What is the port range from 0 to 1023 and is assigned by IANA to widely used and well-known utilities and applications, such as SSH, Telnet, FTP, and HTTP?

• A. Dynamic ports
• B. Private ports
• C. Well-known ports
• D. Registered ports

Answer: (C)

The question tests how port numbers are organized and who assigns them. The range from 0 to 1023 is reserved by IANA for well-known services, meaning these ports are standardized for common protocols and widely recognized across systems. That’s why SSH uses port 22, Telnet uses 23, FTP uses 21, and HTTP uses 80—the services are designed to run on these well-known ports so clients and servers can reliably locate them. Other ranges exist for different purposes: registered ports (1024–49151) are assigned to specific applications, and dynamic/private ports (49152–65535) are used for temporary, client-side connections. So the best label for the 0–1023 range tied to universal services is well-known ports.