Computer Networks: Layered models: OSI and TCP/IP — The Seven Layers of the OSI Model
What each of the OSI model's seven layers does, why networks are built in layers, and how data is wrapped on its way down.
Try 3 questions
1. What is the main engineering benefit of splitting networking into layers?
- A layer can change without redesigning the others
- Data needs fewer bytes to travel
- Each layer runs on its own hardware
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Answer: A layer can change without redesigning the others
Each layer only relies on the service of the one below, so you can swap copper for Wi-Fi, say, without rewriting web browsers.
2. Which organization published the OSI reference model in the 1980s?
- The International Organization for Standardization
- A consortium of US universities
- The United Nations telecom agency alone
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Answer: The International Organization for Standardization
OSI stands for Open Systems Interconnection, a model published by ISO (the International Organization for Standardization) in 1984.
3. Which correctly lists the OSI layers from the bottom up?
- Physical, network, data link, session, transport, application, presentation
- Physical, data link, transport, network, presentation, session, application
- Physical, data link, network, transport, session, presentation, application
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Answer: Physical, data link, network, transport, session, presentation, application
From layer 1 to 7: physical, data link, network, transport, session, presentation, application.
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