FTP (File Transfer Protocol) includes built-in USER and PASS commands that require a client to supply a username and (usually) a password before the server allows file access, thereby providing user authentication. Trivial File Transfer Protocol (TFTP) was intentionally designed to be lightweight; it omits any mechanism for authenticating users, so anyone who can reach the service can request permitted files. This fundamental difference means FTP can enforce access control, whereas TFTP cannot, which is why TFTP is typically restricted to trusted, closed networks or device bootstrapping scenarios.
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