Several legacy switches need a firmware upgrade, but their boot loaders only support a very lightweight, non-secure file-transfer mechanism. The upgrade must occur over the local network with as little overhead and memory footprint as possible. Which protocol is the BEST choice for transferring the firmware to these devices?
Trivial File Transfer Protocol (TFTP) operates over UDP port 69 and has almost no authentication, encryption, or directory-listing capabilities. Because of its tiny code footprint, it is widely embedded in device ROMs for tasks such as firmware uploads and network booting. FTP could also transfer the file but requires a larger client and server implementation, while SFTP and SCP add encryption and session overhead that these devices cannot support.
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What is the difference between TFTP and FTP?
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Why does TFTP operate over UDP instead of TCP?
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Why doesn’t TFTP support authentication or encryption?