Computer Science OCR Flashcards

rwvise

1
Q

bandwidth

A

The amount of data that can be transmitted over a period of time

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2
Q

What is LAN

A

Network that is located in a small geographical network. in a LAN you own all the hardware

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3
Q

WAN

A

The network covers a wider location, a large geographical area, made up of multiple LANs. The hardware is owned by the government.

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4
Q

Types of connection

A

Copper cable, Wi-fi, fibre-optic cable, Bluetooth. Some are faster than others, and wired is usually faster than wireless.

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5
Q

How does number devices affect a network speed.

A

The more devices connected means the bandwidth must equally spread amongst each devices, resulting in a lower bandwidth for each device.

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6
Q

interference

A

Physical walls and additional radio signals can interfere with a with a wireless connection. This slows it down.

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7
Q

Network latency

A

Measure of how long it takes for a signal to reach its destination. Latency is affected by number of devices on a network.

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8
Q

Concept of layers

A

Breaking down networking into smaller tasks that work with each other e.g your browser does not care whether you are wired or wireless. Can reduce difficulty as it smaller tasks

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9
Q

Protocols

A

A set of rules that determine how computers communicate with each other

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10
Q

Standards

A

a common standard that manufacturers agree on when making things work with each other

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11
Q

Protocols names: TCP/IP (transmission control/internet protocol)

A

Enables communication over the internet

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12
Q

HTTP(hypertext transfer protocol)

A

governs communication between a client and webserver, used to send web pages

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13
Q

HTTPS (hypertext transfer protocol secure)

A

Same as http, but encrypted to provide extra security

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14
Q

FTP (File transfer protocol)

A

Allows transfer of files between computers

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15
Q

POP (post office protocol)

A

Governs retrieving emails from email servers, and downloads

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16
Q

IMAP
Internet Message
Access Protocol

A

IMAP
Internet Message
Access Protocol

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17
Q

SMTP
Simple Mail Transfer
Protocol

A

Protocol used to send email from a web browser or
client.

18
Q

Malware

A

Suspicious software

19
Q

virus

A

infects files and needs human to spread

20
Q

worm

A

Infects the whole computer and doesnt need as human to spread

21
Q

trojan horse

A

appears to be friendly but in the backround does something bad

22
Q

spyware

A

controls hardware and utilies it

23
Q

brute force attack

A

trying to guess a password

24
Q

virtual memory

A

moves data into ssd

25
optical
uses laser to save as 1s and 0s
26
magnetic
uses magnets to get binary
27
solid state
stored on chips electronically
28
RAM
Very fats storage non volatile
29
ROM
Used to start up a computer e.g bios
30
embedded system
a small program that loops commands
31
von neumann architecture
puts program data and instructions into ram
32
clock speed
how many fetchb decode execute cyckles can be done in a second
33
number of cores
each core can be allocated to do something
34
cache
small and super fast storage that holds previously used program instructions
35
register
very small but very fast storage, used to hold data or an address
36
ALU
arithmetic logic unit, performs maths and logic checks
37
Control Unit (CU)
Directs operation of processer
38
MAR
memory address register, stores address of next data to be fetched
39
MDR
memory data register, holds the data that was fetched
40
Program counter
incremented by one each cycle, holds the new address of what is to be executed next
41
Accumulator
register that holds values of math equations