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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

Explanation

A port number identifies a particular process or service on a host at the Transport layer.

For example, a host may have one IP address but many active processes. The destination IP address identifies the host, while the destination port identifies the intended application/process.

  • Physical address: MAC address; identifies a network interface on a local network.
  • Logical address: IP address; identifies a host/interface at the Network layer.
  • Port address: identifies a process/service at the Transport layer.

Final answer: (ii) Port address.

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