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  • NAT- Network address translation, port forwarding and port trigg

    The principle of NAT Network address translation or NAT was developed in order to respond to the shortage of IP addresses with IPv4 protocol (in time the IPv6 protocol will respond to this problem). In fact, in IPv4 addressing the number ... Read more

    Internet (protocols)
    October 16, 2008 at 09:43 AM
  • Processor

    Introduction Operation Instructions Registers Cache Memory Control Signals Functional Units Transistor ... Read more

    Computer
    August 21, 2013 at 12:56 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
  • Partition - Partitioning a hard drive

    What is a partition? The partitioning of a hard drive occurs after the drive has been physically formatted but before it is logically formatted. It involves creating areas on the disk where data will not be mixed. It can be used, for ... Read more

    Computer: maintenance
    April 28, 2009 at 06:04 AM
  • Introduction to Microsoft Windows

    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

    Windows
    October 16, 2008 at 09:43 AM
  • 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
  • TCP session hijacking

    TCP session hijacking "TCP session hijacking" is a technique that involves intercepting a TCP session initiated between two machines in order to hijack it. In that the authentication check is performed only when opening the session, a ... Read more

    Attacks
    October 16, 2008 at 09:43 AM
  • Data tampering attacks

    Most web application attacks involving soliciting a website with manually entered data to generate an unexpected context. Web application parameters The HTTP protocol, a communication protocol on the web, makes it possible to convey ... Read more

    Attacks
    October 16, 2008 at 09:43 AM
  • Types of connectors

    5-pin DIN plugs A DIN (or DIN5) connector is a plug with 5 pins, formerly used to connect keyboards to computers: ... Read more

    Cables and connectors
    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
  • Positioning elements in CSS

    Using style sheets along with the and tags, you can specify the location of text or images down to the pixel. This is possible with versions 4 and higher of Netscape and Internet Explorer; however, the technique is still problematic and may ... Read more

    CSS
    October 16, 2008 at 09:43 AM
  • 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
  • Network cards

    What is a network card? What is the role of a network card? Preparing data The role of the identifier Other ... Read more

    Computer
    November 7, 2012 at 08:19 AM
  • Data transmission - Analogue transmission

    The principles of analogue transmission Analogue data transmission consists of sending information over a physical transmission medium in the form of a wave. Data is transmitted via a carrier wave, a simple wave whose only purpose is to ... Read more

    Data transmission
    October 16, 2008 at 09:43 AM
  • RTP/RTCP protocols

    Document written by Nico VanHaute, Julien Barascud and Jean-Roland Conca Introduction: What are RTP and RTCP? The spread of computers, added to the availability of cheap audio/video computer hardware, and the availability of higher ... Read more

    Internet (protocols)
    October 16, 2008 at 09:43 AM
  • Propagation of Radio Waves (802.11)

    Propagation of Radio Waves In order to be able to install a wireless network, and in particular to place the access points so as to get the best range possible, a little background should be given on how radio waves propagate. Radio waves ... Read more

    Wireless
    October 16, 2008 at 09:43 AM
  • CCM - Who we are

    Welcome to We are France's number one tech website (CommentCaMarche.net). Every day, millions of users ... Read more

    About Us
    September 15, 2017 at 07:08 AM
  • Spreadsheets - Data Entry

    Cell Content A cell of a worksheet can contain a value or be empty. The value of a cell has two essential characteristics: a type, which means the intrinsic type of the data. There are generally three types of values: numeric values, for ... Read more

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

    Introduction to attacks Any computer connected to a computing network is potentially vulnerable to an attack. An "attack" is the exploitation of a flaw in a computing system (operating system, software program or user system) for purposes ... Read more

    Attacks
    October 16, 2008 at 09:43 AM
  • Preparatory phase of a project

    The preparatory phase The term preliminary project is generally used to refer to all preparatory stages necessary for the launch of the project. Thus, the idea is to precisely define the nature of the project in order to finalize the ... Read more

    Project management
    October 16, 2008 at 09:43 AM