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ISC CISSP Practice Test 65

Question 640

A manufacturer uses industrial controllers whose processes cannot tolerate active port scans during production. A designer proposes: Run aggressive authenticated scanning on live controllers at maximum concurrency. What is the MOST significant security deficiency in this proposal?

  1. Injection tests do not establish who may read a specific resource.
  2. Maintenance conditions may permit stronger active validation with managed safety risk.
  3. Broken object-level authorization can exist despite correctly working sign-in.
  4. Disruptive scanning may interrupt fragile controllers and create safety hazards.

Explanation

Correct Answer

D:

Disruptive scanning may interrupt fragile controllers and create safety hazards. This is the direct weakness in the proposed action.

Incorrect Answers

A:

This is a limitation elsewhere: A customer-facing API uses valid credentials but clients can modify numeric customer IDs to read other accounts. It does not explain the deficiency of the specified proposed approach.

B:

This explains a later shift in requirements (The plant schedules a verified maintenance outage for selected devices.), not the failure of the current proposal.

C:

This is an advantage of another design (Perform authenticated object-level authorization tests across user and tenant roles.), not the particular flaw of Run aggressive authenticated scanning on live controllers at maximum concurrency.

Question 641

A manufacturer uses industrial controllers whose processes cannot tolerate active port scans during production. The organization has now implemented this response: Plan passive discovery and lab-based tests coordinated with plant safety owners. Which observation would MOST directly demonstrate that the security objective was met?

  1. Mapped simulated techniques produce expected telemetry and documented analyst actions.
  2. Reports reconcile critical internet exposure to treatment dates and risk-owner decisions.
  3. An approved change ticket for Plan passive discovery and lab-based tests coordinated with plant safety owners. without a completed verification result.
  4. Passive inventory matches lab evidence and production monitoring records no process impact.

Explanation

Correct Answer

D:

Passive inventory matches lab evidence and production monitoring records no process impact. This validates that safety-critical OT testing must avoid disruptive techniques that threaten physical operations.

Incorrect Answers

A:

This demonstrates controls in another circumstance: A security operations team wants to test whether its analysts detect a known adversary's lateral movement technique.

B:

This other observation is relevant to: A vulnerability program reports only raw findings, mixing exposed critical devices with low-risk disconnected test machines.

C:

An approved change without an executed test cannot prove operating effectiveness. The needed evidence is Passive inventory matches lab evidence and production monitoring records no process impact.

Question 642

A previous security situation was: A manufacturer uses industrial controllers whose processes cannot tolerate active port scans during production. Now the requirement changes: The plant schedules a verified maintenance outage for selected devices. Which NEW action BEST answers the changed need?

  1. Plan passive discovery and lab-based tests coordinated with plant safety owners.
  2. Run aggressive authenticated scanning on live controllers at maximum concurrency.
  3. Passive inventory matches lab evidence and production monitoring records no process impact.
  4. Conduct a controlled active test on the approved isolated maintenance window.

Explanation

Correct Answer

D:

Maintenance conditions may permit stronger active validation with managed safety risk. The revised action is Conduct a controlled active test on the approved isolated maintenance window.

Incorrect Answers

A:

This is the appropriate response to the original situation: Safety-critical OT testing must avoid disruptive techniques that threaten physical operations. It does not directly meet the new condition.

B:

This remains inappropriate: Disruptive scanning may interrupt fragile controllers and create safety hazards.

C:

This is a record of how the initial safeguard would be checked, not an action implementing the newly requested condition: Passive inventory matches lab evidence and production monitoring records no process impact.

Question 643

A backup dashboard reports successful copy jobs, but no administrator has actually restored the database. What should the security manager recommend as the MOST appropriate response to the current requirement?

  1. Test key recovery and restore dependencies for the new backup architecture.
  2. Measure telemetry completeness against an authoritative asset inventory and alert on coverage gaps.
  3. Measure restoration success, integrity and achieved RTO/RPO in representative exercises.
  4. Use the 'last backup successful' indicator as conclusive disaster recovery proof.

Explanation

Correct Answer

C:

A completed backup does not guarantee recoverability or timely restoration. This directly addresses the stated situation.

Incorrect Answers

A:

This is appropriate for a later condition (The application moves to an encrypted backup provider with customer-owned keys.), but it does not directly resolve the initial need. Encryption key availability becomes a critical recovery dependency.

B:

This response addresses a different condition: An organization monitors security log coverage but does not notice that its most sensitive servers stopped forwarding events. The present case requires the measure described by Measure restoration success, integrity and achieved RTO/RPO in representative exercises.

D:

Copy-job success does not validate decryptability, consistency or restore procedures. The proposal would not be defensible for this case.

Question 644

A backup dashboard reports successful copy jobs, but no administrator has actually restored the database. A designer proposes: Use the 'last backup successful' indicator as conclusive disaster recovery proof. What is the MOST significant security deficiency in this proposal?

  1. Encryption key availability becomes a critical recovery dependency.
  2. Effectiveness should be measured by outcomes rather than training consumption.
  3. Copy-job success does not validate decryptability, consistency or restore procedures.
  4. Training volume alone does not quantify improved response.

Explanation

Correct Answer

C:

Copy-job success does not validate decryptability, consistency or restore procedures. This is the direct weakness in the proposed action.

Incorrect Answers

A:

This explains a later shift in requirements (The application moves to an encrypted backup provider with customer-owned keys.), not the failure of the current proposal.

B:

This is an advantage of another design (Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions.), not the particular flaw of Use the 'last backup successful' indicator as conclusive disaster recovery proof.

D:

This is a limitation elsewhere: A security awareness program tracks course attendance but not user reporting behavior during phishing tests. It does not explain the deficiency of the specified proposed approach.

Question 645

A backup dashboard reports successful copy jobs, but no administrator has actually restored the database. The team must implement a defensible safeguard AND demonstrate that it works. Which TWO entries form that control-and-evidence pair? (Select TWO.)

  1. Quarterly restore tests produce integrity comparisons and timed recovery records.
  2. Use the 'last backup successful' indicator as conclusive disaster recovery proof.
  3. Test key recovery and restore dependencies for the new backup architecture.
  4. Provide entitlement diffs, risk context and reviewer accountability for meaningful recertification.
  5. Measure restoration success, integrity and achieved RTO/RPO in representative exercises.

Explanation

Correct Answers

A:

Correct verification. The specific evidence is: Quarterly restore tests produce integrity comparisons and timed recovery records.

E:

Correct control. A completed backup does not guarantee recoverability or timely restoration.

Incorrect Answers

B:

Copy-job success does not validate decryptability, consistency or restore procedures.

C:

This concerns a later and different need: The application moves to an encrypted backup provider with customer-owned keys. Encryption key availability becomes a critical recovery dependency.

D:

The proposed control fits another scenario: A privilege access-review process is required quarterly, but managers approve entire lists without examining entitlement changes. It does not directly address this scenario's primary requirement.

Question 646

A previous security situation was: A backup dashboard reports successful copy jobs, but no administrator has actually restored the database. Now the requirement changes: The application moves to an encrypted backup provider with customer-owned keys. Which NEW action BEST answers the changed need?

  1. Use the 'last backup successful' indicator as conclusive disaster recovery proof.
  2. Quarterly restore tests produce integrity comparisons and timed recovery records.
  3. Test key recovery and restore dependencies for the new backup architecture.
  4. Measure restoration success, integrity and achieved RTO/RPO in representative exercises.

Explanation

Correct Answer

C:

Encryption key availability becomes a critical recovery dependency. The revised action is Test key recovery and restore dependencies for the new backup architecture.

Incorrect Answers

A:

This remains inappropriate: Copy-job success does not validate decryptability, consistency or restore procedures.

B:

This is a record of how the initial safeguard would be checked, not an action implementing the newly requested condition: Quarterly restore tests produce integrity comparisons and timed recovery records.

D:

This is the appropriate response to the original situation: A completed backup does not guarantee recoverability or timely restoration. It does not directly meet the new condition.

Question 647

A security awareness program tracks course attendance but not user reporting behavior during phishing tests. What should the security manager recommend as the MOST appropriate response to the current requirement?

  1. Measure restoration success, integrity and achieved RTO/RPO in representative exercises.
  2. Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions.
  3. Increase the number of training emails and assume that proves better behavior.
  4. Develop role-based voice fraud exercises and relevant reporting measures.

Explanation

Correct Answer

B:

Effectiveness should be measured by outcomes rather than training consumption. This directly addresses the stated situation.

Incorrect Answers

A:

This response addresses a different condition: A backup dashboard reports successful copy jobs, but no administrator has actually restored the database. The present case requires the measure described by Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions.

C:

Training volume alone does not quantify improved response. The proposal would not be defensible for this case.

D:

This is appropriate for a later condition (A new executive cohort faces targeted voice phishing rather than email attacks.), but it does not directly resolve the initial need. Threat-specific training needs outcome metrics suited to the new attack channel.

Question 648

A security awareness program tracks course attendance but not user reporting behavior during phishing tests. A designer proposes: Increase the number of training emails and assume that proves better behavior. What is the MOST significant security deficiency in this proposal?

  1. A rubber-stamped review is not evidence of appropriate least privilege.
  2. Training volume alone does not quantify improved response.
  3. Approval volume does not establish correct membership decisions.
  4. Threat-specific training needs outcome metrics suited to the new attack channel.

Explanation

Correct Answer

B:

Training volume alone does not quantify improved response. This is the direct weakness in the proposed action.

Incorrect Answers

A:

This is an advantage of another design (Provide entitlement diffs, risk context and reviewer accountability for meaningful recertification.), not the particular flaw of Increase the number of training emails and assume that proves better behavior.

C:

This is a limitation elsewhere: A privilege access-review process is required quarterly, but managers approve entire lists without examining entitlement changes. It does not explain the deficiency of the specified proposed approach.

D:

This explains a later shift in requirements (A new executive cohort faces targeted voice phishing rather than email attacks.), not the failure of the current proposal.

Question 649

A security awareness program tracks course attendance but not user reporting behavior during phishing tests. The organization has now implemented this response: Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions. Which observation would MOST directly demonstrate that the security objective was met?

  1. An approved change ticket for Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions. without a completed verification result.
  2. Controlled exercises show a statistically meaningful improvement in safe reporting.
  3. Reports reconcile critical internet exposure to treatment dates and risk-owner decisions.
  4. Sampled reviews identify removed excess rights with documented rationale and follow-up.

Explanation

Correct Answer

B:

Controlled exercises show a statistically meaningful improvement in safe reporting. This validates that effectiveness should be measured by outcomes rather than training consumption.

Incorrect Answers

A:

An approved change without an executed test cannot prove operating effectiveness. The needed evidence is Controlled exercises show a statistically meaningful improvement in safe reporting.

C:

This demonstrates controls in another circumstance: A vulnerability program reports only raw findings, mixing exposed critical devices with low-risk disconnected test machines.

D:

This other observation is relevant to: A privilege access-review process is required quarterly, but managers approve entire lists without examining entitlement changes. In the current case, the assessed requirement is: A security awareness program tracks course attendance but not user reporting behavior during phishing tests. The organization has now implemented this response: Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions. Which observation would MOST directly demonstrate that the security objective was met.

Question 650

A previous security situation was: A security awareness program tracks course attendance but not user reporting behavior during phishing tests. Now the requirement changes: A new executive cohort faces targeted voice phishing rather than email attacks. Which NEW action BEST answers the changed need?

  1. Controlled exercises show a statistically meaningful improvement in safe reporting.
  2. Develop role-based voice fraud exercises and relevant reporting measures.
  3. Use appropriate behavioral metrics such as reporting accuracy, time-to-report and repeated risky actions.
  4. Increase the number of training emails and assume that proves better behavior.

Explanation

Correct Answer

B:

Threat-specific training needs outcome metrics suited to the new attack channel. The revised action is Develop role-based voice fraud exercises and relevant reporting measures.

Incorrect Answers

A:

This is a record of how the initial safeguard would be checked, not an action implementing the newly requested condition: Controlled exercises show a statistically meaningful improvement in safe reporting.

C:

This is the appropriate response to the original situation: Effectiveness should be measured by outcomes rather than training consumption. It does not directly meet the new condition.

D:

This remains inappropriate: Training volume alone does not quantify improved response.

Certified Information Systems Security Professional (CISSP) Practice Tests