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Network and email protocols
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Devices made by different companies can talk to each other because they follow the same rules, called protocols.
What is a protocol?
A protocol is a set of rules for how data is sent and received, such as the format of data and how errors are handled.
Without agreed protocols, devices from different manufacturers could not communicate.
Without agreed protocols, devices from different manufacturers could not communicate.
Network protocols
Email protocols
SMTP: sends email from your device to the mail server and between mail servers.
POP3: downloads email from the server to one device, usually removing it from the server.
IMAP: keeps email on the server and syncs it, so you see the same inbox on every device.
POP3: downloads email from the server to one device, usually removing it from the server.
IMAP: keeps email on the server and syncs it, so you see the same inbox on every device.
A student reads email on both a phone and a laptop and wants both to show the same messages. Which protocol suits this, and why?
- POP3 usually downloads mail to one device and removes it from the server.
- IMAP keeps messages on the server and syncs them.
Answer: IMAP, because messages stay on the server and sync across devices
Protocols are agreed rules for communication. TCP handles packets, IP handles addressing and routing, HTTP/HTTPS carry web pages, FTP moves files. SMTP sends email; POP3 downloads it; IMAP keeps it synced on the server.
The interactive lesson includes the diagrams for this topic.
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