Network Types
LAN (Local Area Network)
A LAN (Local Area Network) is a system whereby individual PCs are connected together within a company or organisation. For instance if ten people are working together within an office it makes sense for them all to be connected. In this way, the office can have a single printer and all ten people can print to it. In a similar way, other devices such as modems or scanners can be shared. Even more useful is the ability to share information when connected to a network.
WLAN (Wireless Local Area Network)
A WLAN (Wireless Local Area Network) allows you to connect to other computers within your
LAN using wireless technology.
WAN (Wide Area Network)
A WAN (Wide Area Network) as the name implies allows you to connect to other computers over a wider area (i.e. the whole world).
Client/server networks
This term relates to the type of network where resources are kept centrally on the server and used locally by the client. The server tends to be a very powerful PC (or group of PCs), while each client
workstation, which the users have, is less powerful.
Internet
The Internet is a global network of interconnected networks. The unique thing about the Internet is the sheer amount of information which you can access from it. Whatever your interest, you can search for and find information on the most obscure topics. For research the Internet is an incredibly valuable tool. Whether you are gathering information about a rival company on the other side of the world, or are looking for information about your family tree, you will find there is plenty of information available. If you publish material on the Web, it can be accessed by everyone on the Web (providing they can find it.). As a marketing tool, this has interesting possibilities. It is possible for a small company to sell products and services worldwide, without the need for a single sales‐person. These days the problem is often not finding information but rather dealing with the sheer amount of information which is available. Also, you have no idea how accurate or up to date a lot of the information you access really is.
World Wide Web (WWW) vs. the Internet
The World Wide Web (WWW) is just a small part of the Internet as a whole. The Internet relates to all the hardware and software involved, as well as the WWW, it also includes FTP (File Transfer Protocol), email and newsgroups. The WWW is basically the text and pictures which you can view using your web browser, such as Microsoft Internet Explorer, or Netscape Navigator.
Intranets
An Intranet is a smaller, closed version of the Internet, which can only be accessed by authorised members of an organisation. Intranets are becoming an increasingly popular way to share information within a company or other organisation. An Intranet uses Internet technologies to allow users to access company documents, search databases, schedule meetings and of cour
se send emails. Once a company has installed a comprehensive Intranet many users need only one piece of software on their PC, a web browser.
Extranets
An Extranet is an Intranet which is partially accessible to authorised outsiders. An Intranet is normally only accessible by members of the same company or organisation; an extranet also allows outsiders who have been issued with a password to gain limited access to information held on a company network. Extranets are being used as a way for business partners to share information.
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