what is the difference between Internet, ethernet, intranet and extranet?

Answer 1

Internet history is interesting, if for nothing else than it's fascinating to see how far we've come in so short a time. Read this short history of the Internet, and learn more about the Internet history timeline.

1957:The United States Department of Defense formed a small agency called ARPA (Advanced Research Projects Agency) to develop military science and technology.

1961-1965:The Massachusetts Institute of Technology (MIT) started to research sharing information in small, phone-linked networks. ARPA is one of their main sponsors.

1966: The first ARPANET plan is unveiled by Larry Roberts of MIT. Packet switching technology is getting off the ground, and small university networks are beginning to be developed.

1969:The Department of Defense commissions the fledgling ARPAnet for network research.

Internet - A global network connecting millions of computers. More than 100 countries are linked into exchanges of data, news and opinions.
Unlike online services, which are centrally controlled, the Internet is decentralized by design. Each Internet computer, called a host, is independent. Its operators can choose which Internet services to use and which local services to make available to the global Internet community.

Ethernet was originally developed at Xerox PARC (Palo Alto Research Center) Laboratories in the 1970s. Robert Metcalfe was charged with the responsibility of networking a group of computers that could all use a new laser printer that Xerox had developed. Xerox also had just developed what was probably the first personal workstation, and had a need to network more than the usual two or three computers that you would find in a single building during that time.

Extranet - refers to an intranet that is partially accessible to authorized outsiders.
Intranet - resides behind a firewall and is accessible only to people who are members of the same company or organization.
Ethernet - The standard local area network (LAN) access method.

Intranet. By understanding the workings of an Intranet, which is simply a scaled down version of the real thing, you can understand the Internet better. No one will let you fiddle around with their Routers on the Internet, but if you set up an Windows NT™ Router like we did, you can do anything you want!

It's a rare occasion in the short history of computing when the bulk of programmers have to radically upgrade and revamp their skills, when a paradigm shift in programming occurs. This is one of those moments and if you don't adapt to the changes brought upon by the Internet, prepare to become extinct!

Intranet are being pushed heavily by technology vendors, but the experience from the many portal managers contacted is that technology only accounts for about one-third of the issues they had in implementing their portals. Organizational issues and company politics account for two thirds.

Answer 2

cyber web is the community that link the full international at the same time. Intranet is the community interior an company. Say, a company. Ethernet is the netwotk format of the intranet. Extranet is a community which hire the internet to proportion deepest information in a secure way. It behaves as an intranet very almost, yet hire the internet to maintain networking value.