Statement

Almost all the datas are transmitted using either the TCP/IP or UDP protocols. I will briefly discuss about the TCP/IP and UDP structures and the IP addressing system in this article.

Let’s first start with the IP address -  Each system in the internet ( or in private network) is recognised by an unique no.  and this no. stores important informations  about the network and the type of service. TCP/IP has three different levels of addressing :

• Physical (Link) address – 6 bytes – This address determines the host system on a prticular network and can be either unicast(Single recipient) , Multicast(a group of recipients) or broadcast(received by all in network).** Not all networks support these, but Ethernet does.
• Internetwork (IP) address – 4 bytes – This address can uniquely identify a host connected to the Internet. No two hosts in the Internet can have the same address. Internet address also supports unicast,multicast and broadcast addressing.
• Transport or Port address – 2 bytes – The above two addressing system identifies the host but not the process to which the data actually corresponds to. For this a port address is used. e.g. Telnet uses port 23. (more…)