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Module 5: Application Layer & Security

20222m

FTP server

(i) maintains state information
(ii) is stateless
(iii) has single TCP connection for a file transfer
(iv) has UDP connection for file transfer

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Answer: (i) maintains state information

Why: FTP is stateful: the server tracks the control connection, the logged-in user, the current working directory and the transfer mode. It is not stateless (HTTP, by contrast, is), it uses two TCP connections (control port 21 + data port 20) rather than a single one, and file transfer runs over TCP, never UDP.

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