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CompTIA CS0-003 Practice Test 98

Question 970

A case says the attacker used lateral movement but records only authentication failures. What is the MOST appropriate analyst action based on the evidence?

  1. Reconcile time zones, drift and source event identity before publishing.
  2. Qualify the statement as attempts pending successful access or execution evidence.
  3. Add verified artifact identifiers, affected system and collection context.
  4. Move to controlled evidence storage with custodian metadata and restricted access.

Explanation

Correct Answer

B:

Failed authentication alone does not demonstrate lateral compromise. Avoid unsupported lateral movement claim.

Incorrect Answers

A:

Incorrect time normalization can produce impossible event sequences. It would repair inconsistent incident chronology, but it would not avoid unsupported lateral movement claim.

C:

Reproducible technical evidence supports later validation. That is relevant to technical incident report evidence, not to avoid unsupported lateral movement claim.

D:

Reports should reference preserved artifacts with reliable provenance. It would preserve screenshot evidence traceability, but it would not avoid unsupported lateral movement claim.

Question 971

A support manager emails customers raw internal indicators before legal verifies affected users. Which next step is MOST defensible for the security team?

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

Explanation

Correct Answer

C:

Unfiltered technical disclosures can be inaccurate and expose sensitive infrastructure. Govern premature customer IOC mailing.

Incorrect Answers

A:

Status updates should support decision-making and accountability. It could help report unresolved incident work transparently, but it would not govern premature customer IOC mailing.

B:

Service recovery claims must match actual verification status. That is relevant to communication under investigation pressure, not to govern premature customer IOC mailing.

D:

Response planning must not leak through potentially compromised systems. It could help secure incident command during email compromise, but it would not govern premature customer IOC mailing.

Question 972

A database server is unavailable for 40 minutes but its backups remain intact. Which action BEST aligns with sound security operations?

  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

D:

Downtime does not necessarily imply permanent data loss. Separate outage duration from data-loss scope.

Incorrect Answers

A:

Evidence-specific counts prevent exaggerated victim estimates. That is relevant to incident impact and scope classification, not to separate outage duration from data-loss scope.

B:

Request counts are not equivalent to successful compromise counts. It would distinguish attack attempts from affected users, but it would not separate outage duration from data-loss scope.

C:

Shared infrastructure can broaden the potential blast radius. It could help assess virtualization incident scope, but it would not separate outage duration from data-loss scope.

Question 973

An operations dashboard shows MTTD at two hours but the first malicious event time is missing. Which response BEST addresses the security problem described?

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

Explanation

Correct Answer

A:

Detection-time metrics cannot be precise without a consistent true start. Qualify MTTD when onset unknown.

Incorrect Answers

B:

Raw counts can penalize analysts handling complex incidents. It could help interpret workload metrics fairly, but it would not qualify MTTD when onset unknown.

C:

Operational response time should not be conflated with administrative lifecycle. That is relevant to incident response metric definitions, not to qualify MTTD when onset unknown.

D:

Asynchronous action initiation is not achieved response outcome. It would report true automation containment completion time, but it would not qualify MTTD when onset unknown.

Question 974

A confirmed ransomware process is encrypting a production shared drive but the ticket remains low priority. Which investigative or response action BEST fits the evidence?

  1. Escalate to approved legal and privacy authority and correct the missing decision routing.
  2. Escalate per major-incident criteria and alert response leadership immediately.
  3. Correlate the cases and assign an accountable incident manager.
  4. Apply severity criteria based on confirmed exposure and potential impact.

Explanation

Correct Answer

B:

Active business impact justifies coordinated urgent incident command. Declare major incident for active ransomware.

Incorrect Answers

A:

Statutory triggers require accountable reporting workflows. It could help route incident statutory escalation, but it would not declare major incident for active ransomware.

C:

Coordinated ownership prevents fragmented containment. It would consolidate linked identity incidents under commander, but it would not declare major incident for active ransomware.

D:

Prevention events should not automatically consume major-incident resources. It could help avoid overescalating blocked phish, but it would not declare major incident for active ransomware.

Question 975

The incident team sends a daily status report that omits unresolved high-impact work. What is the MOST appropriate analyst action based on the evidence?

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

Explanation

Correct Answer

C:

Status updates should support decision-making and accountability. Report unresolved incident work transparently.

Incorrect Answers

A:

Service recovery claims must match actual verification status. That is relevant to communication under investigation pressure, not to report unresolved incident work transparently.

B:

Unfiltered technical disclosures can be inaccurate and expose sensitive infrastructure. It would govern premature customer IOC mailing, but it would not report unresolved incident work transparently.

D:

Response planning must not leak through potentially compromised systems. That is relevant to communication under investigation pressure, not to report unresolved incident work transparently.

Question 976

An investigation cannot establish initial access but leadership demands a confident narrative. Which next step is MOST defensible for the security team?

  1. Prioritize lessons and assign verified corrective actions with deadlines.
  2. Validate that control changes or exercises actually address the recorded gaps.
  3. Document contributing technical and process weaknesses beyond the initial click.
  4. State the entry vector as unresolved and list evidence and next steps.

Explanation

Correct Answer

D:

Honest uncertainty preserves credibility and guides investigation. Report unknown initial access without invention.

Incorrect Answers

A:

Recommendations without accountability rarely improve security posture. It would make incident lessons learned actionable, but it would not report unknown initial access without invention.

B:

Participation metrics do not prove reduced security risk. It could help verify lessons learned control outcomes, but it would not report unknown initial access without invention.

C:

Root cause review should expose remediable systemic failures. That is relevant to root cause and lessons learned reporting, not to report unknown initial access without invention.

Question 977

A remediation team closes all incidents after host rebuild but recurring credential compromise continues. Which action BEST aligns with sound security operations?

  1. Track recurrence and residual identity risk in postincident reporting.
  2. Report evidence limitations rather than definitive absence of theft.
  3. Define and test detection or response outcomes for each investment.
  4. Compare activity onset, detection and containment milestones consistently.

Explanation

Correct Answer

A:

One-dimensional closure metrics hide persistent systemic weakness. Report recurring incident root weakness.

Incorrect Answers

B:

Missing historical logs cannot support confident no-exfiltration claims. That is relevant to postincident metrics and review governance, not to report recurring incident root weakness.

C:

Spending activity is not evidence of better security. It would tie incident improvement cost to effectiveness, but it would not report recurring incident root weakness.

D:

Late detection can make apparent post-alert response look fast while impact grows. It could help detect misleading response metric improvement, but it would not report recurring incident root weakness.

Question 978

A CEO receives a forensic log dump but cannot tell which business services are down. Which response BEST addresses the security problem described?

  1. Advise against attribution until independent evidence supports a defensible claim.
  2. Lead with confirmed business impact, affected services, containment status and decisions needed.
  3. Add an evidence-backed timeline with major decisions and residual gaps.
  4. State confirmed exposure and unresolved exfiltration investigation separately.

Explanation

Correct Answer

B:

Executives need an actionable summary rather than raw telemetry. Deliver business-focused incident executive summary.

Incorrect Answers

A:

IP infrastructure location does not identify a perpetrator. That is relevant to executive incident briefing, not to deliver business-focused incident executive summary.

C:

Incident progression allows leaders to evaluate response effectiveness. It could help summarize incident timeline accurately, but it would not deliver business-focused incident executive summary.

D:

An accurate briefing distinguishes potential harm from verified data loss. That is relevant to executive incident briefing, not to deliver business-focused incident executive summary.

Question 979

An organization operates in several jurisdictions with different breach notification deadlines. Which investigative or response action BEST fits the evidence?

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

Explanation

Correct Answer

C:

Notification timing and content may differ by law and affected population. Handle multi-jurisdiction incident reporting.

Incorrect Answers

A:

Public confidence requires accurate scope and uncertainty. It would handle unverified customer data theft complaint, but it would not handle multi-jurisdiction incident reporting.

B:

Legal reporting clocks may hinge on defined knowledge events rather than guessed intrusion onset. It could help distinguish discovery time from attack start, but it would not handle multi-jurisdiction incident reporting.

D:

Time pressure does not justify unsupported factual claims. It would coordinate urgent notification with incomplete evidence, but it would not handle multi-jurisdiction incident reporting.

Question 980

An incident report calls a phishing attachment a ransomware infection although no file encrypted. What is the MOST appropriate analyst action based on the evidence?

  1. Provide a qualitative supported confidence assessment with source and limitations.
  2. Report confirmed access and explicitly withhold unverified actor attribution.
  3. Explain attribution uncertainty and compare independent behavior indicators.
  4. Describe confirmed execution stage and observed effects only.

Explanation

Correct Answer

D:

Incident labels should not outrun forensic proof. Avoid unsupported ransomware impact claim.

Incorrect Answers

A:

Pseudoprecise confidence numbers are misleading without calibration. It could help report calibrated attribution uncertainty, but it would not avoid unsupported ransomware impact claim.

B:

Impact evidence and attribution confidence are separate questions. That is relevant to confidence and threat actor communication, not to avoid unsupported ransomware impact claim.

C:

Shared cloud infrastructure does not uniquely link intrusions. It would communicate cloud shared-IP attribution limits, but it would not avoid unsupported ransomware impact claim.


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