This comparison covers TCP/IP Four-Layer Model within TCP/IP Layers for GCSE Computer Science. Revise TCP/IP Layers in 3.5 Fundamentals of Computer Networks for GCSE Computer Science with 16 exam-style questions and 18 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 11 in this topic. Use this comparison to connect the idea to the wider topic before moving on to questions and flashcards.
TCP/IP Four-Layer Model
| Layer | Name | Purpose | Protocols | Data Unit |
|---|---|---|---|---|
| 4 | Application | Network services for applications | HTTP, FTP, SMTP, DNS | Data/Messages |
| 3 | Transport | Reliable delivery, error checking | TCP, UDP | Segments/Datagrams |
| 2 | Internet | Addressing and routing | IP (IPv4/IPv6) | Packets |
| 1 | Link | Physical transmission | Ethernet, WiFi | Frames |
Practice questions for TCP/IP Layers
How many layers does the TCP/IP model have?
Describe what the Internet layer does in the TCP/IP model.