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Certified Information Systems Security Professional CISSP Practice Test 51

Question 500

Clinicians approve delayed isolation of an infected medical device until safe backup monitoring is available. What residual risk must be explicitly governed?

  1. Assume the infection can never reach another device because the medical equipment is specialized.
  2. Discard the deadline once a clinician verbally approves temporary operation.
  3. Stop all monitoring because it might increase administrative workload.
  4. The continuing malware exposure and compensating segmentation, monitoring, deadlines and decision authority during the time-limited delay.

Explanation

Correct Answer

D:

Deferring containment to protect patients can be warranted only with deliberate risk ownership and controls reducing ongoing compromise or lateral movement.

Incorrect Answers

A:

Specialized operational technology can still share networks and vulnerabilities; residual spread must be assessed.

B:

A time-limited, documented safety exception needs reassessment and a plan to complete containment.

C:

Monitoring is a key compensation for the period when the threat cannot yet be fully removed.

Question 501

A hospital revises its cyber containment playbook for infected patient monitors. Which live or simulation outcome BEST validates both safety and security?

  1. The infected device is unplugged immediately, but nurses lose patient vital-sign visibility.
  2. In a supervised exercise, backup patient monitoring continues while malicious device communications are restricted and accountable staff document containment decisions.
  3. Patient monitoring remains available, but the infected device can freely connect to every clinical subnet.
  4. A change ticket says “incident closed” without clinical signoff or measured malicious-traffic restrictions.

Explanation

Correct Answer

B:

The test requires continuous critical clinical service together with reduced attack reachability and traceable cross-disciplinary decisions.

Incorrect Answers

A:

Pure technical isolation fails the explicit human-safety requirement.

C:

Availability without threat containment leaves an uncontrolled infection propagation path.

D:

Ticket status is not evidence of operationally safe and effective containment.

Question 502

A ransomware response team restores files to production immediately after finding a usable backup, but attacker persistence and stolen credentials are still active. What should precede service reconnection?

  1. Restore the data and reconnect it to all network segments before looking for attacker access.
  2. Delete every forensic log to reduce the chance ransomware finds its historical trace.
  3. Assume that backup completion status means the restored workload is malware-free and authorized for use.
  4. Validate a clean, isolated recovery environment, eradicate persistence, reset compromised identities, check restored data integrity and then reconnect under monitoring.

Explanation

Correct Answer

D:

Restoring files into a still-compromised environment can trigger immediate reinfection and repeat business loss. Recovery includes assurance that threat access is contained and removed.

Incorrect Answers

A:

Uncontrolled reconnection gives active malware or stolen credentials another opportunity to compromise recovered assets.

B:

Destroying investigation evidence prevents understanding and eradicating the original foothold.

C:

A backup can contain malicious state, and completion does not validate identities or production safety.

Question 503

A team restores ransomware-affected databases from a known-good historical snapshot. What residual threat should it still address before full customer access?

  1. Historical backups automatically revoke every stolen active access token.
  2. A clean database always proves the application runtime and build artifacts were uncompromised.
  3. Disabling alerts for the first week after recovery is safe because the data checksum passed.
  4. The recovery stack, credentials and connected services may still contain attacker persistence or compromise paths requiring validation and monitoring.

Explanation

Correct Answer

D:

A good data snapshot is only one part of recovery. Identity and environment trust must be re-established to avoid reinfection.

Incorrect Answers

A:

Backup restoration does not invalidate attacker credentials or end live sessions by itself.

B:

Data recovery does not establish executable integrity or absence of malicious hooks.

C:

Elevated monitoring is especially important when returning a formerly compromised system to service.

Question 504

An organization claims its ransomware recovery runbook avoids reinfection. Which drill result best substantiates that claim?

  1. A backup job completes, but the restored application is never launched or checked for persistence.
  2. Isolated restored services pass malware/persistence and credential checks, complete representative transactions and remain clean through monitored controlled reconnection.
  3. The restored server immediately contacts the known attacker endpoint after reconnection.
  4. The team records only the restore duration and omits identity/key checks and data integrity.

Explanation

Correct Answer

B:

A tested recovery combines data integrity, eradication, identity reset, functional service and observation after reconnection.

Incorrect Answers

A:

Copy completion cannot prove recovery, eradication or business usability.

C:

Active malicious communication shows the environment is not clean.

D:

RTO timing alone does not establish safe or complete post-ransomware recovery.

Question 505

After repeated credential theft incidents the team closes each ticket without adjusting controls or playbooks. As the accountable security practitioner, which response BEST addresses the specific weakness without introducing a different untested control?

  1. Close recurring phishing incidents once tickets are resolved, without examining how credentials were repeatedly stolen.
  2. Count completed incident reports as success without assigning corrective actions to control owners.
  3. Give staff a generic warning but never update the affected authentication or response playbooks.
  4. Perform root-cause and lessons-learned review, assign improvements and test remediation.

Explanation

Correct Answer

D:

The response lifecycle improves only when observed failure mechanisms lead to control changes. A published retrospective without owners and dates may not change actual behavior.

Incorrect Answers

A:

An unaddressed root cause leaves the same attack path open.

B:

Paper retrospectives do not change detection or preventive capabilities.

C:

Awareness alone may not correct repeatable technical and operational failures.

Question 506

The organization implemented the response to this scenario: After repeated credential theft incidents the team closes each ticket without adjusting controls or playbooks. The approved response was: Perform root-cause and lessons-learned review, assign improvements and test remediation. Which statement MOST accurately identifies a remaining risk or constraint?

  1. A published retrospective without owners and dates may not change actual behavior.
  2. A published lessons-learned report guarantees future similar incidents will be prevented without owners or retests.
  3. Ending an incident automatically means no security-control regression can occur later.
  4. Improving detection of one phishing variant proves every future credential theft method is covered.

Explanation

Correct Answer

A:

The response lifecycle improves only when observed failure mechanisms lead to control changes. A recurring simulated attack is detected or blocked faster after assigned corrective work.

Incorrect Answers

B:

Recommendations require assigned implementation and measured effectiveness.

C:

System changes and attacker adaptations need ongoing review.

D:

Lessons and rules should be tested against variants and risk contexts.

Question 507

Management implemented a response after this event: After repeated credential theft incidents the team closes each ticket without adjusting controls or playbooks. The response was: Perform root-cause and lessons-learned review, assign improvements and test remediation. Which observed outcome BEST verifies that the intended security protection operates, rather than merely appearing in a plan?

  1. The same simulated phishing-to-account-compromise path succeeds after the corrective-action deadline.
  2. A recurring simulated attack is detected or blocked faster after assigned corrective work.
  3. Meeting minutes list lessons but the owner and completion dates for control changes are blank.
  4. Tickets close faster, but subsequent account theft remains undetected until customers complain.

Explanation

Correct Answer

B:

A recurring simulated attack is detected or blocked faster after assigned corrective work. The response lifecycle improves only when observed failure mechanisms lead to control changes.

Incorrect Answers

A:

The identified cause was not effectively remediated.

C:

A discussion is not accountable improvement.

D:

Resolution speed alone does not prove prevention or response quality improved.

Question 508

A critical network sensor must observe suspected attacks without risking packet drops from immature signatures. As the accountable security practitioner, which response BEST addresses the specific weakness without introducing a different untested control?

  1. Deploy detection-only monitoring until rules are validated for safe inline prevention.
  2. Immediately place untested IDS signatures inline on a life-critical network with no bypass or validation.
  3. Disable all attack monitoring to avoid packet drops during initial tuning.
  4. Treat an alerting sensor as a blocking control even though it is not placed in the packet path.

Explanation

Correct Answer

A:

An IDS alerts; an IPS inline can block traffic and create availability risks when mistaken. Passive monitoring alone cannot stop an active attack and needs clear escalation paths.

Incorrect Answers

B:

False positives could drop essential business traffic before rules are safe for prevention.

C:

Detection-only sensors can provide visibility without inline interference.

D:

Passive IDS observations do not themselves stop an active attack.

Question 509

The organization implemented the response to this scenario: A critical network sensor must observe suspected attacks without risking packet drops from immature signatures. The approved response was: Deploy detection-only monitoring until rules are validated for safe inline prevention. Which statement MOST accurately identifies a remaining risk or constraint?

  1. An IDS alert automatically blocks the triggering packet just like an inline IPS rule.
  2. Passive monitoring alone cannot stop an active attack and needs clear escalation paths.
  3. An IPS never creates availability risk because only known malicious traffic can match signatures.
  4. Operating in detection-only mode means incidents require no escalation because no packets are dropped.

Explanation

Correct Answer

B:

An IDS alerts; an IPS inline can block traffic and create availability risks when mistaken. Attack traffic triggers alerts and valid business packets remain uninterrupted during tuning.

Incorrect Answers

A:

Passive detection cannot prevent traffic unless coupled to an enforcement response.

C:

False-positive matches and rule bugs can disrupt legitimate packets.

D:

Monitoring needs a defined investigative and containment process.

Question 510

Management implemented a response after this event: A critical network sensor must observe suspected attacks without risking packet drops from immature signatures. The response was: Deploy detection-only monitoring until rules are validated for safe inline prevention. Which observed outcome BEST verifies that the intended security protection operates, rather than merely appearing in a plan?

  1. A harmless business packet is dropped by a new signature during a test.
  2. Malicious traffic triggers IDS alerts but analysts mistakenly report that the packets were blocked inline.
  3. No packet loss occurs because the detection system is turned off, and malicious probes generate no alerts.
  4. Attack traffic triggers alerts and valid business packets remain uninterrupted during tuning.

Explanation

Correct Answer

D:

Attack traffic triggers alerts and valid business packets remain uninterrupted during tuning. An IDS alerts; an IPS inline can block traffic and create availability risks when mistaken.

Incorrect Answers

A:

The unvalidated prevention rule is not safe for the critical network.

B:

Alerting evidence cannot establish a preventive outcome.

C:

Availability alone does not demonstrate monitored protection.

Certified Information Systems Security Professional (CISSP) Practice Tests

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