What range of ports are classified as registered ports according to the IANA?

What range of ports are classified as registered ports according to the IANA?

• A. 1 through 1023
• B. 1024 through 49151
• C. 49152 through 65535
• D. 0 through 255

Answer: (B)

Registered ports are defined by the Internet Assigned Numbers Authority (IANA) as the range from 1024 to 49151. These ports are not as widely known or used as the well-known ports (which range from 1 to 1023), but they are still assigned to specific services or applications by IANA for use by ordinary user processes or programs. This classification allows for the coordination and standardization of certain applications and services that may require specific port numbers, thus helping maintain orderly communication across networks. The other ranges reflect different categories of ports: the range from 1 to 1023 includes well-known ports used by system or privileged services such as HTTP or FTP. The range from 49152 to 65535 is designated for dynamic or private ports, which are typically used for ephemeral connections and are not assigned by IANA. The range from 0 to 255 does not align with any official categorization of port numbers, as ports are generally categorized starting from 1. Therefore, choice B is correctly identified as the range for registered ports.

Registered ports are defined by the Internet Assigned Numbers Authority (IANA) as the range from 1024 to 49151. These ports are not as widely known or used as the well-known ports (which range from 1 to 1023), but they are still assigned to specific services or applications by IANA for use by ordinary user processes or programs. This classification allows for the coordination and standardization of certain applications and services that may require specific port numbers, thus helping maintain orderly communication across networks.

The other ranges reflect different categories of ports: the range from 1 to 1023 includes well-known ports used by system or privileged services such as HTTP or FTP. The range from 49152 to 65535 is designated for dynamic or private ports, which are typically used for ephemeral connections and are not assigned by IANA. The range from 0 to 255 does not align with any official categorization of port numbers, as ports are generally categorized starting from 1. Therefore, choice B is correctly identified as the range for registered ports.