Internet is a network of networks
Intranet is a computer-based network protocol, TCP / IP as the Internet is used only internally in the company, office, and even internet cafes (WARNET) can Categorize the Intranet. Intranet between each other can communicate with each other through an Internet backbone that provides long-distance communication. Akan but actually does not need an Intranet connection to the outside Internet to function properly. Intranet use all the protocol TCP / IP and its application so that we have "private" Internet.
If a body of business / business / institutions expose some of the internal network to the outside community, in this case called Ekstranet. Indeed, all the contents are not usually remove the intranet to the public, to make the intranet into Ekstranet. For example, we are buying software, books etc. from an e-store, then usually we can access the intranet part of the store. Agency business / company can block access to their intranet through a firewall router and laying. Firewall is a software / hardware that someone set the access into the intranet. Protection is done through a variety of parameters if the network IP address, port number etc.. If you enable the firewall in the access can be controlled so that we can only access the Intranet from any part of the company, which was then known as the extranet.
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