Anything you see or hear on the Internet was broken into these packets and sent to you. The entire Internet from email to web pages and streaming video, is currently based on TCP/IP packets. When the packets arrive at the destination, they are pieced back together, and the message can be read. Each packet finds its own way from the starting machine to the destination, and if it finds itself blocked, it has the capacity to back up and find a new path. Essentially, a message is automatically broken into small parts, which are called 'packets.' A packet is labeled with its source and destination, as well as some other information. This stands for Transfer Control Protocol / Internet protocol. The earliest form of the Internet was based on an ingenious idea called TCP/IP. It was vital that there be many paths between the computers, and that messages could get through even if some of the communications hubs were brought down by the bad guys. During the height of the cold war, these computers were used in support of nuclear defense initiatives. Most businesses today use a combination of LAN and WAN technology.Īt the same time, educational and defense institutions were working on ways to connect the large research machines. Gradually, LANs became more powerful, and were often tied together to make Wide Area Networks (WANs). The personal computers could then be used again as communication tools, but only with other computers they were directly tied to. The personal computers were almost as powerful as their larger cousins, but they were intended for one person at a time, so the communication aspect was lost.Ĭlever computer users started connecting personal computers together through Local Area Networks (sometimes abbreviated LAN) and through telephone connections and special hardware devices. This communication ability turned out to be very handy, but it was largely lost when businesses and individuals turned to personal computers. This had an interesting side effect people sharing the computer could send messages to each other through it. The early computers were designed to be shared by many users at the same time.
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The explosive growth of the Internet is a clear sign of this trend. Most of us use our computers for communication rather that computation. Recently, though, we have not used computers as much for calculation. The original computers did calculations all the time. The term 'computer' originally conjured up images of behemoth machines churning out complex mathematical calculations.
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If, by some exceptionally bizarre set of circumstances you find yourself transported into the middle of a cocktail party full of Internet computer scientists, this will give you enough material to talk about so you can understand some of their jokes and slip through the buffet line before you get noticed as a neophyte. We don't intend for you to earn a degree in computer science here. There is a lot of information in this article, but don't let that intimidate you. although the Internet is a complex phenomenon, it is possible for ordinary people to understand much of its inner workings. There is actually nothing wrong with that point of view, but it can be nice to know how the 'magic' really works. Clarke once remarked that ".any sufficiently advanced technology is indistinguishable from magic." Many of us use the Internet with increasing regularity, but still see it as largely magic. How the Internet works Seeing through the magic Is it really magic?Īrthur C. It can be considered as a metropolitan area network CAN is likely to cover campus buildings such as university building and student residence halls for companies having officesĬAN-> CAN is a network made up of interconnection of LAN's. Or continents.WAN is mostly used forMNC's i.e. WAN-> WAN is a Wide Area Network which covers a large area such as two countries Metropolitan area networks can span up to 50km, devices used are modem and wire/cable.It is bigger than LAN.
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MAN-> MAN is a Local Area Network use to cover Large geographical Area upto citiesįor Ex:-> Connecting two offices of the same company within a city etc. LAN -> LAN is Local Area Network used to connect computers within an organisation suchĪs school or college. Here are the types of networks as follows