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Module 1: Physical Layer & Data Communication

20212m

What layer in the TCP/IP stack is equivalent to the transport layer of the OSI model?

(i) Application
(ii) Host-to-host
(iii) Internet
(iv) Network access

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(ii) Host-to-host

The TCP/IP model's Host-to-Host (Transport) layer maps directly onto the OSI Transport layer — both provide end-to-end, process-to-process delivery via protocols like TCP and UDP. Application maps to OSI's top three layers combined; Internet maps to OSI's Network layer; Network access maps to OSI's Data Link + Physical layers.

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