CompTIA
220-801 · Question #993
220-801 Question #993: Real Exam Question with Answer & Explanation
The correct answer is A: TCP/20. FTP uses two TCP ports by design: TCP port 21 is the control/command channel (used to establish the session and send commands), and TCP port 20 is the data transfer channel (used in active mode to transfer file data). Both are TCP-based - FTP does not use UDP. TCP/22 is SSH/SFTP,
Question
A customer requires that both of the default FTP ports be allowed on the firewall. Which of the following should the technician enable to allow this communication? (Select TWO).
Options
- ATCP/20
- BUDP/20
- CTCP/21
- DUDP/21
- ETCP/22
- FUDP/22
Explanation
FTP uses two TCP ports by design: TCP port 21 is the control/command channel (used to establish the session and send commands), and TCP port 20 is the data transfer channel (used in active mode to transfer file data). Both are TCP-based - FTP does not use UDP. TCP/22 is SSH/SFTP, which is a different protocol entirely.
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