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GCSE COMP . J > Booklet > Flashcards

Booklet Flashcards

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1
Q

Character set

A

Numeric code which each keyboard character is given and is then converted into binary

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2
Q

ASCII

A

Character set

Represents 128 characters in 7 bits

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3
Q

Unicode

A

Character set

Represents characters in 16 bits ( good for all languages and emojis)

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4
Q

Resolution

A

Concentration of pixels per inch

dpi

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5
Q

Pixels

A

Dots that make up a pic

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6
Q

Colour depth

A

Number of bits per pixel

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7
Q

Same rate

A

The number of times the height of a sound wave is sampled per second

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8
Q

Sample interval

A

Time between each sample

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9
Q

Bit rate

A

Amount of space available to store each sample

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10
Q

Field

A

A characteristic of something stored in a database e.g. Surname , DOB

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11
Q

Entity

A

The real world thing that we store data about e.g. Cars , students , emplyoees

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12
Q

Record

A

All the data about one thing in a database e.g your school record

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13
Q

Primary key

A

A Unique field to ensure that there is at least one field that is never duplicated

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14
Q

Foreign key

A

The primary key from a linked table

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15
Q

Data redundancy

A

Same data is present in more than one table

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16
Q

Data inconsistency

A

More than one copy of the same data and some of the data is different

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17
Q

Topology

A

Arrangement of nodes and connections in a network

18
Q

Router

A

Connects computer and other network capable devices together to form a network . Forwards packets to make sure they reach destination.

19
Q

Modem

A

Connects a computer to the Internet via a telephone line

20
Q

Hub

A

Connects devices in LAN

Sends packets to everything in network except sender
Less efficient and less private

21
Q

Switch

A

More powerful than hub , better for larger networks

Has lots of ports to connect devices in LAN

Forwards packets to intended destination ONLY using MAC address

22
Q

WAP

A

To connect wirelessly to a network . Built into routers

23
Q

NIC

A

Built into a computer to connect to a network

24
Q

Protocols

A

Set of rules that control communication between device e.g. TCP/IP , DNS

25
Q

IP address

A

A number that identifies a device on a network (will not have same IP address each time it connects

26
Q

MAC address

A

Address of the device . Hard coded into the NIC

27
Q

Packets

A

Data which is split up and reassembled when it reaches its destination

28
Q

DNS

A

Domain Name System

Protocol that connects IP addresses to user friendly names such as bbc.co.uk

29
Q

Advantage of DNS

A

No need to remember IP addresses

IP address can be changed or upgraded without having to change the Domain name

30
Q

HTML

A

Text file containing text to be displayed on a webpage. Uses tags. It’s a standard and ensures content is displayed regardless of browser

31
Q

GIF

A

Lossless

32
Q

Assembly language

A

Low level code that uses mnemonic codes

33
Q

Machine code

A

Instructions in binary used by CPU

34
Q

Opcode

A

The part of a machine code instruction that tells the processor the job that needs to be done (e.g. Add, subtract )

35
Q

Operand

A

The part of a machine code instruction that tells the processor what to apply the job to (e.g. Specific piece of data or place in memory )

36
Q

Antivirus

A

Program that detects and eliminates malicious software

37
Q

Firewalls

A

Restricts unwanted network addresses

38
Q

Spyware

A

Software that fathers and sends info about a host

39
Q

Firewall

A

Restricts unwanted network addresses

40
Q

Form

A

An input screen allowing chosen data to be displayed and edited. Uses text boxes or drop down lists. When edited, changes are updated in database

41
Q

Difference between router and switch

A

Router revives and sends packets between networks

Switch over ONE network

GCSE COMP . J (1 decks)

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