3.5 - Protocols

A protocol is a set of rules that allow devices on a network to communicate with each other.

There are several vital protocols that you will need to know.

These are two protocols that combine.

TCP is a protocol that allows packets to be sent and received between computer systems. It breaks the data into packets and reassembles them into the original data at the destination.

IP is a protocol that sets out the format of packets, and it is an addressing system (a unique IP address) for devices on a network.

Transmission Control Protocol / Internet Protocol (TCP/IP)


HTTP is a protocol that can be used to transfer web pages over the Internet so that users can view them in a web browser.

HTTPS is a secure version of HTTP that works with another protocol (Secure Socket Layers (SSL)). You should see a lock symbol in your URL bar if your connection to that website is secure.

All URLs start with either HTTP or HTTPS such as https://www.csnewbs.com

Hyper Text Transfer Protocol (HTTP)


Transmission Control Protocol / Internet Protocol (TCP/IP)

File Transfer
Protocol (FTP)

FTP is used to transfer files across a network.


It is commonly used to upload or download files to a web server.


Connection Protocols

Ethernet is a protocol for wired connections that use cables such as copper or fibre optic.


An example of a protocol for wireless connections is WiFi.




Simple Mail Transfer Protocol (SMTP) is a protocol used by email applications for sending messages to a mail server.

Post Office Protocol 3 (POP3) is a protocol for receiving emails, in which email is collected and stored by an email server until a client downloads messages when ready.

Internet Message Access Protocol (IMAP) is a protocol that transfers emails between computer systems via the internet. IMAP is generally used as an alternative to POP.


Questo's Corner


a. TCP/IP is actually two different protocols. Describe the role of TCP and the role of IP.

b. What is the protocol FTP used for?

c. What is the difference between HTTP and HTTPS?

d. Name two different protocols used for connecting devices.

e. State three different email protocols.

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