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CompTIA CS0-003 Practice Test 81

Question 800

A new on-call responder has never practiced compromised-service isolation procedures. What is the MOST appropriate analyst action based on the evidence?

  1. Exercise legal, privacy and executive communication responsibilities together.
  2. Conduct joint evidence briefings and use an approved publication review process.
  3. Validate secure evidence intake and transfer during onboarding exercises.
  4. Provide hands-on exercises with safe simulator systems and escalation coaching.

Explanation

Correct Answer

D:

Practiced actions reduce delays and errors during real containment. Train endpoint containment before duty.

Incorrect Answers

A:

Decision makers need role-specific preparation, not only SOC technical training. It could help train executive breach notification response, but it would not train endpoint containment before duty.

B:

External accuracy depends on shared technical confidence boundaries. That is relevant to training for incident roles, not to train endpoint containment before duty.

C:

Repository handling is part of forensic chain-of-custody readiness. It would train encrypted evidence repository procedure, but it would not train endpoint containment before duty.

Question 801

An organization publishes lessons learned but never tests whether a new playbook works. Which next step is MOST defensible for the security team?

  1. Validate improvements through follow-up exercises and targeted technical tests.
  2. Add a central timestamped response decision log to the playbook.
  3. Assign a telemetry owner, deadline and verification criterion to the improvement.
  4. Address remediation governance and recurring technical debt across the program.

Explanation

Correct Answer

A:

Written changes do not prove operational effectiveness. Verify postincident improvement in exercise.

Incorrect Answers

B:

Incident decisions require traceable authorization and handoffs. It would fix missing incident decision journal, but it would not verify postincident improvement in exercise.

C:

Lessons only reduce future risk when converted into accountable work. It could help operationalize detection coverage lesson, but it would not verify postincident improvement in exercise.

D:

Pattern analysis reveals systemic causes across individual incident records. That is relevant to postincident lessons learned, not to verify postincident improvement in exercise.

Question 802

An outsourced SOC sees customer incidents but lacks a secure way to contact internal responders. Which action BEST aligns with sound security operations?

  1. Provision approved emergency vault access and prohibit secret sharing.
  2. Test authenticated communication and emergency escalation between provider and organization.
  3. Establish an out-of-band secure communications plan and exercise it.
  4. Assign notification decision owner and required timing checkpoints.

Explanation

Correct Answer

B:

Response coordination fails when channels are missing or compromised. Test outsourced SOC communication route.

Incorrect Answers

A:

Incident urgency does not justify exposing high-value credentials. It would secure emergency access during incident response, but it would not test outsourced SOC communication route.

C:

Compromised communications can leak response strategy to attackers. That is relevant to communication and coordination preparedness, not to test outsourced SOC communication route.

D:

Regulatory deadlines need explicit accountable workflow. It would establish breach regulator-notification ownership, but it would not test outsourced SOC communication route.

Question 803

A backup recovery process restores old vulnerable web-server packages after a breach. Which response BEST addresses the security problem described?

  1. Obtain business validation against agreed transactions and recovery criteria.
  2. Maintain controlled hold until critical integrity and access checks pass.
  3. Patch and harden the restored workload before reconnecting to production.
  4. Make security logging part of recovery acceptance conditions.

Explanation

Correct Answer

C:

Recovery must not reinstate the exploit that caused the incident. Secure recovered service before reconnect.

Incorrect Answers

A:

A service can appear healthy while failing its intended business function. It could help require business owner recovery acceptance, but it would not secure recovered service before reconnect.

B:

Fast availability without integrity can extend incident harm. That is relevant to coordination with business recovery, not to secure recovered service before reconnect.

D:

Restored operations need ongoing detection capability. It could help enforce monitoring in disaster recovery acceptance, but it would not secure recovered service before reconnect.

Question 804

A forensic examiner joins a case but has never used the organization's encrypted evidence repository. Which investigative or response action BEST fits the evidence?

  1. Exercise legal, privacy and executive communication responsibilities together.
  2. Provide hands-on exercises with safe simulator systems and escalation coaching.
  3. Conduct joint evidence briefings and use an approved publication review process.
  4. Validate secure evidence intake and transfer during onboarding exercises.

Explanation

Correct Answer

D:

Repository handling is part of forensic chain-of-custody readiness. Train encrypted evidence repository procedure.

Incorrect Answers

A:

Decision makers need role-specific preparation, not only SOC technical training. That is relevant to training for incident roles, not to train encrypted evidence repository procedure.

B:

Practiced actions reduce delays and errors during real containment. It would train endpoint containment before duty, but it would not train encrypted evidence repository procedure.

C:

External accuracy depends on shared technical confidence boundaries. It could help train incident communications evidence handling, but it would not train encrypted evidence repository procedure.

Question 805

A plan assigns the same person to evidence acquisition and external public statements. What is the MOST appropriate analyst action based on the evidence?

  1. Separate technical evidence duties from approved communications authority.
  2. Establish severity thresholds and notification paths tied to business impact.
  3. Assign accountable incident command and business-impact approval roles.
  4. Maintain tested on-call routing and backup contacts in the response plan.

Explanation

Correct Answer

A:

Specialized roles improve accuracy and reduce unauthorized disclosure. Segregate response evidence and public communication roles.

Incorrect Answers

B:

Consistent declaration criteria prevent delayed or excessive escalation. It could help standardize major incident declaration threshold, but it would not segregate response evidence and public communication roles.

C:

Disruptive containment requires clear decision authority before an emergency. That is relevant to ir plan roles and escalation, not to segregate response evidence and public communication roles.

D:

Time-critical response depends on contact availability beyond business hours. It would create resilient after-hours IR call tree, but it would not segregate response evidence and public communication roles.

Question 806

A major incident compromises corporate email, the only channel used by the response team. Which next step is MOST defensible for the security team?

  1. Test authenticated communication and emergency escalation between provider and organization.
  2. Establish an out-of-band secure communications plan and exercise it.
  3. Provision approved emergency vault access and prohibit secret sharing.
  4. Assign notification decision owner and required timing checkpoints.

Explanation

Correct Answer

B:

Compromised communications can leak response strategy to attackers. Prepare alternate incident command channel.

Incorrect Answers

A:

Response coordination fails when channels are missing or compromised. It could help test outsourced SOC communication route, but it would not prepare alternate incident command channel.

C:

Incident urgency does not justify exposing high-value credentials. It would secure emergency access during incident response, but it would not prepare alternate incident command channel.

D:

Regulatory deadlines need explicit accountable workflow. It could help establish breach regulator-notification ownership, but it would not prepare alternate incident command channel.

Question 807

A cyber recovery plan restores servers but not the firewall policy needed to isolate them. Which action BEST aligns with sound security operations?

  1. Include identity and authentication dependencies in the impact analysis.
  2. Revise capability or recovery strategy to meet agreed recovery objectives.
  3. Include trusted network configuration and security-control recovery dependencies.
  4. Improve backup frequency or replication to satisfy required data-loss tolerance.

Explanation

Correct Answer

C:

Recovered workloads should not return without necessary protective controls. Restore security controls in disaster recovery.

Incorrect Answers

A:

Services cannot recover if their external identity dependencies remain unavailable. That is relevant to business continuity and disaster recovery, not to restore security controls in disaster recovery.

B:

Recovery-time promises must reflect demonstrated operational capability. It would close RTO versus restore capability gap, but it would not restore security controls in disaster recovery.

D:

RPO governs acceptable data age, not simply service availability. That is relevant to business continuity and disaster recovery, not to restore security controls in disaster recovery.

Question 808

An incident report treats all unproven hypotheses as confirmed attack stages. Which response BEST addresses the security problem described?

  1. Validate available source copies and document integrity uncertainty before reliance.
  2. Reconstruct permissible chain-of-custody documentation and disclose gaps.
  3. Apply documented retention and legal hold rules before authorized disposal.
  4. Separate observed evidence from inference and list confidence or limitations.

Explanation

Correct Answer

D:

Honest provenance supports defensible technical and legal conclusions. Qualify uncertain postincident findings.

Incorrect Answers

A:

Evidentiary conclusions depend on collection and transfer integrity. It would resolve forensic evidence provenance gap, but it would not qualify uncertain postincident findings.

B:

Missing custody details cannot be hidden by later hashes. It could help acknowledge missing evidence custody history, but it would not qualify uncertain postincident findings.

C:

Restoring systems does not necessarily end evidence preservation obligations. That is relevant to forensics and evidence after incidents, not to qualify uncertain postincident findings.

Question 809

A SOAR playbook blocks domains based solely on one unverified low-confidence alert. Which investigative or response action BEST fits the evidence?

  1. Add evidence and approval thresholds for disruptive enforcement actions.
  2. Add token/session revocation and verify access invalidation steps.
  3. Define retention, custody and legal hold pathways with policy owners.
  4. Update and test the workflow against deployed tooling before declaring it ready.

Explanation

Correct Answer

A:

Automated containment must match the confidence and risk of detection. Constrain SOAR action trigger in playbook.

Incorrect Answers

B:

Password resets alone may leave stolen sessions active. That is relevant to playbook lifecycle and validation, not to constrain SOAR action trigger in playbook.

C:

Evidence preservation requirements continue after immediate technical response. It would include postincident evidence retention in playbook, but it would not constrain SOAR action trigger in playbook.

D:

Playbooks become unsafe when tooling or APIs change. It could help validate playbook against current EDR version, but it would not constrain SOAR action trigger in playbook.

Question 810

A SOC reports faster detection but calculates only cases that were escalated to responders. What is the MOST appropriate analyst action based on the evidence?

  1. Measure verified recovery/eradication milestones rather than administrative closure.
  2. Define detection-time metrics across all eligible incidents consistently.
  3. Update the impact report with time-stamped revised estimates and evidence.
  4. Normalize scenario complexity and decision criteria before trend comparison.

Explanation

Correct Answer

B:

Selection bias can make process improvement look better than reality. Avoid biased incident detection metrics.

Incorrect Answers

A:

Correct outcome measurement prevents premature success reporting. That is relevant to after-action metric improvement, not to avoid biased incident detection metrics.

C:

Incident impact assessment may evolve as downstream losses become known. It could help revise incident impact after later reconciliation, but it would not avoid biased incident detection metrics.

D:

Exercise metrics require comparable conditions for meaningful conclusions. That is relevant to after-action metric improvement, not to avoid biased incident detection metrics.


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