This exam tips covers Exam Tips - Network Protocols within Protocols for GCSE Computer Science. Revise Protocols in Networks for GCSE Computer Science with 15 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 9 of 10 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 9 of 10
Practice
15 questions
Recall
18 flashcards
Exam Tips - Network Protocols
Most common exam questions:
- "What is HTTP?" → Protocol for transferring web pages over the Internet
- "Difference HTTP vs HTTPS?" → HTTPS is encrypted/secure (SSL/TLS). HTTP is plain text/insecure.
- "Why use HTTPS for banking?" → Encrypts data (credit cards, passwords) so can't be read if intercepted
- "What is FTP?" → Protocol for transferring files between computers
- "What is SMTP?" → Protocol for SENDING emails (not receiving)
- "SMTP vs POP3/IMAP?" → SMTP sends emails. POP3/IMAP receive emails.
- "Default HTTP port?" → Port 80
- "Default HTTPS port?" → Port 443
Key facts to memorize:
| Protocol | Purpose | Secure? |
|---|---|---|
| HTTP | Web pages | NO |
| HTTPS | Web pages (encrypted) | YES (SSL/TLS) |
| FTP | File transfers | NO (use SFTP) |
| SMTP | Send emails | Can encrypt (TLS) |
Common mistakes to avoid:
- Confusing SMTP (sending) with POP3/IMAP (receiving) - they're different!
- Saying "HTTP is for websites, HTTPS is for emails" - NO! Both are for web, HTTPS just adds encryption
- Forgetting WHY HTTPS is important (encryption prevents interception)
- Not knowing port numbers (HTTP=80, HTTPS=443)
- Thinking FTP is still widely used - it's being replaced by SFTP/HTTPS
Perfect exam answer structure:
"Explain why HTTPS should be used for online banking" (3 marks):
HTTPS encrypts data transmitted between browser and server (1 mark).
Protects sensitive information like credit card numbers and passwords (1 mark).
Even if intercepted, data cannot be read without decryption key (1 mark).