21) Wide-area networks (WAN)
is a network that spans a metropolitan area, usually a city and its major suburbs.
22)
Metropolitan-area network (MAN)span broad geographical distances–entire regions, states, continents, or the entire globe.
23) Twisted wire consists of strands of copper wire twisted in pairs and is an older type of transmission medium.
24) Microwave systems, both terrestrial and celestial, transmit high-frequency radio signals through the atmosphere and are widely used for high-volume, long-distance, point-to-point communication.
25) The range of frequencies that can be accommodated on a particular telecommunications channel is called its bandwidth.
26) An Internet service provider (ISP)
is a commercial organization with a temporary connection to the Internet that sells permanent connections to retail subscribers.
27) Digital subscriber line (DSL) provided by cable television vendors use digital cable coaxial lines to deliver high-speed Internet access to homes and businesses.
28) The domain name
is the English-like name that corresponds to the unique 32-bit numeric IP address for each computer connected to the Internet.
29) To connect two computers together in the same office, you must have a computer network.
30) An NOS must reside on a dedicated server computer in order to manage a network.