2.     FIREWALL—A security system that protects data on a LAN from hackers.

4.     TRACE—A line of conductive material (e.g., copper) on a PCB that carries an electronic signal.

6.     MACRO—A single computer instruction that generates a sequence of simpler.

9.     ARITY—A programming term for the number of arguments or operands a function or operator takes.

10.     GENERATOR—An electronic device that produces a signal voltage.

13.   PACKET—A chunk of self-contained data sent across a network.

15.     BANDWIDTH—The amount of data, measured in bits per second (bps), that can be transmitted through a channel in a given period of time.

16.     TRANSPONDER—An electrical device designed to receive a predefined signal and automatically transmit a predetermined reply.

17.     OSCILLATOR—An electronic circuit that produces or alternating current or voltage signals.

1.     HAMMING—Code named for its inventor (1915–1998) that can detect single- and double-bit errors. It can correct single-bit errors.

2.     FIFO—A storage method in which the oldest data is retrieved first.

3.     CACHE—RAM that serves as a specialized high-speed storage mechanism.

5.     RESISTOR—An electrical device that opposes the flow of current in a circuit.

7.     VARISTOR—An electrical resistor, the resistance of which varies with the applied voltage.

8.     CAPACITOR—An energy-storing device that typically includes two parallel conductive plates separated by an insulator.

11.     EMITTER—The semiconductor material in a transistor from which charge carriers originate.

12.     DONGLE—A hardware device that attaches to a computer to enable a particular software program to run.

14.     FOUNDRY—Name for a semiconductor manufacturing plant.

15.   BOOLE—The British mathematician (1815–1864) who used mathematical formulas to represent logical reasoning. He wrote “An Investigation of the Laws of Thought” (1854) and papers on calculus and differential equations.