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Exam NSEI_OTS_AR-7.6 Topic 1 Question 4 Discussion

Actual exam question for Fortinet's NSEI_OTS_AR-7.6 exam
Question #: 4
Topic #: 1
Which industrial protocol does not support VLANs? (Choose one answer)

Suggested Answer: C Vote an answer

The correct answer is C. EtherCAT .
The study guide states that for industrial Ethernet protocols, "such as Ethernet/IP and Modbus/TCP, you can use VLANs to segment your physical LAN into multiple logical LANs." This directly confirms that Ethernet/IP and Modbus/TCP support VLAN-based segmentation in the OT context.
By contrast, the guide explains that "EtherCAT skips layers 3 to 6 to deliver real-time communication" and describes it as an "Open-Software Modified-Ethernet" approach. Because it does not operate like the standard Ethernet/IP model used for normal VLAN-based segmentation, EtherCAT is the protocol identified here as not supporting VLANs in the way Ethernet/IP and Modbus/TCP do.
So, based on the study guide comparison, the verified answer is EtherCAT .

by Tim at Sep 12, 2026, 12:11 PM

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