representations for punctuation marks, mathematical symbols, and dingbats, with room left for future expansion. Unicode includes ASCII as a subset. VxD Virtual Device Driver. A lowlevel software component that manages a single resource, such as a display screen or a serial port. English 112