Summary

24 registryregistry A system-wide database used by theWindows operating system to store information andsettings for hardware, software, users, and preferenceson a system.remote-access server (RAS) A server that is dedicatedto users who need to gain access to files andprint services on the LAN from a remote location.remote installation services (RIS) The ability todownload a Windows operating system installationacross the network. This installation can be requestedby the user or forced onto the computer by theadministrator.removable drive A drive that can be removed froma computer to transport data.resistance (r) The measurement, expressed inohms, of the opposition of a material to the flow ofcurrent.resolution The number of distinct pixels in eachdimension that can be displayed on a computerscreen. The higher the resolution, the better qualitythe screen display is. Also called display resolution.restore point A utility in Microsoft’s WindowsMe, XP, and Vista operating systems. It allows therolling back of system files, registry keys, andinstalled programs to a previous state in the event ofsystem failure. User data is unaffected by performinga restore point.ring topology A network topology that consists ofa series of repeaters connected to one another by unidirectionaltransmission links to form a single closedloop. Each station on the network connects to thenetwork at a repeater. Although logically they are aring, ring topologies are most often organized in aclosed-loop star.router A network layer device that uses one ormore metrics to determine the optimal path alongwhich network traffic should be forwarded. Routersforward packets from one network to another basedon network layer information. Occasionally called agateway, although this definition of gateway isbecoming increasingly outdated.Routing Information Protocol (RIP) An InteriorGateway Protocol (IGP) supplied with UNIXBerkeley Standard Distribution (BSD) systems. Themost common IGP on the Internet. RIP uses hopcount as a routing metric.Ssafe mode An option when booting the system thatloads only the basic devices that Windows needs torun. It is used for troubleshooting.satellite communication The use of orbiting satellitesto relay data between multiple Earth-based stations.Satellite communications offer high bandwidthand broadcast capability at a cost that is unrelated tothe distance between Earth stations. Because of thesatellite’s altitude, satellite communications can besubject to long propagation delays.SCANDISK A Windows utility used to examineall files on a drive.Secure Shell A network protocol that allows datato be exchanged over a secure channel between twocomputers.security key fob A small radio system that communicateswith the computer over a short range. Thecomputer must sense the signal from the key fobbefore it accepts the user login name and password.security keyhole A hard point in the case that isused to attach a security cable.