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Java Programming by Hari Mohan Pandey

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20Networking in Java

20.1 HOW DO COMPUTERS TALK TO EACH OTHER VIA INTERNET?

The Internet is composed of millions of computers, located across the globe, communicating and transmitting information over a variety of computing systems, platforms and networking equipment. Before communicating with another party, one must first know how to address the message so they can be delivered correctly. On IP networks, the addressing scheme in use is based on hosts and port numbers. Each of these computers (if they are connected via an Internet) will have a unique IP address.

A given host computer on an IP networking has a hostname and a numeric address. Either of these, in their fully qualified forms, is a unique identifier for a host on the network. The ...

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