Networking
Don't do this
3 Application Protocol Mistakes That Cost Marks
Quick: what port does HTTPS use? 3 mistakes that cost marks here
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Lesson notes
Explain how HTTP/HTTPS, SMTP and FTP work and identify their default ports
Key points
- HTTPS is a new protocol: Calling HTTPS a separate protocol loses marks; it is HTTP running over TLS encryption, port 443.
- Mixing up default ports: Students swap ports; remember HTTP 80, HTTPS 443, SMTP 25, FTP 21 for control and 20 for data.
- SMTP fetches your email: SMTP only sends and relays mail between servers; your inbox is retrieved with POP3 or IMAP instead.
Takeaway: HTTPS = HTTP over TLS, 443; SMTP sends, it doesn't fetch.
Quick check: How does HTTPS relate to HTTP when you check UMaT results online?
- A new protocol on port 80
- HTTP over TLS on port 443
- SMTP with encryption added
HTTPS is ordinary HTTP carried inside a TLS-encrypted connection, default port 443.
HTTPHTTPSclient-serverSMTP
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