SK0-004 · Question #424
Which of the following ports should be open on a server that provides IP addressing for clients?
The correct answer is D. UDP 67. DHCP, which provides IP addressing to clients, operates on UDP port 67 for the server-side listener.
Question
Which of the following ports should be open on a server that provides IP addressing for clients?
Options
- ATCP 22
- BTCP 25
- CUDP 53
- DUDP 67
How the community answered
(56 responses)- A2% (1)
- B7% (4)
- C4% (2)
- D88% (49)
Why each option
DHCP, which provides IP addressing to clients, operates on UDP port 67 for the server-side listener.
TCP 22 is used by SSH (Secure Shell) for encrypted remote administration, not IP address assignment.
TCP 25 is used by SMTP (Simple Mail Transfer Protocol) for sending email between servers.
UDP 53 is used by DNS (Domain Name System) for hostname-to-IP resolution, not for IP address assignment.
The Dynamic Host Configuration Protocol (DHCP) uses UDP port 67 for the server and UDP port 68 for the client. Because DHCP discovery occurs before a client has an IP address, it uses UDP broadcasts rather than TCP, making UDP 67 the correct port for a server providing IP addressing services.
Concept tested: DHCP server port assignment UDP 67
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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