Which two ports does EtherNet/IP use to communicate? (Choose two.)

The correct answer is A. TCP 44818 F. UDP 2222. EtherNet/IP uses TCP 44818 for explicit messaging - connection-oriented requests like device configuration and diagnostics - and UDP 2222 for implicit messaging, which carries real-time cyclic I/O data where speed matters more than guaranteed delivery. UDP 44818 (B) is wrong…

Troubleshoot Industrial Network Protocols

Question

Options

ATCP 44818
BUDP 44818
CTCP 502
DUDP 502
ETCP 2222
FUDP 2222

How the community answered

(23 responses)

A
91% (21)
C
4% (1)
D
4% (1)

Explanation

EtherNet/IP uses TCP 44818 for explicit messaging - connection-oriented requests like device configuration and diagnostics - and UDP 2222 for implicit messaging, which carries real-time cyclic I/O data where speed matters more than guaranteed delivery. UDP 44818 (B) is wrong because that port's connection-oriented explicit messaging requires TCP's reliability guarantees. TCP 502 and UDP 502 (C, D) belong to Modbus TCP, a completely different industrial protocol - a common trap on industrial networking exams. TCP 2222 (E) is wrong because implicit I/O traffic uses UDP, not TCP, since the low-latency, connectionless nature of UDP suits time-sensitive sensor/actuator data.

Memory tip: Pair the protocol to the purpose - "TCP = Talking explicitly (44818)" and "UDP = Urgent I/O (2222)." If you remember Modbus owns 502, the remaining options fall into place.

Topics

#EtherNet/IP#Port numbers#Industrial protocols#Network communication

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