ICS SCADA & Industrial Protocol Security 2

Question 1

What is a Remote Terminal Unit (RTU) in a SCADA architecture?

Accepted Answer

A field device that interfaces with sensors and actuators and communicates data to the SCADA master station

Answer

An RTU is a microprocessor-based field device that collects data from local sensors and actuators and relays it to the SCADA master station, and can execute commands received from the master.

Question 2

In OT security, which property is typically prioritized above the traditional IT security triad?

Accepted Answer

Availability

Answer

In OT/ICS environments, availability is the top priority because downtime can cause safety incidents, environmental harm, or major economic loss, unlike most IT environments where confidentiality often takes precedence.

Question 3

What is 'air gapping' as a security measure in ICS environments?

Accepted Answer

Physically isolating a network so it has no direct connection to external or corporate networks

Answer

Air gapping means physically separating an ICS network from all other networks, including the internet and corporate IT networks, eliminating the electronic attack path.

Question 4

The Purdue Model (also known as PERA) is used in ICS security to:

Accepted Answer

Establish a hierarchical reference model for organizing ICS network segments into levels

Answer

The Purdue Model organizes ICS infrastructure into five hierarchical levels — from field devices at Level 0 up to enterprise systems at Level 4 — providing a framework for applying security controls at each layer.

Question 5

Which cyberweapon specifically targeted Siemens S7-series PLCs and caused physical damage to uranium enrichment centrifuges?

Accepted Answer

Stuxnet

Answer

Stuxnet was a sophisticated worm, discovered in 2010, that specifically targeted Siemens Step 7 software and S7-315/S7-417 PLCs to manipulate centrifuge speeds at Iran's Natanz facility while reporting normal operation to operators.

(ICS) Industrial Control Systems Security Certification Practice Test

(ICS) Industrial Control Systems Security Certification Practice Test

ICS SCADA & Industrial Protocol Security 2