SSCP · Question #1154
Which range defines "well known ports?
The correct answer is B. 0-1023. Well-known ports are those ranging from 0 to 1023, assigned by IANA for common network services.
Question
Which range defines "well known ports?
Options
- A0-1024
- B0-1023
- C1-1024
- D1024-49151
How the community answered
(18 responses)- B89% (16)
- C6% (1)
- D6% (1)
Why each option
Well-known ports are those ranging from 0 to 1023, assigned by IANA for common network services.
This range includes 1024, which is the first registered port, not a well-known port.
The Internet Assigned Numbers Authority (IANA) divides the 65536 available ports into three ranges: well-known ports (0-1023), registered ports (1024-49151), and dynamic/private ports (49152-65535). The well-known ports are reserved for system processes and commonly used services like HTTP (80), FTP (20, 21), and SSH (22).
This range excludes port 0, which is part of the well-known port range and can be used by services, though it's typically reserved.
This range defines the "registered ports" or "user ports," which are distinct from well-known ports.
Concept tested: TCP/UDP port ranges
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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