Which range is used for dynamic/private (ephemeral) ports?

Which range is used for dynamic/private (ephemeral) ports?

• A. 1024-49151
• B. 49152-65535
• C. 0-1023
• D. 65536-131071

Answer: (B)

Dynamic/private (ephemeral) ports are the temporary source ports a client uses when it initiates a connection. They’re drawn from the high end of the port range to avoid conflicting with well-known and registered services. The standard range designated for ephemeral use is 49152 through 65535, which is why this is the correct choice. Remember, port numbers go from 0 to 65535; the 0–1023 block is reserved for well-known ports (system services), 1024–49151 covers registered ports for specific services, and the upper block is reserved for dynamic/private use. Ports beyond 65535 aren’t valid.

Dynamic/private (ephemeral) ports are the temporary source ports a client uses when it initiates a connection. They’re drawn from the high end of the port range to avoid conflicting with well-known and registered services. The standard range designated for ephemeral use is 49152 through 65535, which is why this is the correct choice. Remember, port numbers go from 0 to 65535; the 0–1023 block is reserved for well-known ports (system services), 1024–49151 covers registered ports for specific services, and the upper block is reserved for dynamic/private use. Ports beyond 65535 aren’t valid.