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Protocols, FTP, TFTP, SFTP, SMTP, POP3 an IMAP This lesson focuses on ports that use the TCP and UDP communications protocol. This lesson discusses the following protocols: File Transfer Protocol (FTP): This is a TCP protocol and there is no encoding or overhead, it is insecure. Trivial File Transfer Protocol (TFTP): This is a UDP protocol which allows us to send to multiple clients at once. Secure File Transfer Protocol (SFTP): This is a TCP protocol that encrypts with Secure Shell (SSH) and is more secure than FTP. This lesson also discusses the following mail protocols:
Simple Mail Transfer Protocol (SMTP): Uses TCP; e mail between servers and from Outlook.
Post Office Protocol 3 (POP3): Uses TCP; e mail comes from client download from server. Typically copies and deletes.
IMAP: uses TCP, downloads from server to client and keeps a copy of the message on the server, it has more configuration ability than a POP3.