GSEC · Question #199
Which port category does the port 110 fall into?
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
How the community answered
(20 responses)- A75% (15)
- B15% (3)
- C5% (1)
- D5% (1)
Why each option
This question tests knowledge of the IANA port number categories and where specific well-known protocol ports fall.
Port 110 is assigned to POP3 (Post Office Protocol version 3) and falls within the well-known ports range of 0-1023, as defined by IANA. Well-known ports are reserved for standardized, globally recognized services and protocols, and assignments in this range require IANA authorization.
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.
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.
'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
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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