Flashcards
Importance of Computers
Cards in this deck (10)
- 1ReliabilityHow far you can depend on the computer system being available when you need
it. Usually measured in terms of availability. - 2AvailabilityThe proportion of time that a system is operational, usually expressed as a
percentage over a period of time. E.g. 95% measured over one year. - 3MTBFMean Time Between Failure: a measure of availability often quoted by hardware
manufacturers. For example 2.56 years between failures means that, on average,
the hardware can be expected to last 2.56 years before it goes wrong. - 4RedundancySpare hardware components are built into a system so that, in the event of a
component failing, the system can swap over to the spare one.
(Discussed in Chapter 6: Networks) - 5Disaster RecoveryWhere a company has plans to replace a system quickly if there is a catastrophe
(fi re, fl ood, bomb etc). Designed to minimise the time the system is down.
(Discussed in Chapter 6: Networks) - 6Industry StandardsSet by recognised non-commercial organisations e.g:
ANSI
IEEE
ITU
ISO - 7De Facto StandardsDe Facto Standards develop over time because of common usage e.g:
QWERTY Keyboards
Microsoft Word
PostScript
Basically De Facto Standards are there to make things easier. - 8De Jure StandardsDe Jure Standards are universally accepted so they have to be kept to or communication is impossible e.g:
PDF
The 801.11 Wireless standard
Unicode
"De Jure" means by law meaning they or it needs to be followed. - 9Proprietary StandardsProprietary Standards are owned by an organisation. They ensure compatability between the company products e.g. Apple computers lock users into using the Apple Software
- 10Open StandardsOpen Standards are: Publicly available; Produced collaborativly; Not determined by one interset groups; Not for profit and available free of charge; Sufficiently detailed to allow more ability between the developers that use them
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- Flashcards on Importance of Computers, created by 300301cn on 12/06/2015.
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