Question 1100
The affected workflow needs an integrity and access check following this event: A SCADA historian stops receiving data after a new firewall block was installed during a suspected intrusion. What case-specific cleanup or recovery step establishes a trusted state?
- Validate historian ingestion and independent process alarm visibility
- Restore approved setpoints and verify process stability with authorized operators
- Document essential OT data flows and rehearse containment ACLs
- Adjust the rule with OT owner approval to preserve required read-only flows
Explanation
Correct Answer
A:Recovery should confirm trustworthy monitoring has resumed; the resulting state needs verification against the original concern: whether containment interrupted process monitoring.
Incorrect Answers
B:Recovery needs physical-state validation beyond software scans; the activity targets whether physical process safety is at risk; trusted restoration here concerns whether containment interrupted process monitoring.
C:Prevalidated rules reduce accidental outages; the case needs trusted restoration addressing whether containment interrupted process monitoring; future hardening is not current-state recovery.
D:Narrow enforcement can limit malicious traffic without blinding operators; when judging whether containment interrupted process monitoring, temporary protection does not complete correction; this is instead initial containment or preservation.
Question 1101
During lessons learned, the security owner reviews this completed incident: An industrial HMI shows unauthorized setpoint changes while the process is operating near a safety threshold. Which repeatable safeguard best prevents this failure mode in the future?
- Correlate HMI commands, controller events and process telemetry with OT operators
- Allowlist engineering workstations and monitor PLC program changes
- Restore approved setpoints and verify process stability with authorized operators
- Use change approval, role segregation and process anomaly detection
Explanation
Correct Answer
D:Safety-aware controls detect unauthorized setpoint modifications; it closes a repeatable gap revealed by whether physical process safety is at risk without removing useful monitoring.
Incorrect Answers
A:Cyber observations must be interpreted against real equipment conditions; the case needs recurrence prevention addressing whether physical process safety is at risk; an investigation is not recurrence prevention.
B:Separated roles reduce unauthorized logic updates; this serves whether a nonengineering station initiated controller changes, whereas the requested result is recurrence prevention involving whether physical process safety is at risk.
C:Recovery needs physical-state validation beyond software scans; for whether physical process safety is at risk, case recovery is not future-risk control; recurrence prevention remains necessary.
Question 1102
Cleanup is not considered complete. The case record describes: A plant engineer proposes rebooting a suspected compromised controller during an active batch process. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Build incident runbooks around process hazards and safe shutdown windows
- Rotate vendor credentials and inspect changes made during the session
- Use plant-approved protective actions before any controller power change
- Schedule verified firmware or logic restoration during an authorized safe state
Explanation
Correct Answer
D:OT recovery should not bypass maintenance interlocks; the recovery decision is tied to whether reboot is operationally safe, not merely to reduced alert volume.
Incorrect Answers
A:Preparation prevents unsafe response actions; the requirement concerns whether reboot is operationally safe, so future hardening is not current-state recovery.
B:Recovery includes process configuration and identity review; the activity targets whether vendor remote access was misused; trusted restoration here concerns whether reboot is operationally safe.
C:Physical safety and continuity determine acceptable containment; temporary protection does not complete correction in the decision about whether reboot is operationally safe.
Question 1103
The responder must establish the timeline from this observation: A mobile phishing page successfully captures a corporate sign-in and the attacker maintains an active cloud session. Which analysis step best addresses the missing confirmation?
- Correlate mobile browser events with identity provider sign-in and token activity
- Inspect app source, granted accessibility permissions and notification access
- Use phishing-resistant MFA and mobile threat protection
- Revoke the account's suspicious sessions and block the lure
Explanation
Correct Answer
A:The compromised credential may have been replayed from a different device; for this investigation, the relevant uncertainty is whether mobile-origin credentials were used elsewhere, so independent confirmation matters.
Incorrect Answers
B:Excessive privileges can enable sensitive content capture without conventional malware files; it is meant to address whether abuse of accessibility services is occurring, not evidence validation for whether mobile-origin credentials were used elsewhere.
C:Origin-bound authentication reduces mobile phishing impact; for whether mobile-origin credentials were used elsewhere, prevention is not incident verification; evidence validation remains necessary.
D:Cloud-side identity containment can work even if the phone is offline; the requirement concerns whether mobile-origin credentials were used elsewhere, so immediate protection does not substantiate findings.
Question 1104
A technical closure review begins after this incident: A desktop triggers a false positive on a signed internal updater after a new security policy rollout. An incident plan must include factual validation, narrowly scoped protection, and trusted remediation—not only prevention. Which THREE actions cover those stages? (Choose THREE.)
- Maintain signed package inventory and change-aware endpoint detections
- Maintain release-aware allowlisting with expiration and review
- Check signer, release manifest, deployment schedule and process actions
- Tune the specific rule and document tested expected execution
- Use a narrow temporary exception only after validating the updater
- Use controlled-folder protections and immutable backup copies
Explanation
Correct Answers
C:Authenticity and expected behavior can support a false-positive conclusion; within the combined response for whether the alert is a benign software change, this supplies evidence validation: this evidence is scoped to whether the alert is a benign software change, not a generic system-health reading.
D:Recovery restores normal updates without sacrificing coverage; within the combined response for whether the alert is a benign software change, this supplies trusted restoration: the affected workflow should not be considered trusted until the issue of whether the alert is a benign software change is resolved.
E:Broad antivirus disablement would create unnecessary exposure; within the combined response for whether the alert is a benign software change, this supplies initial containment or preservation: it restricts the path implicated in whether the alert is a benign software change; later eradication and restoration remain separate decisions.
Incorrect Answers
A:Context reduces incorrect persistence alerts; the relevant condition for that step is whether the service change is authorized, which is not shown for whether the alert is a benign software change.
B:Controlled exception lifecycles reduce recurring alerts; for whether the alert is a benign software change, future hardening is not current-state recovery; trusted restoration remains necessary.
F:Write restrictions and protected recovery points reduce impact; it is meant to address whether ransomware encryption has begun, not trusted restoration for whether the alert is a benign software change.
Question 1105
For the next control cycle, the responder supplies this incident history: An employee laptop reports hundreds of file-renaming operations and rapid changes to document entropy. Which ongoing safeguard should be implemented and tested?
- Enable DNS and endpoint behavioral correlation
- Suspend the responsible process and isolate the laptop from file shares
- Rebuild the endpoint and restore affected files from validated backups
- Use controlled-folder protections and immutable backup copies
- Correlate file-modification bursts with originating process and user account
Explanation
Correct Answer
D:Write restrictions and protected recovery points reduce impact; it makes the lesson about whether ransomware encryption has begun part of normal operations.
Incorrect Answers
A:Layered telemetry covers gaps in signature detections; the relevant condition for that step is whether a negative signature alert rules out compromise, which is not shown for whether ransomware encryption has begun.
B:Stopping writes limits immediate file damage and propagation; for whether ransomware encryption has begun, one-time protection is not durable prevention; recurrence prevention remains necessary.
C:Reliable recovery avoids trusting altered local content; the requirement concerns whether ransomware encryption has begun, so case recovery is not future-risk control.
E:Bulk rewrites and entropy shifts are consistent with encryption activity; an investigation is not recurrence prevention in the decision about whether ransomware encryption has begun.
Question 1106
During lessons learned, the security owner reviews this completed incident: A network camera still uses a default administrator password and exposes its control interface to the internet. Which repeatable safeguard best prevents this failure mode in the future?
- Require secure-by-default device commissioning checklists
- Review camera authentication logs, firmware and management interface exposure
- Enforce unique device credentials and isolated management networks
- Upgrade supported firmware and validate camera configuration after compromise review
Explanation
Correct Answer
C:IoT devices should not depend on factory defaults; this turns the weakness behind whether weak device identity enabled unauthorized access into a measurable prevention requirement.
Incorrect Answers
A:Hardening at install time prevents dormant weaknesses; that method could help with whether an unnecessary remote service exposes device control; the recurrence prevention decision here involves whether weak device identity enabled unauthorized access.
B:Default credentials plus public reachability create a straightforward entry path; when judging whether weak device identity enabled unauthorized access, an investigation is not recurrence prevention; this is instead evidence validation.
D:Recovery must address both access and possible persistent settings; the requirement concerns whether weak device identity enabled unauthorized access, so case recovery is not future-risk control.
Question 1107
The team has retained the initial evidence and is assessing recovery from: Endpoint event logs are overwritten after a few hours because an application generates noisy debug events. What restoration task closes the identified integrity or control gap?
- Include event-retention performance tests in endpoint baselines
- Collect evidence through vendor-approved interfaces and validate control functionality
- Prioritize export of security-critical events to central storage
- Tune debug verbosity and verify investigation events remain available
Explanation
Correct Answer
D:A balanced configuration preserves high-value evidence; the resulting state needs verification against the original concern: whether security telemetry capacity is adequate.
Incorrect Answers
A:Capacity planning improves forensic readiness; the goal is trusted restoration for whether security telemetry capacity is adequate. Future hardening is not current-state recovery.
B:Supported methods preserve reliability while investigating; it is meant to address whether the equipment vendor approves the proposed scanner for this controller, not trusted restoration for whether security telemetry capacity is adequate.
C:Protected off-device logs survive local overwrite; the case needs trusted restoration addressing whether security telemetry capacity is adequate; temporary protection does not complete correction.
Question 1108
A case is escalated for independent verification after this finding: A field workstation is disconnected from the corporate network for weeks, so its EDR agent receives no policies or updates. What collection or comparison would validate the reported condition?
- Use offline-capable controls and reconnect compliance checks
- Limit access to high-value services until the device synchronizes and is assessed
- Map device identity, installed apps and data access from the alerted mobile client
- Inspect last agent heartbeat, definition updates and local event buffer
Explanation
Correct Answer
D:Offline operation can create long monitoring and protection gaps; it makes the determination of whether intermittent devices retain protective coverage defensible and reviewable by the incident owner.
Incorrect Answers
A:Remote endpoints need protection between central connections; prevention is not incident verification in the decision about whether intermittent devices retain protective coverage.
B:A trust gate prevents stale endpoints from rejoining blindly; the case needs evidence validation addressing whether intermittent devices retain protective coverage; immediate protection does not substantiate findings.
C:Compromised endpoints can expose cloud sessions and enterprise data without compromising servers; it is meant to address whether endpoints can bypass server-centric protection, not evidence validation for whether intermittent devices retain protective coverage.
Question 1109
The team needs temporary protection and must retain evidence. The observed event is: A managed Android phone is rooted, causing device-attestation checks to fail during corporate access. Investigators need both a defensible factual finding and a limited immediate safeguard. Which TWO actions jointly satisfy those requirements? (Choose TWO.)
- Enforce managed developer-setting restrictions on high-risk devices
- Block access from the noncompliant device through conditional policy
- Require device integrity attestation for sensitive mobile access
- Reprovision on a verified supported device and review exposed sessions
- Review device integrity attestation, MDM compliance and enrollment state
Explanation
Correct Answers
B:Identity gating reduces risk without treating an attestation result as proof of a specific exploit; within the combined response for whether platform integrity meets access policy, this supplies initial containment or preservation: this is a first-response safeguard for whether platform integrity meets access policy, not a substitute for full root-cause analysis.
E:Rooting can change the trust assumptions behind managed endpoint protections; within the combined response for whether platform integrity meets access policy, this supplies evidence validation: it makes the determination of whether platform integrity meets access policy defensible and reviewable by the incident owner.
Incorrect Answers
A:Policy limits unauthorized debugging connections; the activity targets whether debugging exposes the managed device; initial containment or preservation here concerns whether platform integrity meets access policy.
C:Conditional access limits compromised or unmanaged platforms; for whether platform integrity meets access policy, prevention cannot replace immediate action; initial containment or preservation remains necessary.
D:Trust restoration requires an approved system state; the requirement concerns whether platform integrity meets access policy, so corrective follow-through follows initial protection.
Question 1110
An evidence-led review starts with the following report: A smart thermostat gateway sends traffic to an unknown cloud endpoint after an unapproved firmware update. What investigation should establish the disputed activity and its timeline?
- Compare firmware version and signature with vendor release records and flow logs
- Correlate gateway crash logs, source flows and management parser errors
- Require signed firmware and approved update management for IoT assets
- Restrict the gateway's outbound paths without interrupting essential building control
Explanation
Correct Answer
A:An unexpected firmware build can change device behavior and external communication; the objective is to establish whether firmware integrity or destination was altered; the result can then guide the later protective decision.
Incorrect Answers
B:Timing and input patterns can link traffic to service instability; this serves whether malicious management requests cause availability loss, whereas the requested result is evidence validation involving whether firmware integrity or destination was altered.
C:Firmware provenance reduces supply-chain and unauthorized changes; the requirement concerns whether firmware integrity or destination was altered, so prevention is not incident verification.
D:Network containment protects safety and availability; the goal is evidence validation for whether firmware integrity or destination was altered. Immediate protection does not substantiate findings.