What is TFTP (Trivial File Transfer Protocol) and how does it differ from FTP in terms of port, transport, and authentication?

• A.TFTP uses UDP port 69 for discovery but switches to TCP 69 for actual file transfer.
• B.TFTP uses TCP port 69 with basic password authentication; FTP uses stronger AES encryption.
• C.TFTP uses UDP port 69. Unlike FTP, TFTP has no authentication (no username/password), no directory listing capability, and uses UDP for simple block-by-block file transfer (512-byte blocks by default, acknowledged one at a time). TFTP is used for bootstrapping diskless devices, PXE network booting, and uploading/downloading router/switch OS images and configurations.
• D.TFTP is identical to FTP except that it uses port 69 instead of ports 20 and 21.