What's an RJ45 plug? A network card may have several types of connectors, with the most common being: An RJ45 connector; A BNC connector (coaxial cable). The RJ-45 is the one which interests us here, as it it the most widely used. The... Read more
HTML document An HTML page is a simple file containing text formatted with HTML tags. Traditionally, the file is given an .htm or .html extension, but a web page may have other extensions as well. A web page can be built from even the... Read more
Description of the operating system Roles of the operating system Components of the operating system Multi-threaded systems Multi-processor systems Embedded systems Real time systems Types of operating system Description of the... Read more
A quick history of the modem The first coding to enable long distance communication was Morse, which was developed by Samuel F.B Morse in 1844. This code is made up of dots and dashes (a sort of binary language...) and made it possible... Read more
History of Windows Windows is the operating system sold by the Seattle-based company Microsoft. Microsoft, originally christened "Traf-O-Data" in 1972, was renamed "Micro-soft" in November 1975, then "Microsoft" on November 26, 1976.... Read more
Definition of polymorphism The word polymorphism comes from Greek and means having several different forms. This is one of the essential concepts of object-oriented programming. Where inheritance is related to classes and (their... Read more
Wireless Metropolitan Area Networks (WMAN) A Wireless Metropolitan Area Network (WMAN) is also known as a Wireless Local Loop (WLL). WMANs are based on the IEEE 802.16 standard. Wireless local loop can reach effective transfer speeds of... Read more
Agile methods "Agile methods" software development (also called Agile Modelling denoted AG for short) reduce software lifecycle time (thus speeding up development) by firstly developing a prototype version, then integrating... Read more
The Scanner A scanner is an acquisition peripheral for scanning documents, i.e. converting a paper document to a digital image. There are generally three types of scanner: Flat scanners let you scan a document by placing it flat against... Read more
Leased lines "Leased" lines enable transmission of data at medium and high speeds (64 Kbps to 140 Mbps) by point to point or multipoint connection (Transfix service). In Europe, there are five types of lines distinguished according to... Read more
A programming language is a language designed to describe a set of consecutive actions to be executed by a computer. A programming language is, therefore, a practical way for us humans to give instructions to a computer. Languages that... Read more
Introduction to computer monitors A monitor (or screen) is a computer display unit. There are generally said to be two families of monitors: Cathode-ray tube monitors (or CRT for short), which are used with most desktop computers. They... Read more
Trojan horses A Trojan horse is a computer program which carries out malicious operations without the user's knowledge. The name "Trojan horse" comes from a legend told in the Iliad (by the writer Homer) about the siege of the city of... Read more
Introduction to Wi-Fi (802.11) The IEEE 802.11 specification (ISO/IEC 8802-11) is an international standard describing the characteristics of a wireless local area network (WLAN). The name Wi-Fi (short for "Wireless Fidelity", sometimes... Read more
Expansion Bus Expansion buses (sometimes called peripheral buses) are buses that have connectors that allow you to add expansion cards (peripherals) to a computer. There are different types of standard internal buses that are... Read more
Environment variables An environment variable is a dynamic value loaded into the memory that can be used by several processes operating simultaneously. On most operating systems, the location of some libraries or of the main system... Read more
Introduction to Telnet Protocols and implementation Running Telnet Commands in Telnet Introduction to Telnet Telnet is a protocol for emulating a remote terminal, which means that it can be used to run commands entered on a keyboard at... Read more
Information security officer (ISO) An ISO (information security officer) is in charge of setting and a company's security policy. He/she also plays a critical role in informing, advising, and alerting the general management on matters... Read more
The Compact Disc was invented by Sony and Philips in 1981 in order to serve as a high-quality compact audio storage device which allowed for direct access to digital sound tracks. It was officially launched in October 1982. In 1984, the... Read more
The FAT16 file system The first file system to be used on a Microsoft operating system was the FAT system, which uses a file allocation table. The file allocation table is actually an index which lists the content of the disk in order... Read more
