B. 22
Port 22 is commonly associated with the SSH (Secure Shell) protocol, which provides secure communications over a network. SSH is widely used for secure remote administration of systems and secure file transfers. Therefore, if you want to establish secure communications, port 22 is the relevant one among the options provided.
The other ports mentioned (20, 23, 25) are associated with different protocols:
Port 20 is commonly used for FTP (File Transfer Protocol) data transfer.
Port 23 is associated with Telnet, a less secure protocol for remote access.
Port 25 is used for SMTP (Simple Mail Transfer Protocol) for email communication but is not inherently secure.
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Jambito
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