PCN PEP
More study resources
Cheat sheet
Keep the key ideas within reach.
ExploreKey terms
Get comfortable with the vocabulary.
ExploreStudy plan
Give each week a clear focus.
ExploreCommon mistakes
Understand the traps and how to avoid them.
ExploreCase studies
Put your knowledge to work in context.
ExploreExam-day guide
Prepare for the day ahead.
ExploreAbout this exam
The PCN PEP (Process Control Network Professional Engineering Program) is a professional credential aimed at engineers and security practitioners who design, operate, and defend industrial control networks in process industries such as refining, chemicals, power, and utilities. It sits at the intersection of operational technology (OT) engineering and cybersecurity: candidates are expected to understand how a PLC, RTU, DCS, or SCADA system actually moves data, and then reason about how to segment, monitor, and harden that traffic without breaking the process. The exam spans seven domains weighted toward security controls and defense in depth, with substantial coverage of process control fundamentals, industrial protocols, network architecture and segmentation, risk assessment and compliance, monitoring and incident response, and lifecycle management. Expect scenario-driven multiple-choice items rather than trivia: a question may describe a plant with a flat control network and ask which segmentation approach best balances risk reduction against operational continuity. Preparation should combine hands-on familiarity with industrial protocols and firewalls with structured study of standards frameworks such as IEC 62443 and the Purdue reference model. Working through architecture diagrams, reading vendor and standards documentation, and practicing risk-scenario reasoning is more valuable than memorizing port numbers. Candidates should confirm current exam logistics, including any published question count, time limit, fee, passing score, and retake policy, directly with the certifying body, since those details change and are not fixed here.
What you'll study
About PCN PEP preparation
What is the PCN PEP actually testing - IT security or control engineering?
Both, but weighted toward the control side. You need enough IT security depth to reason about firewalls, segmentation, and monitoring, and enough process knowledge to know why a given control would disrupt a plant. Questions often hinge on the trade-off between security and operational continuity rather than on pure protocol trivia.
What is the exam format?
The published format is multiple choice. Question count, time limit, and delivery method are set by the certifying body and can change between windows, so check its official site for the current figures before you schedule.
How hard is it, and how long should I study?
Candidates with real OT or ICS experience typically need focused study on the domains they touch least - often risk assessment, compliance frameworks, and monitoring. Those without plant exposure should budget extra time for architecture and protocol fundamentals. There is no single official study-hour figure; build a plan around your weakest domains.
What should I study first?
Start with process control fundamentals and the Purdue model, because segmentation, monitoring, and risk questions all assume that mental model. Then move to industrial protocols and network architecture. Security controls and defense in depth carry the largest weight, so leave generous time for them rather than treating them as a final review topic.
Where do retake rules and fees come from?
The certifying body publishes retake policy, fees, and any waiting periods on its official site. These are administrative details that change, so confirm them there rather than relying on third-party summaries or older forum posts.
How long is the credential valid, and is there recertification?
Validity periods and recertification requirements are set by the certifying organization and are not fixed in advance here. Check the official program page for the current validity term and any continuing education or renewal requirements before you commit to the exam.
What are the most common failure modes?
Treating the exam as pure IT security and ignoring process constraints; memorizing protocol port numbers without understanding data flows; and skimming risk and compliance frameworks because they feel bureaucratic. Scenario questions reward candidates who can justify a control choice against operational impact, not those who recall isolated facts.
How should I prepare in the final weeks?
Practice reasoning aloud through architecture scenarios: given a flat network, a remote-access requirement, and a legacy protocol, what would you segment, monitor, and document? Review IEC 62443 concepts and zone/conduit thinking. Re-read your weakest domain notes rather than re-reading everything, and confirm exam logistics on the official site.