A pipeline operator uses an RTU to monitor and control remote valve sites. The RTU communicates with a central SCADA system over a leased line. The operator wants to add a new pressure sensor at a remote site. Which of the following is the MOST appropriate way to integrate the new sensor?

Connect the sensor to the RTU's analog input module and configure the RTU to poll it.

Connect the sensor directly to the SCADA master via the leased line.

Install a separate radio transmitter for the sensor and have it send data directly to the SCADA master.

Replace the RTU with a PLC that has more input channels.

A chemical plant has a PLC controlling a reactor temperature loop. The PLC reads a thermocouple (Level 0) and sends a 4-20 mA signal to a steam control valve (Level 0). An attacker has gained access to the PLC's engineering workstation and can modify the PLC program. The attacker wants to cause a dangerous over-temperature condition while making it difficult for operators to notice. Which of the following modifications would be most effective and stealthy?

Modify the control valve output so that the valve opens fully when the PLC commands a small opening, and keep the setpoint unchanged.

Disable the high-temperature alarm in the PLC and leave the control logic unchanged.

Change the thermocouple input scaling so that the PLC reads a lower temperature than actual, and increase the setpoint to a value that is still within the operator's acceptable range.

Replace the thermocouple with a lower-range unit and recalibrate the PLC input to match the new range.

GIAC Global Industrial Cyber Security Professional

Domain 1Objective 3

PERA Level 0 & 1 Technology Overview and Compromise GICSP Practice Questions (Page 7)

Part of the ICS Fundamentals and Architecture domain, which makes up ~40% of our current practice bank. GIAC (SANS) does not publish an official question count, but from its 180-minute exam (~70–120 total, ~28–48 in this domain), expect 7–12 from this objective — we provide 32 practice questions to prepare you well beyond it. (estimate)

32questions here

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5concepts

Questions 31–32

31application · medium
A pipeline operator uses an RTU to monitor and control remote valve sites. The RTU communicates with a central SCADA system over a leased line. The operator wants to add a new pressure sensor at a remote site. Which of the following is the MOST appropriate way to integrate the new sensor?
Select an answer first
32expert · hard
A chemical plant has a PLC controlling a reactor temperature loop. The PLC reads a thermocouple (Level 0) and sends a 4-20 mA signal to a steam control valve (Level 0). An attacker has gained access to the PLC's engineering workstation and can modify the PLC program. The attacker wants to cause a dangerous over-temperature condition while making it difficult for operators to notice. Which of the following modifications would be most effective and stealthy?
Select an answer first

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PERA Level 0 & 1 Technology Overview and Compromise GICSP Practice Questions (Page 7)

Questions 31–32

A pipeline operator uses an RTU to monitor and control remote valve sites. The RTU communicates with a central SCADA system over a leased line. The operator wants to add a new pressure sensor at a remote site. Which of the following is the MOST appropriate way to integrate the new sensor?

Keep studying — ICS Fundamentals and Architecture