L06
FTP, SFTP and FTPS without the confusion
Cram this first — memory hook
Warehouse 21 takes orders; bay 20 sends active deliveries. Door 22 has two secure keys. SSH File Transfer Protocol rides Secure Shell ; FTP over TLS wraps File Transfer Protocol .
Exam trap
Allowing Transmission Control Protocol 21 alone can permit login while preventing file transfers. Passive does not universally use 20 for data.
The slide facts
The active/passive diagram separates control and data connections. The secure-file slide names on 22 and also lists explicit and implicit over Transport Layer Security .
If you have time — extra
File Transfer Protocol () uses a control conversation on Transmission Control Protocol () 21 to issue commands and a separate data connection for file contents. In traditional active , the server initiates the data connection, conventionally from source 20, to the client-selected endpoint. In passive , the client connects to a server-advertised data port. File Transfer Protocol () is a separate file-transfer protocol over Secure Shell (), commonly 22. The deck calls it Secure File Transfer Protocol; retain that wording as a course alias while teaching File Transfer Protocol as the precise common expansion. over () instead protects with Transport Layer Security (). Explicit commonly starts on 21 and upgrades security; implicit conventionally starts with on 990. Both remain -style control/data arrangements. The heading in the deck must not make learners merge into .
Walkthrough
Identify which protocol the question names. For ordinary , distinguish control from data and active from passive. For , choose /22. For , choose protected by and check its mode.