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An Internet address (IP address) is a unique 32-bit binary number given to a host and used for all interaction with the host. Each packet transmit across an Internet contains the 32-bit IP address of the sender (source) as well as the receiver (destination).
THE IP ADDRESS HIERARCHY:
Each 32-bit Internet address is divided into two parts:
It shows the physical network to which the computers are attached.
It shows an individual computer on the network.
The physical network in an Internet is given a unique value called as a network number. No two networks can be given the same network number and no two computers on the same network can be given the similar suffix. A suffix number can be used on more than one network.
The IP address architecture guarantees two important rules:
1. Each computer is given a unique address.
2. Although IP address assignment must be coordinated globally, suffixes may be given locally.
Physical layers defines with synchronizing the 1s and 0s on the wire.
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