Visit to an Internet Website Explained
If any user is interested to look out any particular document then he/she needs to type the address of that document into his/her web browser, or needs to click on a link in a web page of that document. After typing the address the request is handled by the Hyper Text Transfer Protocol (HTTP) and sent over the Internet to the server that has the document. After the proper completion of the whole process the server will respond by sending that document.
Now let's move further on the discussion of some important tools that help one to visit on the internet.
1. HTTP:
It means Hyper Text Transfer Protocol. It is part of the Internet Protocol (IP) group and is used by a "client," such as a web browser, so as to ascertain the connection with the server that hosts a particular webs
ite. After that the server monitors TCP port 80 as it waits for incoming requests.
2. TCP:
TCP refers to as Transmission Control Protocol. Connections on the Internet that allow 2 computers to exchange data are created by the Transmission Control Protocol. TCP is operational so as to recognize the requesting computer and then finally transfer the data to its ultimate destination.
Stages between the Servers to the Web Browser:
There are many TCP ports that are easily available with consistent uses example TCP Port 21 is generally kept aloof for FTP (File Transfer Protocol) in order to upload and download files. There is one Port 80 generally used for HTTP.
As soon as a server gets a request on TCP port 80 in form of GET / HTTP/1.1, then it will revert with a response code, and that depends upon whether the requested web page is available or not.
It is necessary that the "host" must be specified to differentiate between websites that are hosted on shared servers.
Thus, when it is found that the web page is sent via TCP, as a series of data packets-each with a header that specifies its destination and its is always in the data stream. There are various packets that can take different paths to reach their destination.
Each of the packets is sent through a router, which polls other routers which are quite near by. In case a connection with the first router is not available, then in that case data is chosen to be sent through another router. This enables data to reach its destination as earliest as possible.
As soon as the web browser receives the data, it sends back a response. By this it is ensured that all the packets have been received within a certain time or not. In case it is found they are not send then, they will be re-transmitted by the server. Another role of TCP is that it also checks to be sure the data is well protected and safe.
Thus after the above steps are over the data is then reassembled in the required order and for this all credit goes to sequence number of each data packet.
Finally the most memorable moment! Now one's web page appears on his/her computer screen, within a fraction of minute. So cheers!!
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3.22 Copyright (C) 2007 Alain Georgette / Copyright (C) 2006 Frantisek Hliva. All rights reserved."
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