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What are Ports?


On a TCP/IP network every device must have an IP address.

However an IP address alone is not sufficient for running network applications, as a computer can run multiple applications and/or services.

Just as the IP address identifies the computer, The network port identifies the application or service running on the computer.

• Analogy

If you use a house or apartment block analogy the IP address corresponds to the street address.

All of the apartments share the same street address.

However each apartment also has an apartment number which corresponds to the Port number.

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