Wednesday, June 1, 2016

2016/2017 NECO May/June Data Processing Questions & Answers Posted Here [02/06/2016]

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DATA PROCESSING OBJECTIVES
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2a
Computer virus:
A computer virus is a malware program that, when executed, replicates by inserting copies of itself (possibly modified) into other computer programs, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be “infected”. Viruses often perform some type of harmful activity on infected hosts, such as stealing hard disk space or CPU time, accessing private information, corrupting data, displaying political or humorous messages on the user’s screen, spamming their contacts, logging their keystrokes, or even rendering the computer useless. However, not all viruses carry a destructive payload or attempt to hide themselves—the defining characteristic of viruses is that they are self-replicating computer programs which install themselves without user consent.
Virus writers use social engineering and exploit detailed knowledge of security vulnerabilities to gain access to their hosts’ computing resources. The vast majority of viruses target systems running Microsoft Windows, employing a variety of mechanisms to infect new hosts, and often using complex anti-detection/stealth strategies to evade antivirus software.

(3ai)
Relational database is a digital database whose organization is based on the relational model of data, as proposed by E. F. Codd in 1970.

(3aii)
-Tables
-forms
-queries

(3aiii)
A program file refers to sets of instructions that are put together to build up the application you will be using. Several files are linked between each other to see the application that pops in your screen.
A data file is basically the application's feeding as it provides what is needed for your program to work and convert single pieces of data on understandable information.

(3bi)
Two way, real-time transmission of audio and video signals between specialized devices or computers at two or more locations via satellite (wireless) over a network such as a LAN or
internet.

(3bii)
1. No time constraint:
2. Dramatic travel saving:
3. Easy communication:
4. Increased productivity: 

3iii)
A program file refers to sets of instructions that are put together to build up the application you will be using. Several files are linked between each other to see the application that pops in your screen.
A data file is basically the application’s feeding as it provides what is needed for your program to work and convert single pieces of data on understandable information.

3biii)
As a term, teleconferencing alludes to the act of conducting a conference with several individuals who are in different locations as opposed to just one place at the same time. Telephones, computers, televisions (video), internet and radio are some of the tools that are utilized to successfully carry out a teleconference. Videoconferencing, while referring to the aforementioned way of conferencing restricts itself to the utilization of video, implying the ability to see and hear all the participants in the conference

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