Network Protocols (TCP/IP, HTTP, FTP, SMTP, IMAP)

A protocol is a set of rules that governs how data is transmitted across a network. Without protocols, devices from different manufacturers running different software would not be able to communicate with each other. Protocols ensure that data is formatted, transmitted and received in a standard way that all devices can understand.

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Why Do We Need Protocols?

Imagine trying to have a conversation with someone who speaks a completely different language and follows different social rules. Protocols are like a common language and set of rules that all devices agree to follow. They define:

• The format of data — how data is structured and packaged.
• The order of messages — which device sends first, how to acknowledge receipt.
• Error handling — what happens when data is lost or corrupted.
• Addressing — how to identify the sender and recipient.

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TCP/IP (Transmission Control Protocol / Internet Protocol)

TCP/IP is the fundamental protocol suite used on the internet and most networks. It consists of two main protocols that work together:

IP (Internet Protocol)