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A 2.1.4 Network Protocols

A protocol is an agreed set of rules for how data is formatted, sent and understood. Because both ends follow the same rules, devices made by different companies and running different software can still communicate. The syllabus names five protocols across two layers of the TCP/IP model. At the transport layer, TCP and UDP decide how data is carried between two devices. At the application layer, HTTP, HTTPS and DHCP...

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