Archives: Theory

Validation

Validation is an automatic check to ensure that data entered is sensible and feasible. Validation cannot ensure data is accurate. When programming, it is important that you include validation for data inputs. This stops unexpected…

Database Validation

Validation is an automatic check to ensure that the data entered is sensible and feasible. Validation cannot ensure data is actually accurate. Database Management Systems allow for some handy validation methods to be implemented. These…

Database Queries

A major benefit of storing information in a database is the ability to perform queries. A query is the tool that allows us to ask the database a question and get back any matching records…

Logic Circuits

What is a logic circuit? When logic gates are connected they form a circuit.  Logic circuits are designed to perform a particular function, understanding the nature of that function requires a logic circuit truth table. How…

Memory and Storage

Computer memory / storage can be classified in three ways; primary, secondary and off-line. Primary Primary memory is the computer’s main memory, which is directly accessible by the CPU and often much faster than secondary storage….

Internet Service Provider

An Internet Service Provider (ISP) is a company that provides users with access to the internet. It would be impractical and costly for individuals and most companies to connect to the internet infrastructure directly, hence the…

DOS Attack

Denial of service attacks (DOS attack) are carried out with the intention of stopping legitimate users from accessing a webserver or network. The denial of service is achieved by individual computers flooding a network or…

Pharming

Pharming is a term used to describe a cyber scam where malicious code redirects a user to a fake website without their knowledge. Unlike phishing, pharming scams do not occur as a result of the user…

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