John wants to secure the FTP server access by allowing only authorized users access to it. What should he do?
  1. Allow blind authentication.
  2. Redirect FTP to a different port.
  3. Change the port on which FTP works.
  4. Disable anonymous logins.
Explanation
Answer: D - John should not allow any anonymous FTP access, since this can be exploited by a hacker to gain access to the server.

Key Takeaway: Anonymous FTP allows users to read files from special directories residing on remote hosts. It is useful because it allows all users who do not have a login name or a password to access and copy most files. This type of FTP has a special login name: anonymous. Although easy to implement, this can pose a major security threat since it allows all users to download files from the FTP location.
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