Cambridge AS & A Level Computer Science
14.1Protocols
Protocols in Cambridge AS & A Level Computer Science: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic40 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 14.1.1Explain why a protocol is essential and how a protocol suite is viewed as a stack of layers.
- 14.1.2Describe the four TCP/IP layers (Application, Transport, Internet, Link) and what happens to a message sent from one host to another.
- 14.1.3Describe the purposes of HTTP, FTP, POP3, IMAP, SMTP and BitTorrent.
Lessons
- Full access
Application-layer protocols: HTTP, FTP, SMTP, POP3, IMAP and BitTorrent
50 min
- Full access
The OSI model and the TCP/IP protocol stack
55 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
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