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If 5 files are transferred from server A to client B in the same session. The number of TCP connections between A and B is _______

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If 5 files are transferred from server A to client B in the same session. The number of TCP connections between A and B is _______

(a) 5

(b) 10

(c) 2

(d) 6

This question was posed to me in examination.

I'm obligated to ask this question of FTP in chapter Application Layer of Computer Network

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Correct answer is (d) 6

The explanation is: The client would first initiate the TCP control connection through port 21. Then for every file transfer, a separate connection would be made through port 20. Now, since we have five files to be transferred, 1 control connection + 5 data connections = 6 total TCP connections.

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