Common protocols

1.3.2 Wired and wireless networks, protocols and layers

Wired and wireless networks, protocols and layers — Note 5 of 13

What you need to know

A communication protocol is a set of rules for transferring data over a network. Different protocols are used for different purposes — from web browsing to email to file transfer.

What to know

Different protocols handle different types of communication: web browsing (HTTP/HTTPS), file transfer (FTP), email (SMTP, POP, IMAP), general Internet (TCP/IP).
Protocols ensure that devices can communicate effectively, even if made by different manufacturers, by following the same rules.

Key terms

Protocol: A set of rules that govern how data is formatted, transmitted, and received over a network.
Network Protocol: A set of rules for communication between devices on a network.

Exam technique

Tip:You must know the PURPOSE of each protocol and be able to identify which protocol is used in a given scenario.
Mistake:Giving SMTP for 'checking for new emails'. SMTP is for SENDING email. POP or IMAP is for RECEIVING/checking email.

Example:Common table question — 'Viewing a news page' = HTTP/HTTPS. 'Logging into a bank' = HTTPS. 'Downloading a file' = FTP. 'Checking email inbox' = IMAP or POP (NOT SMTP).

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