Introduction to Computing, Part 12
Question 1: Describe the security issues associated with wireless signals and networks.
Answer 1: A wireless signal is less secure than a signal that travels through a cable because it can be accessed to some extent by anyone who is in range. Many domestic users of wireless Internet access have their signal stolen by their neighbors. To prevent this, and to safeguard their own data, users should encrypt their Internet activity. Many wireless networks are also subject to interference from portable phones and microwave ovens, which prevents data from being transmitted coherently.
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Question 2: Define control structure and explain how to have program instructions performed in the proper order.
Answer 2: In computer programs, control structures are the sets of instructions that establish the order in which instructions are to be executed. The normal order in which a program proceeds is known as the sequential execution. When the computer program follows sequential execution, it is executing instructions in the same order as they were written. An algorithm is capable of rearranging the order of execution or omitting certain instructions entirely. In addition, some programming algorithms command the computer to repeat instructions indefinitely.
Question 3: Explain a sequence control structure and the GOTO command.
Answer 3: A sequence control structure rearranges the order in which a computer processor performs instructions. It issues a GOTO (“go to”) command, which tells the processor to proceed to another place in the instruction sequence. The user first enters the GOTO command, and then enters the instruction that should be executed next. Once this sequence control structure has been entered, the computer skips over any intervening structures.
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