PECB ISO/IEC 27001 Lead Auditor Exam Practice Questions, practice question pack
PECB · ISO/IEC 27001 Lead Auditor

PECB ISO/IEC 27001 Lead Auditor Exam Practice Questions

249 questionsPDF by emailUpdated September 2026

US$39

Try 10 questions free

Card, Apple Pay or Google Pay. Your PDF is sent by email as soon as you check out.

Pass or your money backFail the exam after using this pack and we refund it. How the guarantee works
Category:
TRY BEFORE YOU BUY

Three of the 249 questions in this pack

Question 1

Scenario: Northstorm is an online retail shop offering unique vintage and modern accessories. It initially entered a small market but gradually grew thanks to the development of the overall e-commerce landscape. Northstorm works exclusively on line and ensures efficient payment processing, inventory management, marketing tools, and shipment orders. It uses prioritized ordering to receive, restock, and ship its most popular products. Northstorm has traditionally managed its IT operations by hosting its website and maintaining full control over its infrastructure, including hardware, software, and data administration. However, this approach hindered its growth due to the lack of responsive infrastructure. Seeking to enhance its e-commerce and payment systems, Northstorm opted to expand its in-house data centers, completing the expansion in two phases over three months. Initially, the company upgraded its core servers, point-of-sale, ordering, billing, database, and backup systems. The second phase involved improving mail, payment, and network functionalities. Additionally, during this phase, Northstorm adopted an international standard for personal identifiable information (PII) controllers and PII processors regarding PII processing to ensure its data handling practices were secure and compliant with global regulations. Despite the expansion, Northstorm's upgraded data centers failed to meet its evolving business demands. This inadequacy led to several new challenges, including issues with order prioritization. Customers reported not receiving priority orders, and the company struggled with responsiveness. This was largely due to the main server's inability to process orders from YouDecide, an application designed to prioritize orders and simulate customer interactions. The application, reliant on advanced algorithms, was incompatible with the new operating system (OS) installed during the upgrade. Faced with urgent compatibility issues, Northstorm quickly patched the application without proper validation, leading to the installation of a compromised version. This security lapse resulted in the main server being affected and the company's website going offline for a week. Recognizing the need for a more reliable solution, the company decided to outsource its website hosting to an e-commerce provider. The company signed a confidentiality agreement concerning product ownership and conducted a thorough review of user access rights to enhance security before transitioning. Based on the scenario above, answer the following question: Which of the following situations represents a vulnerability in Northstorm's systems?

  1. The new version of the application directly affected the main server
  2. The need for a replacement version of the application
  3. The new version of the application was not legitimate
Show answer and explanation

Correct answer: C. The new version of the application was not legitimate

A vulnerability is a weakness in an asset or control that can be exploited. Northstorm rushed the patch without validation and ended up running an illegitimate, compromised version of YouDecide, so the software running on the main server was itself the weak point in the system. That unverified, non-legitimate application is the weakness that allowed the server to be affected and the website to go offline.

Why the other options are wrong

  • A. The effect on the main server is the impact of the incident, not the weakness that allowed it.
  • B. Needing a replacement version is a business and compatibility requirement, not a weakness in the system.

Question 2

Scenario: Northstorm is an online retail shop offering unique vintage and modern accessories. It initially entered a small market but gradually grew thanks to the development of the overall e-commerce landscape. Northstorm works exclusively on line and ensures efficient payment processing, inventory management, marketing tools, and shipment orders. It uses prioritized ordering to receive, restock, and ship its most popular products. Northstorm has traditionally managed its IT operations by hosting its website and maintaining full control over its infrastructure, including hardware, software, and data administration. However, this approach hindered its growth due to the lack of responsive infrastructure. Seeking to enhance its e-commerce and payment systems, Northstorm opted to expand its in-house data centers, completing the expansion in two phases over three months. Initially, the company upgraded its core servers, point-of-sale, ordering, billing, database, and backup systems. The second phase involved improving mail, payment, and network functionalities. Additionally, during this phase, Northstorm adopted an international standard for personal identifiable information (PII) controllers and PII processors regarding PII processing to ensure its data handling practices were secure and compliant with global regulations. Despite the expansion, Northstorm's upgraded data centers failed to meet its evolving business demands. This inadequacy led to several new challenges, including issues with order prioritization. Customers reported not receiving priority orders, and the company struggled with responsiveness. This was largely due to the main server's inability to process orders from YouDecide, an application designed to prioritize orders and simulate customer interactions. The application, reliant on advanced algorithms, was incompatible with the new operating system (OS) installed during the upgrade. Faced with urgent compatibility issues, Northstorm quickly patched the application without proper validation, leading to the installation of a compromised version. This security lapse resulted in the main server being affected and the company's website going offline for a week. Recognizing the need for a more reliable solution, the company decided to outsource its website hosting to an e-commerce provider. The company signed a confidentiality agreement concerning product ownership and conducted a thorough review of user access rights to enhance security before transitioning. Which principle of information security has been affected regarding the website issue in scenario?

  1. Availability, because Northstorm's website was unavailable
  2. Integrity, because the new operating system did not support the application
  3. Confidentiality, because Northstorm's website was hosted on the provider's servers
Show answer and explanation

Correct answer: A. Availability, because Northstorm's website was unavailable

unavailable The CIA triad consists of Confidentiality, Integrity, and Availability. The website going offline for a week directly violates Availability, the principle that information and systems must be accessible and functional when needed. While option B mentions operating system incompatibility, this is a technical incompatibility issue, not an integrity breach of data. Option C mischaracterizes the issue; hosting with a provider affects confidentiality only if data is improperly exposed, which is not described. The core security principle affected by the week-long outage is Availability.

Why the other options are wrong

  • B. The OS incompatibility is a technical problem, not a violation of data integrity principles.
  • C. Confidentiality concerns access to sensitive data; the issue here is service unavailability, not unauthorized data exposure.

Question 3

Scenario: Northstorm is an online retail shop offering unique vintage and modern accessories. It initially entered a small market but gradually grew thanks to the development of the overall e-commerce landscape. Northstorm works exclusively on line and ensures efficient payment processing, inventory management, marketing tools, and shipment orders. It uses prioritized ordering to receive, restock, and ship its most popular products. Northstorm has traditionally managed its IT operations by hosting its website and maintaining full control over its infrastructure, including hardware, software, and data administration. However, this approach hindered its growth due to the lack of responsive infrastructure. Seeking to enhance its e-commerce and payment systems, Northstorm opted to expand its in-house data centers, completing the expansion in two phases over three months. Initially, the company upgraded its core servers, point-of-sale, ordering, billing, database, and backup systems. The second phase involved improving mail, payment, and network functionalities. Additionally, during this phase, Northstorm adopted an international standard for personal identifiable information (PII) controllers and PII processors regarding PII processing to ensure its data handling practices were secure and compliant with global regulations. Despite the expansion, Northstorm's upgraded data centers failed to meet its evolving business demands. This inadequacy led to several new challenges, including issues with order prioritization. Customers reported not receiving priority orders, and the company struggled with responsiveness. This was largely due to the main server's inability to process orders from YouDecide, an application designed to prioritize orders and simulate customer interactions. The application, reliant on advanced algorithms, was incompatible with the new operating system (OS) installed during the upgrade. Faced with urgent compatibility issues, Northstorm quickly patched the application without proper validation, leading to the installation of a compromised version. This security lapse resulted in the main server being affected and the company's website going offline for a week. Recognizing the need for a more reliable solution, the company decided to outsource its website hosting to an e-commerce provider. The company signed a confidentiality agreement concerning product ownership and conducted a thorough review of user access rights to enhance security before transitioning. Which of the following is a preventive control based on scenario?

  1. Using an application that prioritized orders based on its prior knowledge
  2. Signing a confidentiality agreement
  3. Expanding the capacity of the in-house data center
Show answer and explanation

Correct answer: B. Signing a confidentiality agreement

Preventive controls stop security incidents before they occur. A confidentiality agreement, signed before transitioning to the e-commerce provider, is a legal and administrative control designed to prevent unauthorized disclosure of proprietary information, it actively prevents a potential harm. Option A describes an existing business function (the YouDecide application), not a control implemented to prevent security issues. Option C expands capacity but does not prevent the specific security vulnerabilities that caused the incident; capacity expansion alone without proper testing and validation did not prevent the compromise. The confidentiality agreement is the proactive preventive measure.

Why the other options are wrong

  • A. This is an existing business application, not a control measure implemented to prevent security incidents.
  • C. Capacity expansion is a reactive business decision that does not inherently prevent security vulnerabilities or breaches.

See all 10 free questions Get the full pack, US$39

249 practice questions for PECB ISO/IEC 27001 Lead Auditor, with full explanations.

Every question comes with the correct answer, the reasoning behind it, and a short note on why each wrong option is wrong. Work through it once with the answers, then again with the questions-only copy under exam conditions.

  • 249 questions across all seven Lead Auditor domains
  • Answers and explanations for every question, including the wrong options
  • A questions-only PDF for timed practice runs
  • Instant delivery by email the moment you check out
  • Free monthly updates for as long as the exam is live
  • Pass or your money back

PECB does not publish a standalone exam price: the exam is bundled into the accredited training course, priced by each PECB partner. This pack is US$39, paid once.

Try 10 questions free before you buy.

Last updated September 2026 · 249 questions

What makes the ISO/IEC 27001 Lead Auditor hard

Lead Auditor tests how an audit runs, not how well you know the standard. Plenty of candidates can recite Annex A and still get caught, because the exam keeps asking a different question.

You are three days into a certification audit and have found something. Is it a nonconformity or an observation? Major or minor? Do you raise it now or gather more evidence first? Will your sample survive the closing meeting, or can the client challenge it? ISO/IEC 27001 defines what good looks like; ISO 19011 defines how to prove it, and that is where the marks are.

The exam is open book and multiple choice, with 70% needed to pass. The seven domains run from ISMS fundamentals through to managing an audit programme, so the audit scenarios need to be familiar well before the day.

About the exam

The ISO/IEC 27001 Lead Auditor is PECB’s certification for professionals who plan, lead and report audits of an Information Security Management System against ISO/IEC 27001, following the auditing guidelines of ISO 19011. It validates the ability to manage an audit team and run an audit programme, not just assess controls.

Exam domains

  • Domain 1: Fundamental principles and concepts of an ISMS
  • Domain 2: ISMS requirements
  • Domain 3: Fundamental audit concepts and principles
  • Domain 4: Preparing an ISO/IEC 27001 audit
  • Domain 5: Conducting an ISO/IEC 27001 audit
  • Domain 6: Closing an ISO/IEC 27001 audit
  • Domain 7: Managing an ISO/IEC 27001 audit programme

Open book, multiple choice, scenario based, pass mark 70%. There is no standalone exam price: the exam, the certification application and the first year of the annual maintenance fee are bundled into the accredited training course, which each PECB partner prices itself.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Questions before you buy

What do I get when I buy the PECB ISO/IEC 27001 Lead Auditor pack?

249 practice questions as a PDF, each with the correct answer, a full explanation and a note on why the other options are wrong, plus a separate questions-only PDF for timed practice.

How quickly do I receive it?

Your PDF is prepared and sent to your email address after checkout, and you get a confirmation as soon as it is on its way.

Is there a free sample?

Yes. Ten questions from this pack, with answers and explanations, are free on this page and as a PDF, so you can judge the quality before you pay.

Are updates included?

Yes. The pack is updated every month for as long as the exam is live, and updates are free for everyone who has bought it.

What if I fail the exam?

We refund the pack. Sit the exam 7 to 30 days after buying, then send your official score report within 7 days of the exam date, as set out in the refund policy.

Can I share it with colleagues?

Each purchase is licensed to one person. For a team, school or training organisation, email support@certstash.com for a licence that fits.

Related products