Which protocol uses port 443?

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Multiple Choice

Which protocol uses port 443?

Explanation:
Port 443 is the default port for secure web traffic. The protocol that runs over that port is HTTPS, which is HTTP secured with TLS/SSL. This pairing is what browsers use to securely fetch pages and transmit data. The other options don’t typically use port 443: FTP uses port 21 (and 20 for data, with various data ports in passive mode), SMTP uses ports like 25, 587, or 465, and TCP is the underlying transport protocol that can carry many different application protocols but doesn’t designate a single protocol’s port. So, HTTPS is the protocol associated with port 443.

Port 443 is the default port for secure web traffic. The protocol that runs over that port is HTTPS, which is HTTP secured with TLS/SSL. This pairing is what browsers use to securely fetch pages and transmit data. The other options don’t typically use port 443: FTP uses port 21 (and 20 for data, with various data ports in passive mode), SMTP uses ports like 25, 587, or 465, and TCP is the underlying transport protocol that can carry many different application protocols but doesn’t designate a single protocol’s port. So, HTTPS is the protocol associated with port 443.

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