This key facts covers Quick Reference - Protocols Summary within Protocols for GCSE Computer Science. Revise Protocols in 3.5 Fundamentals of Computer Networks for GCSE Computer Science with 18 exam-style questions and 18 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 10 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Quick Reference - Protocols Summary
HTTP (HyperText Transfer Protocol):
- Purpose: Transfer web pages
- Port: 80
- Security: NOT secure (plain text)
- Use: Public information only (being replaced by HTTPS)
HTTPS (HTTP Secure):
- Purpose: Transfer web pages securely
- Port: 443
- Security: Encrypted with SSL/TLS
- Use: Banking, shopping, logins, any sensitive data
FTP (File Transfer Protocol):
- Purpose: Transfer files between computers
- Port: 21 (command), 20 (data)
- Security: NOT secure (being replaced by SFTP)
- Use: Upload website files, file sharing
SMTP (Simple Mail Transfer Protocol):
- Purpose: SEND emails (not receive)
- Port: 25, 587
- Security: Can be encrypted with TLS
- Receiving: Use POP3 (download) or IMAP (sync)
The Golden Rule:
Different protocols for different purposes! HTTP/HTTPS for web, SMTP for sending email, FTP for files. ALWAYS use secure versions (HTTPS, SFTP, IMAPS) when handling sensitive data!
Practice questions for Protocols
What is a protocol in networking?
Explain the role of TCP/IP in network communication.