While adjusting the firewall to allow FTP traffic, you open TCP port 21. FTP traffic is still being blocked by the firewall. What should you do next?
A. Open TCP port 20
B. Open UDP port 21
C. Open TCP port 22
D. Close TCP port 21
The correct answer is A.
FTP in active mode requires both TCP ports 20 and 21. If either port is blocked, FTP cannot function normally.
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