Unicode over ASCII
Can represent wider range of characters and represent characters from a wider range of languages
Pixel
Smallest part of an image
Sample Rate
Number of samples taken per second
Sample Resolution
Number of bits per sample
Hertz
One sample per second
Run Length Encoding
Number of consecutive pixels of same value gets counted which consists of a run length and value of pixel point in run
ALU
Executes mathematical instructions
Clock
Sends a regular pulse that controls number of instructions carried out each second
Bus
Used to transfer data from one component of CPU to another
Cache
Very fast memory and stores frequently used instructions
Control Unit
Decodes instructions and coordinates the execution of instructions
Register
Used for specific purpose on Fetch-Execute-Cycle
How Optical Disk Work
The disk rotates at a high speed and the laser head moves across the disk. Tiny bumps reflect light differently to lands. The reflected light is interpreted into 1s and 0s representing data stored on disk. Data is stored on a single spiral track
Computer Network
A group of computers connected together
Cyber Security
The processes designed to protect networks from attacks
Blagging
This is where a victim is tricked to give their data or information
Phishing
Where the victim receives and responds to a communication that appears to be from a valid source
Shouldering
Where someone watches and remembers a victim entering their security information.
Pharming
A cyberattack that redirects a user from a genuine website to a fake one.
Malware
A computer program with malicious intent
Virus
They can be spread when executed by clicking on an infected program
Trojan
A program that misleads the user into thinking it is another piece of software which when run executes another program
Spyware
A program that records data on a host system and forwards to a third party
Adware
Code attached to program files which will constantly show adverts
