OSI and TCP/IP models
35 min · Intermediate
A network model splits the work of sending data into layers, where each layer does one job and hands the result to the next. Interviewers use two models: the seven-layer OSI model to explain ideas, and the four-layer TCP/IP model that the internet actually runs on.
Topics in this lesson
- The seven OSI layers
- The TCP/IP model and how it maps to OSI
- Encapsulation: data, segment, packet, frame, bits
- Which devices and protocols work at each layer
- Answering "Explain the OSI model" in an interview
Interview questions this lesson answers
- What is the OSI model?
- What is the difference between the OSI and TCP/IP models?
- What is encapsulation in networking?
- What does the physical layer do?
- What does the data link layer do?
- What does the network layer do?
- What does the transport layer do?
- What do the session and presentation layers do?
- What does the application layer do?
- What is a PDU?
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