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when two or more computers are connected, can be made up of two computers or hundreds of thousands of computers—there is no maximum size.

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one of the main types of computer networks, computers are close together, typically in the same building or office.

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connected computers are far apart—in different buildings, different cities, or even different countries.

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is a private network that looks and acts a lot like the Internet but is available only to the employees of the organization.

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allows certain customers or other “outsiders” to access areas of its intranet.

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a set of programs used to manage and secure a network.

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the rules of initiating, interrupting, and continuing communication.

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the measurement of rate of communication over a network.

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makes it possible for a computer to send data to and receive data from another computer.

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is the transmission medium by which computers in a network usually send and receive data.

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the most common cable used in LANs today.

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a type of cable that sends signals at 100 megabits per second.

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which uses light guided through thin glass tubes to send data.

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uses radio frequencies to send data.

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the central point where all of the computers on a network connect.

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is a type of hub that uses a table to keep track of destinations.

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links computers to the Internet, so users can share the connection.

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uses two unlicensed frequencies, at 5 GHz or 2.4 GHz, to communicate.

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how fast your connection to the servers are, and is provided by the service provider.

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one computer or one set of computers, the servers, are assigned a specific task—to handle all email, for example. The other machines on the network, called clients, communicate with the server(s) but do not communicate with each other.

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other machines on the network.

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have their own security settings and modifications to user connectivity, are often used for privacy and security while using the internet.

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smaller bits of information that are broken down in order to transport data through networks.

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is what happens when more than one transmitter tries to pass data along at once.

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rules, or “language,” that computers on a network agree to use 