CompTIA
PT0-003 · Question #146
Which of the following OT protocols sends information in cleartext?
The correct answer is C. Modbus. Modbus, particularly the older versions (Modbus RTU and Modbus TCP), does not have built-in security features and transmits data in cleartext. This makes it susceptible to interception and attacks such as eavesdropping and tampering.
Submitted by thandi_sa· Mar 6, 2026Vulnerability discovery and analysis
Question
Which of the following OT protocols sends information in cleartext?
Options
- ATTEthernet
- BDNP3
- CModbus
- DPROFINET
How the community answered
(25 responses)- A4% (1)
- B4% (1)
- C88% (22)
- D4% (1)
Explanation
Modbus, particularly the older versions (Modbus RTU and Modbus TCP), does not have built-in security features and transmits data in cleartext. This makes it susceptible to interception and attacks such as eavesdropping and tampering.
Topics
#OT protocols#Modbus#Cleartext communication#ICS security
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