PECB · ISMS auditing

ISO 27001 Lead Auditor exam preparation

Practice for the PECB ISO/IEC 27001 Lead Auditor exam with adaptive questions, full-length mock exams, and a readiness score that tells you when you're actually ready to pass.

Before you register: There is no prerequisite to sit the ISO/IEC 27001 Lead Auditor exam — but passing it is not the same as being certified.

One exam feeds four PECB credentials, separated by experience rather than by a different paper. Provisional Auditor requires no experience; Auditor requires two years of work experience (one in information security management) and 200 audit hours; Lead Auditor requires five years (two in information security management) and 300 hours; Senior Lead Auditor requires ten years (seven in information security management) and 1,000 hours. All four also require signing the PECB Code of Ethics. Confirm the current requirements with PECB before deciding which credential you are working toward.

ISO 27001 Lead Auditor exam at a glance

Issuer

PECB

Questions

80 multiple-choice questions

Scoring

Percentage score

Pass mark

70% to pass

Format

Open-book, standalone and scenario-based questions

ISO 27001 Lead Auditor exam domains

The ISO 27001 Lead Auditor exam covers 7 domains, with the approximate weighting shown below:

Fundamental principles and concepts of an information security management system (ISMS)16.25%
ISMS and ISO/IEC 27001 requirements10%
Fundamental audit concepts and principles17.5%
Preparing an ISO/IEC 27001 audit15%
Conducting an ISO/IEC 27001 audit22.5%
Closing an ISO/IEC 27001 audit8.75%
Managing an ISO/IEC 27001 audit program10%

What each ISO 27001 Lead Auditor domain covers

Fundamental principles and concepts of an ISMS. The vocabulary an auditor is expected to share with the auditee: confidentiality, integrity and availability, risk and control language, and how a management system is meant to function as a system rather than as a collection of controls.

ISMS and ISO/IEC 27001 requirements. What the standard requires, clause by clause, plus the role of the Statement of Applicability and how Annex A controls relate to the risk treatment plan. These are the reference points every finding is ultimately argued against.

Fundamental audit concepts and principles. Independence and evidence: what makes evidence sufficient and appropriate, the difference between a finding and an opinion, sampling, and the professional scepticism the exam expects you to apply rather than merely describe.

Preparing an ISO/IEC 27001 audit. Everything before fieldwork: scope and objectives, reviewing documented information, building the audit plan and checklists, allocating the team, and judging whether the auditee is ready for a stage 2 audit at all.

Conducting an ISO/IEC 27001 audit. The heaviest domain, at nearly a quarter of the paper. On-site work: interviews and observation, following audit trails, classifying nonconformities by severity, and deciding what further evidence a conclusion needs before it can be defended.

Closing an ISO/IEC 27001 audit. Reporting and what follows: the closing meeting, the audit report, evaluating corrective action plans, and judging whether a nonconformity has genuinely been addressed rather than merely answered.

Managing an ISO/IEC 27001 audit program. The view above any single engagement: designing and monitoring an audit programme, competence and evaluation of auditors, and continual improvement of the programme itself.

ISO 27001 Lead Auditor exam facts

Questions: 80 multiple-choice questions, mixing standalone questions with scenario-based sets.
Scenario sets: A scenario is followed by exactly five questions about it — the format CertPrepX reproduces as scenario blocks.
Answer options: Three per question: one correct response and two distractors. Not four, as on most ISACA exams.
Passing score: 70%.
Open book: Permitted: a hard copy of the ISO/IEC 27001 standard, and your training course materials.
Exam duration: PECB does not publish a fixed duration for this exam. Candidates sitting a Lead-level exam in a language other than their native one are granted an extra 30 minutes.
Retakes: There is no limit on the number of attempts, though PECB applies waiting periods between them.
Certification: Passing the exam earns a credential only once the matching experience and audit hours are evidenced and the Code of Ethics is signed.

How CertPrepX helps you pass the ISO 27001 Lead Auditor

Adaptive practice that focuses on your weakest ISO 27001 Lead Auditor domains.
Full-length, timed mock exams that mirror the real ISO 27001 Lead Auditor format and scoring.
A readiness score per domain, so you know when you're ready to sit the exam.
Weak-area review and spaced repetition to lock in what you miss.
A personalized study plan built around your target ISO 27001 Lead Auditor exam date.

CertPrepX has 1,000 ISO/IEC 27001 Lead Auditor practice questions and 574 flashcards across all seven competency domains, including 16 complete scenario blocks that mirror the five-questions-per-scenario format of the real exam.

Who the ISO 27001 Lead Auditor is for

Auditors, consultants, and information security professionals who audit ISO/IEC 27001 management systems — internal, second-party, or certification audits. No prior credential is required to sit the exam.

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ISO 27001 Lead Auditor exam FAQ

How many questions are on the ISO/IEC 27001 Lead Auditor exam?

Eighty multiple-choice questions, combining standalone questions with scenario-based sets in which one scenario is followed by five related questions.

What is the passing score for the ISO 27001 Lead Auditor exam?

Seventy percent.

Is the ISO 27001 Lead Auditor exam open book?

Yes. PECB permits a hard copy of the ISO/IEC 27001 standard and your training course materials. Open book does not make it easier — the questions test judgement about audit evidence and nonconformity, which cannot be looked up.

How many answer options does each question have?

Three: one correct response and two distractors. That differs from most ISACA exams, which use four, so practice written for four options does not reflect this paper. CertPrepX serves these questions with three options.

Do I need experience to sit the exam?

No. Anyone can sit it. Experience determines which credential you receive afterwards: Provisional Auditor requires none, while Auditor, Lead Auditor, and Senior Lead Auditor require increasing work experience and audited hours.

What is the difference between Lead Auditor and Lead Implementer?

Lead Auditor is about auditing an ISMS — evidence, findings, and audit programmes. Lead Implementer is about building and running one. They are separate exams with different domains, and most people choose based on whether they audit or implement.

How many ISO 27001 Lead Auditor practice questions does CertPrepX have?

One thousand, across all seven competency domains, including sixteen complete scenario blocks, plus 574 flashcards. Every question includes a worked explanation of why the correct option is right and why the distractors are not.

Sources

Exam details on this page come from PECB’s own published materials and were last verified on 21 August 2026. PECB can change exam policy at any time, so confirm current requirements with PECB before you register.