UDP port 67 is used by?

UDP port 67 is used by?

• A. DNS
• B. DHCP - Server
• C. NTP
• D. TFTP

Answer: (B)

UDP port 67 is used by the DHCP server to listen for and respond to DHCP requests. In a DHCP exchange, a client broadcasts a request from port 68 to the server’s port 67, and the server replies from 67 to the client’s 68 with offerings and acknowledgments. This port pairing lets the server dynamically assign IP configuration to clients on the network. Other services use different ports—DNS uses UDP 53, NTP uses UDP 123, TFTP uses UDP 69—so they don’t involve port 67.

UDP port 67 is used by the DHCP server to listen for and respond to DHCP requests. In a DHCP exchange, a client broadcasts a request from port 68 to the server’s port 67, and the server replies from 67 to the client’s 68 with offerings and acknowledgments. This port pairing lets the server dynamically assign IP configuration to clients on the network. Other services use different ports—DNS uses UDP 53, NTP uses UDP 123, TFTP uses UDP 69—so they don’t involve port 67.