QusPort Number 21 is used for Qus पोर्ट नंबर 21 का उपयोग किसके लिए किया जाता है?

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A. HTTP
B. HTTPS
C. FTP
D. SMTP

Solution

C. FTP

Explanation

Port numbers 21 and 20 are used for FTP. Port 21 is used to establish the connection between the 2 computers (or hosts) and port 20 to transfer data (via the Data channel).