Archives: Theory

Duplex, Half Duplex and Simplex

Duplex, Half Duplex and Simplex are the three possibilities for the direction of data transmission. Simplex Simplex is data transmission in one direction only.  Two directional transmission is not possible. e.g. a radio station broadcast….

Web Server

A web server is a computer dedicated to storing web pages securely and delivering them to users when requested. A website developer would upload their website to a web server using FTP. Web servers are switched on 24…

Web Browser

The role of a web browser A web browser is a software program which allows the user to request and retrieve web pages (and other resources) from a webserver on the world wide web. Web…

Computer Ethics

Computer ethics refers to a set of principles to regulate the use of computers. Ethics has become an important consideration due to the spread of computerised systems and electronic communications. Computer ethics can be broken…

Secure Sockets Layer

Secure Sockets Layer (SSL) uses authentication and encryption to create a widely used online security protocol.  SSL allows data to be sent and received securely over the internet. SSL consists of a digital certificate, hosted…

Hacking and Malware

Hacking Hacking is the illegal access to a computer system without the owner’s consent or knowledge. In an age of networks that never sleep, hacking can be done remotely from anywhere. Hacking poses a real threat to people…

Proxy Servers

Proxy servers act as an intermediary between a user and a web server. Proxy servers have the following main functions: Using cache, they can speed up access to a website by storing the pages after the…

Firewalls

Firewalls are security systems designed to prevent unauthorised access to or from your computer or private network. Firewalls can be implemented in hardware, software or a combination of both. Firewalls sit between the user’s computer and…

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