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Module 4: Transport Layer & Congestion Control

20222m

The address which is used to identify a process on a host is

(i) physical address
(ii) port address
(iii) logical address
(iv) specific address

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Answer: (ii) port address

Why: A port number (port address) identifies a specific process/application on a host, enabling transport-layer process-to-process (end-to-end) delivery — e.g. port 80 → web server. The physical address identifies a NIC, the logical (IP) address identifies the host itself, and "specific address" is not a recognised addressing category.

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