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Networks

What is a Network?

• A Network exists of two or more computers that are interconnected to exchange data. For example it allows users to share data or message each other. An example of a network is the internet.
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Internet vs. internet

• The Internet is capitalized when referring to the specific Internet that we call Internet. It is not capitalized when referring to generic internets or internetworks.
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Intranet

• An Intranet is a Network which is based on TCP/IP Protocols within an organization. It is only accessible by the organizations members. A Firewall fends off any unauthorized access. Just like the Internet itself Intranets are used to share information.
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Extranet

• An Extranet is an "intranet" that allows controlled access from the outside. You can only use the extranet if you have a username and password. Your identity determines which parts of the Extranet you can view.
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Types of Networks

LAN
• LAN stands for Local Area Network. It connects the Networks devices over a relatively short distance. LAN Networks are usually used in homes, office buildings or schools. They are typically owned by a single person or an organization.
WLAN
• WLAN stands for Wireless Local Area Network.
WAN
• WAN stands for Wide Area Network. The largest WAN is the Internet. A WAN is a geographically dispersed collection of LANs. In opposite to a LAN it exists under collective or distributed ownership.
MAN
• MAN stands for Metropolitan Area Network. It is a Network that spans a larger area than a LAN but smaller than a WAN. It is used for examine in a city. It is usually owned by an entity for example a government body or a large corporation.
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