GRID Exam Prep: GIAC Response and Industrial Defense #1

Most candidates lose GRID points in one of two places. They know industrial systems well but answer like an enterprise IT analyst, reaching for isolation and reimaging when the process is still running. Or they know security theory but have never had to weigh a containment decision against a turbine that cannot be stopped. These five practice tests are designed to surface both problems while you still have time to fix them. What is inside 430 original single-best-answer questions across five timed practice tests. No multi-select, no fill-in-the-blank, because that is not how GIAC writes this exam. Every question carries a written explanation covering why the correct answer is correct, why the most tempting wrong answer fails, and which objective area the question belongs to, so you know exactly what to go back and read. Coverage Questions are distributed across the seven official GRID objectives, grouped the way GIAC groups them on its own certification page: Active defense in an ICS environment, including what Stuxnet, Industroyer, TRITON and Industroyer2 taught defenders Detection in an ICS environment Visibility and asset awareness, including passive discovery where scanning is prohibited Monitoring, with real ICS protocol behavior: Modbus function codes, DNP3, OPC UA, S7comm, IEC 104, EtherNet/IP and CIP Incident response and forensics under industrial constraints, including PLC and engineering workstation evidence Threat hunting and analysis, including malware analysis applied to OT tooling Threat intelligence and how to operationalize it rather than file it Roughly a third of the questions are direct knowledge, close to half are applied scenarios where you decide the next action, and the rest ask you to interpret a log excerpt, a protocol snippet or an asset inventory and say what it shows. How to use it Take test one cold. Score it, read every explanation including on questions you answered correctly, and write down the objectives where you guessed. Study those, then take the next test. By test five you should be scoring consistently rather than scoring well once. Volume 2 of this series adds five more tests and 430 more questions at the same scope and difficulty, for a second full pass closer to exam day. Please note: this is an independently produced preparation course. It is not affiliated with, authorized by, endorsed by or sponsored by GIAC or the SANS Institute. All questions are original study material, not actual exam items. Confirm the current number of questions, time limit, passing score and permitted materials for your specific attempt in your own GIAC account before exam day. Who this course is for: ICS and OT security engineers preparing to sit the GIAC Response and Industrial Defense exam. ICS incident response team leads and members who need evidence of readiness before booking the attempt. SOC analysts and team leads moving from enterprise IT monitoring into industrial environments. SANS ICS515 students who have finished the course and want question practice mapped to the objectives. Control system engineers and plant technical staff who have picked up security responsibility on site. Penetration testers and red teamers entering ICS work who want the defender's view of their own tradecraft. Consultants and auditors assessing industrial security programs who need fluency in ICS active defense language. Anyone retaking GRID who wants a structured way to locate what went wrong the first time.