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CompTIA CS0-003 Practice Test 100

Question 990

A containment playbook runs automatically at 10:05 but isolation completes only at 10:17. What is the MOST appropriate analyst action based on the evidence?

  1. Track technical eradication and legal case closure as separate milestones.
  2. Measure completed containment from appropriate start, not API submission.
  3. Flag the metric as limited and assess better event-onset evidence.
  4. Normalize workload by complexity and relevant operational scope.

Explanation

Correct Answer

B:

Asynchronous action initiation is not achieved response outcome. Report true automation containment completion time.

Incorrect Answers

A:

Operational response time should not be conflated with administrative lifecycle. That is relevant to incident response metric definitions, not to report true automation containment completion time.

C:

Detection-time metrics cannot be precise without a consistent true start. It could help qualify MTTD when onset unknown, but it would not report true automation containment completion time.

D:

Raw counts can penalize analysts handling complex incidents. That is relevant to incident response metric definitions, not to report true automation containment completion time.

Question 991

A partner depends on an API that remains disabled for containment but receives no update. Which next step is MOST defensible for the security team?

  1. Communicate confidence ranges and dependencies rather than unsupported certainty.
  2. State partial technical restoration until business validation is complete.
  3. Provide approved partner-specific status and safe alternative or mitigation.
  4. Provide service-level transaction impact and recovery estimates with uncertainty.

Explanation

Correct Answer

C:

Third-party business dependencies require coordinated incident communication. Update impacted API business partner.

Incorrect Answers

A:

Honest forecasts depend on verified restoration prerequisites. It would report uncertain incident recovery timing, but it would not update impacted API business partner.

B:

Availability tests do not prove restored business correctness. It could help distinguish technical restore from business recovery, but it would not update impacted API business partner.

D:

Business stakeholders need outcome-based operational information. It would communicate payment service outage impact, but it would not update impacted API business partner.

Question 992

A public statement promises all service data restored before integrity verification finishes. Which action BEST aligns with sound security operations?

  1. Include open risks, owners, next milestones and blockers with confirmed facts.
  2. Pause distribution and use authorized customer-specific communications review.
  3. Shift incident command to a trusted out-of-band communications channel.
  4. Correct the wording to distinguish availability from validated data integrity.

Explanation

Correct Answer

D:

Service recovery claims must match actual verification status. Avoid unsupported full data recovery announcement.

Incorrect Answers

A:

Status updates should support decision-making and accountability. It could help report unresolved incident work transparently, but it would not avoid unsupported full data recovery announcement.

B:

Unfiltered technical disclosures can be inaccurate and expose sensitive infrastructure. That is relevant to communication under investigation pressure, not to avoid unsupported full data recovery announcement.

C:

Response planning must not leak through potentially compromised systems. It would secure incident command during email compromise, but it would not avoid unsupported full data recovery announcement.

Question 993

An API attack retrieved 120 records successfully but attempted 8,000 other object IDs. Which response BEST addresses the security problem described?

  1. Report confirmed accessed records and separately state attempted enumeration.
  2. Report attempted attack volume without claiming 500 compromised accounts.
  3. Evaluate host and tenant dependencies before limiting scope to one VM.
  4. Report availability impact and data loss as separate dimensions.

Explanation

Correct Answer

A:

Evidence-specific counts prevent exaggerated victim estimates. Quantify confirmed API disclosure correctly.

Incorrect Answers

B:

Request counts are not equivalent to successful compromise counts. It would distinguish attack attempts from affected users, but it would not quantify confirmed API disclosure correctly.

C:

Shared infrastructure can broaden the potential blast radius. It could help assess virtualization incident scope, but it would not quantify confirmed API disclosure correctly.

D:

Downtime does not necessarily imply permanent data loss. That is relevant to incident impact and scope classification, not to quantify confirmed API disclosure correctly.

Question 994

A successful unauthorized database modification affects billing records but no records were stolen. Which investigative or response action BEST fits the evidence?

  1. Describe business service availability and fallback status distinctly.
  2. Emphasize integrity impact and reconciliation requirements.
  3. Evaluate potential domain-wide privilege reach, not just compromised-host count.
  4. Report actual availability impact rather than assuming enterprise data breach.

Explanation

Correct Answer

B:

Data tampering can have severe financial consequences without exfiltration. Report significant integrity incident without theft.

Incorrect Answers

A:

Impact reporting should differentiate affected and unaffected operations. It would communicate bounded authentication outage impact, but it would not report significant integrity incident without theft.

C:

Small observed host scope can carry broad credential impact. That is relevant to incident severity versus impact reporting, not to report significant integrity incident without theft.

D:

Host count alone does not imply confidentiality loss. It would separate large host count from data breach, but it would not report significant integrity incident without theft.

Question 995

A malware alert on one virtual host is correlated with a compromised shared hypervisor. What is the MOST appropriate analyst action based on the evidence?

  1. Report attempted attack volume without claiming 500 compromised accounts.
  2. Report availability impact and data loss as separate dimensions.
  3. Evaluate host and tenant dependencies before limiting scope to one VM.
  4. Report confirmed accessed records and separately state attempted enumeration.

Explanation

Correct Answer

C:

Shared infrastructure can broaden the potential blast radius. Assess virtualization incident scope.

Incorrect Answers

A:

Request counts are not equivalent to successful compromise counts. It could help distinguish attack attempts from affected users, but it would not assess virtualization incident scope.

B:

Downtime does not necessarily imply permanent data loss. That is relevant to incident impact and scope classification, not to assess virtualization incident scope.

D:

Evidence-specific counts prevent exaggerated victim estimates. It could help quantify confirmed API disclosure correctly, but it would not assess virtualization incident scope.

Question 996

A high-priority alert comes from a known approved red-team exercise. Which next step is MOST defensible for the security team?

  1. Measure false negatives and true-positive yield against known incidents.
  2. Compare source duplicates, true-positive yield and new telemetry coverage.
  3. Normalize volume by monitored population and source fidelity before comparison.
  4. Record authorized exercise context without deleting the detection evidence.

Explanation

Correct Answer

D:

Legitimate test alerts can demonstrate successful control coverage. Classify red-team detection in SOC metrics.

Incorrect Answers

A:

Low volume alone may indicate harmful detection suppression. That is relevant to alert volume and false positives, not to classify red-team detection in SOC metrics.

B:

More alerts can reflect ingestion change rather than attacker activity. It would interpret alert growth after SIEM integration, but it would not classify red-team detection in SOC metrics.

C:

Different observation scope makes raw counts misleading. It could help normalize SOC alert volume across teams, but it would not classify red-team detection in SOC metrics.

Question 997

A cloud vendor claims its infrastructure was unaffected but customer tenant logs show misuse of an app token. Which action BEST aligns with sound security operations?

  1. Distinguish provider infrastructure security from customer identity compromise.
  2. Clarify contractual notification responsibility and obtain legal approval for actual notices.
  3. Establish a shared authorized event chronology with source attribution.
  4. Share scoped relevant logs with approved confidentiality and access controls.

Explanation

Correct Answer

A:

Shared responsibility can yield tenant incidents without provider breach. Classify cloud provider versus tenant incident.

Incorrect Answers

B:

Shared-response ambiguity can cause deadline failures. It could help resolve vendor-customer notification ownership, but it would not classify cloud provider versus tenant incident.

C:

Coordinated timeline reconciles cross-provider evidence while preserving provenance. That is relevant to response communication with external vendors, not to classify cloud provider versus tenant incident.

D:

Third-party assistance does not justify unrestricted evidence disclosure. It would limit incident evidence shared with vendor, but it would not classify cloud provider versus tenant incident.

Question 998

Incident discovery time is uncertain because the initial compromise was months before detection. Which response BEST addresses the security problem described?

  1. Preserve the deadline while validating core facts and coordinating appropriate provisional notice.
  2. Document known detection and discovery milestones without fabricating a first-access date.
  3. Explain the investigation's verified results and evidence gaps without asserting confirmed theft.
  4. Have legal map affected subjects, jurisdictions and trigger dates separately.

Explanation

Correct Answer

B:

Legal reporting clocks may hinge on defined knowledge events rather than guessed intrusion onset. Distinguish discovery time from attack start.

Incorrect Answers

A:

Time pressure does not justify unsupported factual claims. It could help coordinate urgent notification with incomplete evidence, but it would not distinguish discovery time from attack start.

C:

Public confidence requires accurate scope and uncertainty. It would handle unverified customer data theft complaint, but it would not distinguish discovery time from attack start.

D:

Notification timing and content may differ by law and affected population. It could help handle multi-jurisdiction incident reporting, but it would not distinguish discovery time from attack start.

Question 999

A communications team drafts a 'no data accessed' announcement while responders still analyze exfiltration. Which investigative or response action BEST fits the evidence?

  1. Coordinate one approved factual statement and synchronized update cadence.
  2. Provide approved user action guidance and the scope of affected credentials.
  3. Use uncertainty-accurate language reviewed by incident and legal authorities.
  4. Route the request to authorized spokespersons and limit sensitive technical disclosure.

Explanation

Correct Answer

C:

Premature absolutes can be false and damage trust. Avoid premature public assurance during incident.

Incorrect Answers

A:

Consistent messages reduce confusion and unsupported promises. That is relevant to public relations and customer communication, not to avoid premature public assurance during incident.

B:

Actionable communication supports customer risk reduction. It would issue customer security actions after service recovery, but it would not avoid premature public assurance during incident.

D:

Public transparency must be balanced with ongoing defensive security. That is relevant to public relations and customer communication, not to avoid premature public assurance during incident.

Question 1000

A postmortem blames one responder for delays while monitoring coverage and approvals also failed. What is the MOST appropriate analyst action based on the evidence?

  1. Redact or aggregate sensitive details for the approved external audience.
  2. Coordinate updated legal retention rules and evidence-handling controls.
  3. Set owner, deadline, success measure and follow-up test for each action.
  4. Assess systemic process and control factors in a blameless evidence-led review.

Explanation

Correct Answer

D:

Individualized blame obscures defects that can cause repeat incidents. Produce nonpunitive root cause postmortem.

Incorrect Answers

A:

Useful lessons can be shared without exposing affected individuals. It would sanitize external postincident lessons report, but it would not produce nonpunitive root cause postmortem.

B:

Postincident governance findings can outlast initial technical closure. It could help address new evidence retention obligation after incident, but it would not produce nonpunitive root cause postmortem.

C:

Improvements require accountable execution and verification. That is relevant to incident postmortem communication maturity, not to produce nonpunitive root cause postmortem.


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