CyberCertPrepOT Security FundamentalsOT Fundamentals: Network Architecture & ProtocolsEASYFree question
In a Modbus architecture a historian polls a PLC through a gateway on a plant network. Which role starts each request?
- A.The gateway known as the broker that assigns slots
- B.The slave with the highest address acting as arbiter
- C.The client known as the master that polls
- D.The outstation known as the unsolicited reporter
Why C is correct
Modbus is request and response. The master (client) initiates and the slave (server) answers. Unsolicited reporting belongs to DNP3, gateways only translate, and no slave arbitrates traffic.
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