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Module 1: Physical Layer & Data Communication

20156m

Compare between TCP/IP and OSI models.

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Worked SolutionAI Assisted
Aspect TCP/IP Model OSI Model
Layers 4 layers 7 layers
Origin Built from real, existing protocols (TCP, IP) Built as a theoretical standard before matching protocols existed
Session/Presentation layers Not separate — merged into Application layer Exist as distinct layers
Practical use Actually used to run the internet Mainly used as a teaching/reference framework
Layer boundaries Looser, layers sometimes overlap in function Strict, well-defined boundaries between layers 
  OSI (7 layers)              TCP/IP (4 layers)
  ---------------             ------------------
  Application     \
  Presentation      >---------  Application
  Session          /
  Transport        ----------  Transport
  Network          ----------  Internet
  Data Link         \
  Physical            >-------  Network Access

In short, TCP/IP is a condensed, practically-driven model, while OSI is a more granular, standards-first model that's mostly used today as a conceptual reference for discussing network layers.

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