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Module 4: Transport Layer & Congestion Control

20222m

Transport layer protocol deals with

(i) application-to-application communication
(ii) node-to-node communication
(iii) the process-to-process communication
(iv) Both (i) and (ii)

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Answer: (iii) the process-to-process communication

Why: The transport layer uses port numbers to deliver data from a sending process on one host to the correct process on the destination host (it also performs multiplexing/demultiplexing). Node-to-node communication is the data link layer's job, and "application-to-application" is not the standard term — the application layer connects user-facing software, while the transport layer beneath it handles processes.

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