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When studying for the CCNA exam, the first thing that you should do is to memorize a list of port numbers and protocols that run on those ports. If you’re an experienced networker, you would know these protocols – SMTP, FTP, DHCP, and DNS. But maybe you have not heard of one protocol which is vital for working with Cisco switches and routers, and in CCNA exam studies. That’s TFTP – Trivial File Transfer Protocol.
TFTP is a non-secure relative of FTP. There are no authentication scheme and no passwords. It is used in Cisco to perform IOS upgrades and save configs to TFTP Server. Cisco routers can serve as TFTP themselves, or you can use a workstation.