Files and Data Flashcards

1
Q

what is a “property” of a file

A

the information about the file itself for example the metadata

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2
Q

name 5 pieces of metadata for images

A

file format
dimensions
resolution
colour depth
locations

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3
Q

name 3 pieces of metadata for text files

A

file format
pages
word count
line count
character count

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4
Q

name 3 pieces of metadata for audio files

A

file type
duration
bit rate
sample rate
channels

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5
Q

name 4 pieces of metadata for video files

A

file type
duration
frame rate
bit rate
sample rate
changels

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6
Q

what are 3 file types of vidoes

A

MP4
MOV
AVI

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7
Q

what are 3 file types of audios

A

MP3
FLAC
WAV

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8
Q

what is compression

A

a way of reducing file size

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9
Q

what are the 2 types of compression

A

lossy and lossless

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10
Q

how does lossy compression work

A

will reduce filesize by permanently removing data

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11
Q

what is the benefit of lossy compression

A

significantly lowers filesize

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12
Q

what is the con of lossy compression

A

irreversible

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13
Q

what is lossless compression

A

uses an algorithm to lower the filesize by grouping data

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14
Q

what is a pro and a con for lossless compression

A

doesn’t reduce file size as much
reversible

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15
Q

what are the 4 types of data errors

A

general input error
transcription error
processing error
transmission error

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16
Q

what is a general input error

A

occurs when a customer incorrectly enters data into a form

17
Q

what is a transcription error

A

when a data entry clerk makes a mistake such as misspelling

18
Q

what is a processing error

A

a mistake in the program which creates a logic error

19
Q

what is a transmission error

A

occurs during when data is being transferred

20
Q

what is data validation

A

checking the data entered is accurate

21
Q

what are 2 traditional data verification methods

A

manual proofreading
double entry

22
Q

what is manual proofreading and how does it work

A

when somebody manually checks that the data has been entered correctly

23
Q

what is double entry and how does it work

A

getting the user to enter in data twice to make sure that there are no errors

24
Q

what are 4 new methods of data verification

A

enter password twice
CAPTCHA
2FA
memorable information

25
Q

what is CAPTCHA and how does it work

A

this uses an image that the user must identify, it helps identify whether the data is being entered by a human or a robot

26
Q

what is 2FA

A

two-factor authentication is when 2 devices are used to check whether it is the real user logging in, for example, a text can be sent to your phone with a code that needs to be entered into your computer

27
Q

what are the 6 data verification checks

A

format
range
presence
type
lookup table
length check

28
Q

what is format check, and an example

A

checks that data has been entered in the correct format form example LLN NLL

29
Q

what is a range check

A

checking that the data entered is between a certain range

30
Q

what is a presence check

A

checking that a data field has not been left empty

31
Q

what is a type check

A

checks that data entered is of a certain type

32
Q

what is a lookup table

A

checks that data is in a table of acceptable values