The three open ports 22, 443, and 1521 are commonly associated with which combination of services?

The three open ports 22, 443, and 1521 are commonly associated with which combination of services?

• A. SSH, HTTPS, and Oracle databases
• B. FTP, DNS, and SMTP
• C. Telnet, HTTP, and Oracle databases
• D. HTTPS, SSH, and FTP

Answer: (A)

Port 22 is the standard for SSH, which provides secure remote login and command execution. Port 443 is the HTTPS port, the encrypted form of HTTP used for secure web traffic. Port 1521 is the Oracle database listener port, used for Oracle database connections. Put together, these ports point to SSH, HTTPS, and Oracle databases. The other options would pair these ports with services that use different port numbers (for example, FTP uses 21, DNS uses 53, SMTP uses 25, Telnet uses 23, HTTP uses 80), so they don’t match the given port set.

Port 22 is the standard for SSH, which provides secure remote login and command execution. Port 443 is the HTTPS port, the encrypted form of HTTP used for secure web traffic. Port 1521 is the Oracle database listener port, used for Oracle database connections. Put together, these ports point to SSH, HTTPS, and Oracle databases. The other options would pair these ports with services that use different port numbers (for example, FTP uses 21, DNS uses 53, SMTP uses 25, Telnet uses 23, HTTP uses 80), so they don’t match the given port set.