As an OT administrator, it is important to understand how industrial protocols work in an OT network. Which communication method is used by the Modbus protocol?

Question

Options

• AIt uses OSI Layer 2 and the primary device sends data based on request from secondary device.
• BIt uses OSI Layer 2 and both the primary/secondary devices always send data during the
• CIt uses OSI Layer 2 and both the primary/secondary devices send data based on a matching
• DIt uses OSI Layer 2 and the secondary device sends data based on request from primary device.

• A
  6% (1)
• B
  11% (2)
• C
  6% (1)
• D
  78% (14)

Explanation

Modbus is master/slave: the master (primary) polls; a slave (secondary) replies only when requested. That fits "secondary sends data based on request from primary device."

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