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  • DB25 connector

    DB25 plugs The DB25 (originally DE-25) connector is an analog 25-pin plug of the D-Subminiature connector family (D-Sub or Sub-D). As with the DB9 connector, the DB25 is mainly used for serial connections, allowing for the asynchronous ... Read more

    Cables and connectors
    October 16, 2008 at 09:43 AM
  • HTML document layout

    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 most ... Read more

    HTML
    October 16, 2008 at 09:43 AM
  • Replay attack

    Replay attack "Replay" attacks are "Man in the middle" attacks that involve intercepting data packets and replaying them, that is, resending them as is (with no decryption) to the receiving server. As a result, depending on the context, ... Read more

    Attacks
    October 16, 2008 at 09:43 AM
  • Intranet and Extranet

    Intranet An intranet is a set of Internet services (for example a web server) inside a local network, i.e. only accessible from workstations of a local network, or rather a set of well-defined networks that are invisible (or inaccessible) ... Read more

    e-Business
    October 16, 2008 at 09:43 AM
  • Programming Languages

    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

    Programming
    June 19, 2018 at 06:40 PM
  • Multichannel audio (5.1, 6.1, 7.1)

    Multichannel audio The term "multichannel audio" refers to the use of multiple audio tracks to reconstruct sound on a multi-speaker sound system. Two digits separated by a decimal point (2.1, 5.1, 6.1, 7.1, etc.) are used to classify the ... Read more

    Audio
    October 16, 2008 at 09:43 AM
  • MS DOS Files and directories

    Files in MS DOS In a computers data is stored in files. When you run a program, MS-DOS processes the data stored in the file and passes it to the system. In MS-DOS a file can be any size, however the file name is more restricted, it can ... Read more

    MS Dos
    October 16, 2008 at 09:43 AM
  • Computer - Introduction to Memory

    The Role of Memory The term "memory" applies to any electronic component capable of temporarily storing data. There are two main categories of memories: internal memory that temporarily memorises data while programs are running. Internal ... Read more

    Computer
    November 1, 2012 at 04:15 PM
  • Risks related to wireless WiFi networks (802.11 or Wi-Fi)

    Lack of security Radio waves intrinsically have the power to propagate in all directions, with a relatively wide range. Because of this, it is very difficult to keep radio broadcasts confined to a limited area. Radio propagation also ... Read more

    Wifi
    October 16, 2008 at 09:43 AM
  • Creating an RJ45 crossover cable

    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

    Cables and connectors
    October 16, 2008 at 09:43 AM
  • Network equipment - The hub

    What is a hub? A hub is an element of hardware for centralising network traffic coming from multiple hosts, and to propagate the signal. The hub has a certain number of ports (it has enough ports to link machines to one another, usually 4, ... Read more

    Local Area Network
    October 16, 2008 at 09:43 AM
  • ASCII Code

    Data coding What is ASCII code? ASCII Character Chart Extended ASCII Character Chart EBCDIC code Unicode Data coding Morse code was the first code used for long-distance communication. Samuel F.B. Morse invented it in 1844. This code is ... Read more

    Encoding
    November 12, 2012 at 12:40 PM
  • User management in Windows NT

    The notion of a user Windows NT is an operating system which manages sessions, meaning that when the system is started, it is necessary to log in with a user name and password. When Windows NT is installed, the administrator account is ... Read more

    Windows NT (XP,Vista,...)
    March 15, 2018 at 03:20 PM
  • Information systems governance (IT Governance)

    The Concept of Governance The term "Governance" specifies the ability of an organization to be able to control and regulate its own operation so as to avoid conflicts of interest related to the division between beneficiaries (shareholders) ... Read more

    Information System
    October 16, 2008 at 09:43 AM
  • Private-key (or secret-key) cryptography

    Symmetric encryption Symmetric encryption (also called private-key encryption or secret-key encryption) involves using the same key for encryption and decryption. ... Read more

    Cryptography
    October 16, 2008 at 09:43 AM
  • Introduction to Spreadsheet Concepts

    What is a Spreadsheet? A spreadsheet (or spreadsheet program) is software that permits numerical data to be used and to perform automatic calculations on numbers contained in a table. It is also possible to automate complex calculations by ... Read more

    Spreadsheet
    October 16, 2008 at 09:43 AM
  • Operating Systems - MS-DOS - Commands

    Command Description dir lists the contents of a folder cd changes folder cd .. parent folder md or mkdir creates a new folder deltree deletes a folder and all sub-folders copy, xcopy copies a file move moves a file del deletes a file type ... Read more

    MS Dos
    October 16, 2008 at 09:43 AM
  • Hard drive

    The role of the hard drive Structure How it works Block mode 32-bit mode Technical specifications The role of the hard drive The hard drive is the component which is used to permanently store data, as opposed to RAM, which is erased ... Read more

    Computer
    November 7, 2012 at 09:23 AM
  • MKV format (Matroska Video)

    MKV format The MKV format (Matroska Video) is an entirely free video format. More precisely, it is a container (hence the name Matroska, in reference to the Russian dolls contained within another) making it possible to contain video (DivX, ... Read more

    Video
    October 16, 2008 at 09:43 AM
  • Substitution cipher

    Substitution cipher Substitution cipher involves replacing one or more entities (generally letters) in a message with one or more other entities. There are several types of substitution cryptosystems: Monoalphabetic substitution involves ... Read more

    Cryptography
    October 16, 2008 at 09:43 AM