CyberCertPrepOT Security FundamentalsOT Fundamentals: Network Architecture & ProtocolsEASYFree question
A utility engineer sees traffic to port 20000 between a control center front end and a substation RTU. Which protocol is in use?
- A.ICCP linking two remote utility control centers
- B.IEC 61850 MMS linking a client with an IED
- C.DNP3 linking a master with an outstation
- D.Modbus TCP linking a client with a gateway
Why C is correct
TCP and UDP port 20000 is the standard DNP3 port, used between a master and its outstations. MMS and ICCP use TCP 102, and Modbus TCP uses 502.
Know someone studying for OT Security Fundamentals? Send them this one.