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Questions and Answers
What is the primary concern at the Internet layer of the TCP/IP model?
What is the main function of the transport layer in the TCP/IP model?
What is the term used to describe the layer of the TCP/IP model where Mac addresses and Ethernet switches are used?
What is the primary function of the physical layer of the TCP/IP model?
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What is the term used to describe the layer of the TCP/IP model where DNS, Http, and Smtp operate?
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What is the main reason why there are different versions of the TCP/IP model?
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What was the primary contender for IP addresses when the OSI model was first developed?
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What is the main difference between the OSI model and the TCP IP model?
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What is the name of the layer in the TCP IP model that combines the physical and data link layers of the OSI model?
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What is the name of the layer in the TCP IP model that is similar to the transport layer in the OSI model?
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What is a common variation of the TCP IP model?
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What is the name of the layer in some variants of the 5-layer TCP IP model that is similar to the data link layer in the OSI model?
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What is the main challenge with the TCP IP model?
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What is the name of the layer in the TCP IP model that combines the session, presentation, and application layers of the OSI model?
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Study Notes
OSI Model vs TCP/IP Model
- The OSI model categorizes network functions and devices into 7 layers
- The TCP/IP model groups the top 3 layers of the OSI model (session, presentation, and application) into a single application layer
Key Features of the TCP/IP Model
- Combines physical and data link layers of the OSI model into a single network access layer
- Renames the network layer as the Internet layer
- Transport layer keeps its name
- Application layer groups together session, presentation, and application layers
Variants of the TCP/IP Model
- 4-layer model: combines physical and data link layers into a single network access layer
- 5-layer model: keeps physical and data link layer names from the OSI model
- Alternative names for layers: network interface layer, link layer, network access layer
Key Concepts
- Physical layer: concerns getting bits on the wire with network cabling or fiber optic cabling
- Internet layer: concerns IP addressing, where routers live
- Transport layer: concerns TCP and UDP protocols
- Application layer: concerns formatting data, setting up/maintaining/tearing down sessions, and applications themselves (e.g. DNS, HTTP, SMTP)
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