GSEC Question #199: Real Exam Question with Answer & Explanation

The correct answer is A. Well known port. This question tests knowledge of the IANA port number categories and where specific well-known protocol ports fall.

Question

Which port category does the port 110 fall into?

Options

AWell known port
BDynamic port
CPrivate port
DApplication port

Explanation

This question tests knowledge of the IANA port number categories and where specific well-known protocol ports fall.

Common mistakes.

B. Dynamic ports, also called ephemeral ports, occupy the range 49152-65535 and are assigned temporarily by the OS for client-side connections, not protocol services like POP3.
C. Private ports share the 49152-65535 range with dynamic ports and are used for custom or internal applications, not for IANA-registered protocols such as POP3.
D. 'Application port' is not a recognized IANA port category; IANA defines three categories: well-known (0-1023), registered (1024-49151), and dynamic/private (49152-65535).

Concept tested. IANA port number categories and POP3 port assignment

Reference. https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

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