Which port range is from 1024 to 49151 and can be used temporarily by processes for nonstandard assignments to increase security?

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

Answer: (D)

Ports are grouped to define how services are identified and accessed. The 1024–49151 range is the registered ports, which organizations can register with IANA and use for their own applications or temporary assignments. This lets a process pick a nonstandard port within that range, reducing reliance on the well-known ports and making automated scans against standard ports less predictable. It provides flexibility for temporary use without stepping into the well-known port space. The other ranges have different roles: well-known ports (0–1023) are reserved for standard services, and dynamic/ephemeral ports (49152–65535) are typically assigned temporarily for outbound connections. So, the port range described is the registered ports.