CompTIA Security+

Security+ performance-based questions: what they are and how to practise them

Security+ PBQs commonly ask you to place controls, match attacks to mitigations, or order an incident response. They are the part of the exam where knowing a definition is least useful and knowing why a control belongs somewhere is most useful.

What the exam is measuring

Why these questions exist

Security+ PBQs test placement and sequence: not what a control is, but where it goes and when it is applied. That is precisely the distinction between a candidate who memorised the acronym list and one who understands the architecture.

On the real exam these appear as performance-based questions (PBQs). Multiple-choice (single and multiple response) plus performance-based questions (PBQs)

  • For control-placement tasks, decide what you are protecting before deciding what to deploy. The asset determines the control, not the reverse.
  • For incident-response ordering, containment precedes eradication and eradication precedes recovery. Most wrong orderings restore service before the attacker is removed.
  • When two answers both look defensible, prefer the one that addresses the cause rather than the symptom.

Try three questions. Understand every answer.

Original English practice examples, with answers and explanations available here. No account required. These are independent teaching examples, not official exam questions or exam dumps.

Question 1 of 3 · Threats, vulnerabilities, and mitigations

An internet-facing service has an actively exploited vulnerability. The vendor has no patch yet, but offers a documented workaround that blocks the known exploit path. Which action best reduces immediate risk without claiming the flaw is permanently fixed?

Answer and explanation

Best answer: Validate and apply the workaround, monitor it, and track the pending patch

A validated compensating control can reduce exposure while the permanent fix is pending. Retain the vulnerability record, residual risk, and a plan to apply and verify the patch.

Why the other choices fit less well

Waiting leaves exposure unchanged, and a hostname change does not block the flaw. A workaround reduces risk without necessarily removing the vulnerability, so closing it as permanently fixed overstates the evidence.

CISA: known exploited vulnerabilities

Question 2 of 3 · Security architecture

An analyst needs read-only access to one reporting dataset for a two-week investigation. Which access decision best follows least privilege?

Answer and explanation

Best answer: Grant approved read-only access to that dataset with a reviewed expiry

Limit permissions to the approved task, resource and duration. Review the expiry and record the grant so access can be removed when the investigation ends.

Why the other choices fit less well

Permanent administrator rights exceed the task. Shared credentials weaken individual accountability. Disabling logs removes evidence without reducing the permissions required.

NIST: least privilege

Question 3 of 3 · Security operations

An investigator hashes a collected log file, then transfers it to an analysis workstation. The hash of the received file differs. What is the most defensible next step?

Answer and explanation

Best answer: Preserve both records and investigate or repeat the transfer before relying on the copy

The received bytes have not passed the expected integrity check. Preserve the acquisition record and investigate the discrepancy or acquire a verified copy.

Why the other choices fit less well

A filename does not establish byte-level integrity. Replacing the original hash hides the discrepancy. Do not describe the copy as verified until the mismatch is resolved.

NIST: forensic evidence handling

Choose your next step

Free practice questions: 20 for Security+. Create a free account to save your progress. No card required.

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What you get here

How we practise them

Our Security+ bank contains 31 PBQ-style exercises in two formats: matching tasks, where you pair each requirement to the capability that satisfies it, and ordering tasks, where you sequence the steps of a procedure. Each one carries the same full explanation as the multiple-choice questions, covering why the correct arrangement is right and why the plausible alternative is not.

These train the reasoning the exam tests — sequence, placement, and matching — rather than reproducing a vendor's simulation interface. Nothing here recreates the exam environment itself, and no practice product legitimately can.

See where you stand on Security+

20 free questions, no card required. Your domain scores show which areas need work before you book the exam.

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Practice with perspective

Learn the decision behind the answer.

Work through the scenario, identify the evidence that matters, then compare your reasoning with the explanation. Use domain scores to choose your next study session. A practice percentage is a learning signal, not a prediction or an official exam score.

The newest practice set is available in eight languages. Earlier exercises may appear in English. These are original independent practice scenarios, not official exam questions.