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Protocol Awareness – MQTT, CoAP, Modbus, DNP3
Protocol Awareness – MQTT, CoAP, Modbus, DNP3 IoT and OT protocols. MQTT and CoAP for smart devices. Modbus and DNP3 for factory equipment. Open, anonymous MQTT lets anyone publish fake readings. Modbus often has no authentication inside the plant network. These protocols trust whoever can reach the
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What this card says
What it is
IoT and OT protocols. MQTT and CoAP for smart devices. Modbus and DNP3 for factory equipment.
The risk
Open, anonymous MQTT lets anyone publish fake readings.
Modbus often has no authentication inside the plant network.
Why it matters for security
These protocols trust whoever can reach them.
So network segregation matters more than a clever IDS signature. Concepts only, no attacks.
| Protocol | Typical use |
|---|---|
| MQTT | IoT pub/sub (sensors → broker → apps); ports often 1883 /… |
| CoAP | Constrained devices, UDP-ish IoT |
| Modbus TCP | Many PLCs; often port 502 |
| DNP3 | Utilities / SCADA-style links |
Learn more in the lesson: 43.3 Protocol Awareness – MQTT, CoAP, Modbus, DNP3