Glossary of The Internet 4th Edition - Tutorial 1

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Acceptable use policy (AUP)
The policy of a school or employer that specifies the conditions under which its students and/or employees can use their Internet connections. WEB 1.26-1.27, 1.28, 6.09
Advanced Research Projects Agency (ARPA)
The U.S. Department of Defense agency that sponsored the early research and development of technologies and systems that later became the Internet. WEB 1.09
The wide area network (WAN) created by DARPA in 1969 that grew to become the Internet. WEB 1.11 - also see Defense Advanced Research Projects Agency (DARPA).
Asymmetric Digital Subscriber Line (ASDL or DSL)
A new type of digital subscriber line (DSL) that offers transmission speeds ranging from 16 to 640 Kbps from the user to the telephone company and from 1.5 to 9 Mbps from the telephone company to the user. WEB 1.23, 1.25, 1.29-1.30
The amount of data that can travel through a communications circuit in one second. WEB 1.21-1.25
Because It's Time Network (BITNET)
A network of IBM mainframe computers at universities founded by the City University of New York. WEB 1.11, 1.12, 1.13
Bits per second (bps)
The basic increment in which bandwidth is measured. WEB 1.21
Cable modem
A device that converts a computer's digital signals into radio-frequency analog signals that are similar to television transmission signals. The converted signals travel to and from the user's cable company, which maintains a connection to the Internet. WEB 1.29
Category 1
A type of twisted-pair cable that telephone companies have used for years to carry voice signals. Category 1 cable is inexpensive and easy to install but transmits information much more slowly than other types of cable. WEB 1.06
Category 5
(Cat-5) cable - A type of twisted-pair cable developed specifically for carrying data signals rather than voice signals. Categoty 5 cable is easy to install and carried signals between 10 and 100 times faster than coaxial cable. WEB 1.06-1.07
Cat-5e - enhanced WEB 1.07
Circuit Switching
A centrally controlled, single-connection method for sending information over a network. WEB 1.10
A computer that is connected to another, usually more powerful, computer called a server. The client computer can use the server computer's resources, such as printers, files, or programs. This way of connecting computers is called a client/server network. WEB 1.05, 2.02
Client/server network
A way of connecting multiple computers, called client computers, to a main computer, called a server computer. This connection method allows the client computers to share the server computer's resources, such as printers, files, and programs. WEB 1.05-1.06, 2.02
Coaxial Cable
An insulated copper wire that is encase in a metal shield and then enclosed in plastic insulation. The signal-carrying wire is completely shielded so it resists electrial interference much better than twisted-pair cable does. Coaxial cable also carries signals about 20 times faster than twisted-pair cable, but it is considerably more expensive. WEB 1.06, 1.07
Commerce service provider (CSP)
A firm that purchases Internet access from network access points and sells it to businesses, individuals, and smaller ISPs. A CSP usually offers additional services that help businesses conduct commerce on the Internet. Also known as an Internet service provider (ISP). WEB 1.21

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