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2
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A barrier between a network and the Internet through which only authorized users can pass; set of security policies to screen incoming and outgoing messages; also used to isolate one part of a network from another.
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4
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Sonar concept implemented with the Echo Request and Echo Reply application; basic connectivity test between two TCP/IP network devices.
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6
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Number of times a wave repeats a cycle in a one-second period; measured in cycles per second, or hertz.
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9
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Desk space of the computer system; microchips located on the motherboard that hold data and instructions for the CPU (central processing unit).
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10
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specification that allows mobile phones, computers, and PDAs to be connected wirelessly over short ranges
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11
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Can hold over seven times as much information as CDs; drives are backward- compatible with CD-ROM drives.
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14
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Large data storage devices permanently mounted in the computer's case.
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16
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Logical address assigned to every workstation, server, printer, and router on any interconnected network.
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18
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Set of rules used to control the exchange of information that is understood by the transmitter and receivers.
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20
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typical form of xDSL telephone companies offer to residences
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1
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client applications that access WWW servers
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3
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Network that operates within a small geographic area, usually within a building, office, or department.
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5
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An artificial demarcation point or interface point between communications entities.
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7
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keeps data the processor is likely to need quickly close at hand; increases processor operation speed
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8
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optical storage device read by lasers; can hold up to 700 megabytes of data
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10
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the standard size of data in a computer; 8-bits
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12
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Brain of the computer system where calculations and decisions are made; also referred to as the CPU.
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13
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A unit of information storage; not to be confused with MB or megabytes.
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14
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Physical devices located on a desk or in a server-room rack.
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15
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Most commonly used protocol designed to change the packets into electrical signals that can be sent out over the wire.
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17
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contraction of the expression “binary digit”; smallest unit of data in a computer
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19
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the brain of the computer system where calculations and decisions are made; also referred to as the processor
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