200-301 · Question #949
Which is a fact related to FTP?
The correct answer is D. It uses two separate connections for control and data traffic. FTP is unique among common application-layer protocols as it establishes two distinct connections between client and server: one for control commands and another for the actual data transfer.
Question
Which is a fact related to FTP?
Options
- AIt uses block numbers to identify and mitigate data-transfer errors
- BIt always operates without user authentication
- CIt relies on the well-known UDP port 69.
- DIt uses two separate connections for control and data traffic
How the community answered
(44 responses)- A5% (2)
- B2% (1)
- C2% (1)
- D91% (40)
Why each option
FTP is unique among common application-layer protocols as it establishes two distinct connections between client and server: one for control commands and another for the actual data transfer.
FTP does not use block numbers for error identification and mitigation; that is more characteristic of TFTP (Trivial File Transfer Protocol) or lower-layer protocols.
FTP typically requires user authentication (username and password), although anonymous FTP is a specific configuration allowing access without a unique user account.
FTP uses TCP, not UDP, and the well-known port 69 is associated with TFTP (Trivial File Transfer Protocol), not FTP. FTP uses TCP port 21 for control.
FTP (File Transfer Protocol) uniquely uses two separate TCP connections: one on port 21 for control commands (like login, directory changes, file deletion) and another for data transfer (typically port 20 for active mode or a dynamic port for passive mode). This separation allows for simultaneous control and data flow.
Concept tested: FTP connection architecture
Source: https://www.rfc-editor.org/rfc/rfc959
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