Multiple choice

During an FTP session, the control connection is opened

  1. exactly once

  2. exactly twice

  3. as many times as necessary

  4. none of the above
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A Correct answer
Explanation

In FTP, the control connection is established exactly once at the beginning of the session and remains open throughout. This connection is used for sending commands (like LIST, RETR) and receiving responses. The data connection, by contrast, is opened and closed for each file transfer.

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