TCP port 443 is assigned to which protocol?

TCP port 443 is assigned to which protocol?

• A. HTTPS (Hypertext Transfer Protocol Secure)
• B. Hypertext Transfer Protocol (HTTP)
• C. File Transfer Protocol (FTP)
• D. Secure Shell (SSH)

Answer: (A)

Port 443 is the standard port used for secure web traffic. When a client connects to a URL with https://, the connection uses TLS or SSL to encrypt HTTP messages, so the protocol spoken is HTTPS, typically over TCP port 443. This encryption distinguishes HTTPS from plain HTTP, which uses port 80 by default. Other common ports: FTP usually uses 21, and SSH typically uses 22. While services can be configured to use different ports, 443 is the conventional default for HTTPS.

Port 443 is the standard port used for secure web traffic. When a client connects to a URL with https://, the connection uses TLS or SSL to encrypt HTTP messages, so the protocol spoken is HTTPS, typically over TCP port 443. This encryption distinguishes HTTPS from plain HTTP, which uses port 80 by default. Other common ports: FTP usually uses 21, and SSH typically uses 22. While services can be configured to use different ports, 443 is the conventional default for HTTPS.