Question 660
During lessons learned, the security owner reviews this completed incident: A wireless security survey detects an access point advertising the approved SSID from a location outside the building. Which repeatable safeguard best prevents this failure mode in the future?
- Compare BSSID, hardware inventory and measured signal location
- Remove confirmed unauthorized equipment and review any associated clients
- Maintain wireless intrusion detection and approved AP inventories
- Enforce validated enterprise WLAN certificates and managed network profiles
Explanation
Correct Answer
C:Continuous comparison detects new unauthorized radios; the assurance measure is designed around whether the radio is authorized infrastructure, rather than hiding the reported activity.
Incorrect Answers
A:SSID names are not proof of asset ownership; the case needs recurrence prevention addressing whether the radio is authorized infrastructure; an investigation is not recurrence prevention.
B:A rogue device may have captured traffic or credentials; when judging whether the radio is authorized infrastructure, case recovery is not future-risk control; this is instead trusted restoration.
D:Client authentication helps prevent evil-twin connections; this serves whether an evil twin access point is impersonating the SSID, whereas the requested result is recurrence prevention involving whether the radio is authorized infrastructure.
Question 661
A triage analyst needs to test a report involving these details: A DNS resolver runs out of worker capacity under a burst of expensive recursive requests. Which evidence collection or correlation is most relevant to this claim?
- Do not expose unrestricted recursion and monitor resolver capacity
- Restrict recursion to approved clients and apply query-rate controls
- Correlate endpoint latency, query cost, authenticated caller and request frequency
- Correlate recursion queue, response latency and requester distribution
Explanation
Correct Answer
D:Large recursion work can degrade DNS even if interface bandwidth is not full; for this investigation, the relevant uncertainty is whether resolver resource exhaustion is the outage cause, so independent confirmation matters.
Incorrect Answers
A:Baseline protections reduce abuse as an amplifier or target; the goal is evidence validation for whether resolver resource exhaustion is the outage cause. Prevention is not incident verification.
B:Narrowing who can request expensive recursion reduces immediate demand; immediate protection does not substantiate findings in the decision about whether resolver resource exhaustion is the outage cause.
C:Low-volume requests can exhaust CPU or database resources without a volumetric flood; it is meant to address whether application-layer resource exhaustion is responsible, not evidence validation for whether resolver resource exhaustion is the outage cause.
Question 662
To avoid broad unnecessary disruption, responders consider this finding: An IDS flags SQL injection signatures in encrypted traffic but the only visible artifact is TLS metadata. Which operational control should take effect first?
- Request authorized application-layer logs before taking destructive action
- Check sensor decryption capabilities and available HTTP transaction logs
- Block the specific unauthorized upload destination or path at the appropriate proxy
- Correlate requests and application errors to determine real impact
Explanation
Correct Answer
A:Additional evidence validates the claimed payload and its effect; the protective decision should be recorded and its effect tested against whether the alert was based on decrypted application content.
Incorrect Answers
B:Encrypted packets alone do not reveal plaintext request parameters to a passive sensor; investigation alone does not control current conditions in the decision about whether the alert was based on decrypted application content.
C:Fine-grained filtering avoids disrupting the entire CDN; the activity targets whether trusted hosting masks unauthorized upload; initial containment or preservation here concerns whether the alert was based on decrypted application content.
D:A detection signature should be tied to backend behavior; when judging whether the alert was based on decrypted application content, corrective follow-through follows initial protection; this is instead post-containment assessment.
Question 663
The team wants a measurable hardening change following this situation: An attacker spoofs a victim address in UDP queries to exposed reflection services, causing amplified replies to the victim. What improvement best addresses the root weakness in a future incident?
- Inspect reply traffic patterns, protocol types and reflection source distribution
- Contract upstream DDoS response and exercise traffic diversion
- Restore routing and investigate exposed reflection services in the environment
- Harden UDP services against reflection and use source-address anti-spoofing
Explanation
Correct Answer
D:Ingress and egress validation reduce spoofed-packet abuse; it makes the lesson about whether amplification rather than direct requests caused the flood part of normal operations.
Incorrect Answers
A:Many replies from unrelated servers toward one victim suggest reflection abuse; the requirement concerns whether amplification rather than direct requests caused the flood, so an investigation is not recurrence prevention.
B:Preparation matters when local controls cannot see all attack packets; the relevant condition for that step is where traffic must be filtered to restore availability, which is not shown for whether amplification rather than direct requests caused the flood.
C:Reducing local amplifiers helps prevent participation in future attacks; case recovery is not future-risk control in the decision about whether amplification rather than direct requests caused the flood.
Question 664
Cleanup is not considered complete. The case record describes: Traffic engineers see rising HTTP 429 responses after enabling emergency rate limiting on a public service. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Baseline client demand and test throttling before incidents
- Correlate 429 rates, client identity and completed legitimate transactions
- Optimize expensive queries and confirm capacity after controls apply
- Refine rate limits with authenticated-user and path context
- Test legitimate workflows and adjust burst handling after the attack
Explanation
Correct Answer
E:Recovery must validate end-user functionality as well as traffic volume; technical closure should demonstrate that the control gap behind whether mitigation is blocking legitimate clients is actually corrected.
Incorrect Answers
A:Well-calibrated controls reduce collateral denial of service; the requirement concerns whether mitigation is blocking legitimate clients, so future hardening is not current-state recovery.
B:Excessive throttling can become a self-inflicted availability issue; the goal is trusted restoration for whether mitigation is blocking legitimate clients. Verification is not the corrective step.
C:A sustainable fix addresses resource amplification; this serves whether application-layer resource exhaustion is responsible, whereas the requested result is trusted restoration involving whether mitigation is blocking legitimate clients.
D:Targeted thresholds protect service capacity without unfairly blocking users; the case needs trusted restoration addressing whether mitigation is blocking legitimate clients; temporary protection does not complete correction.
Question 665
A containment decision is required for this incident: A service remains unavailable after malicious traffic stops because a gateway's session table is still exhausted. What action constrains the incident at the affected point of control?
- Expire abusive state entries through approved controls without dropping all production sessions
- Verify normal new connections and tune session timeouts appropriately
- Refine rate limits with authenticated-user and path context
- Measure current session-table usage and compare with live traffic volume
Explanation
Correct Answer
A:Selective cleanup can recover capacity while limiting disruption; the immediate response addresses whether stale state prevents recovery while the team preserves relevant case records.
Incorrect Answers
B:Restoration depends on state resources, not just stopping packets; the case needs initial containment or preservation addressing whether stale state prevents recovery; corrective follow-through follows initial protection.
C:Targeted thresholds protect service capacity without unfairly blocking users; that method could help with whether mitigation is blocking legitimate clients; the initial containment or preservation decision here involves whether stale state prevents recovery.
D:Residual device state can sustain an outage after the attack source subsides; for whether stale state prevents recovery, investigation alone does not control current conditions; initial containment or preservation remains necessary.
Question 666
While full remediation remains pending, the commander receives this incident report: A research lab's network is used to run unauthorized cryptomining over an allowed outbound port. Which first protective measure directly limits the situation without assuming cleanup is finished?
- Stop unauthorized outbound SMTP from the host and isolate it
- Correlate flow destinations, host processes and workload approvals
- Remove mining software and inspect for credential theft or persistence
- Terminate unauthorized mining communications and notify system ownership
- Use egress controls and workload accounting alerts on shared compute systems
Explanation
Correct Answer
D:Stopping abuse reduces resource and reputation impact; the protective decision should be recorded and its effect tested against whether resource consumption is policy abuse or sanctioned computation.
Incorrect Answers
A:Network containment protects domain reputation and limits distribution; that method could help with whether host misuse is causing outbound abuse; the initial containment or preservation decision here involves whether resource consumption is policy abuse or sanctioned computation.
B:Port number alone cannot establish whether compute activity is legitimate; when judging whether resource consumption is policy abuse or sanctioned computation, investigation alone does not control current conditions; this is instead evidence validation.
C:Unexpected mining may be a symptom of broader compromise; for whether resource consumption is policy abuse or sanctioned computation, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
E:Visibility reduces hidden misuse; the goal is initial containment or preservation for whether resource consumption is policy abuse or sanctioned computation. Prevention cannot replace immediate action.
Question 667
Post-containment analysis identified this issue for correction: Employees report a wireless network with the company name but a different certificate prompt near reception. Which remediation is supported by the observed root-cause conditions?
- Warn users and coordinate wireless containment under authorized procedures
- Locate and remove the rogue device and assess exposed credentials
- Remove confirmed unauthorized equipment and review any associated clients
- Enforce validated enterprise WLAN certificates and managed network profiles
Explanation
Correct Answer
B:A spoofed WLAN can lead to stolen authentication data; the change should be tested before unrestricted operations resume for the event involving whether an evil twin access point is impersonating the SSID.
Incorrect Answers
A:Avoid indiscriminate jamming while protecting clients from the fake network; for whether an evil twin access point is impersonating the SSID, temporary protection does not complete correction; trusted restoration remains necessary.
C:A rogue device may have captured traffic or credentials; the other incident centers on whether the radio is authorized infrastructure, not this trusted restoration question about whether an evil twin access point is impersonating the SSID.
D:Client authentication helps prevent evil-twin connections; future hardening is not current-state recovery in the decision about whether an evil twin access point is impersonating the SSID.
Question 668
Before granting routine access again, the team reviews this case: Incident handlers lack an approved method to isolate network devices that manage safety-critical building controls. What must the response owner validate as part of safe recovery?
- Update containment diagrams and perform an end-to-end blocking test
- Coordinate with facilities before applying a narrow containment ACL
- Validate alternate management access and normal control flows before restoration
- Document and rehearse isolation tiers for critical infrastructure networks
Explanation
Correct Answer
C:Recovery must verify the safety system remains functional; the recovery decision is tied to whether segmentation plans protect critical operational dependencies, not merely to reduced alert volume.
Incorrect Answers
A:A verified rule should take effect where intended; it is meant to address whether emergency network enforcement points are current, not trusted restoration for whether segmentation plans protect critical operational dependencies.
B:Risk-aware enforcement protects essential operation while limiting attacker reach; for whether segmentation plans protect critical operational dependencies, temporary protection does not complete correction; trusted restoration remains necessary.
D:Preplanned boundaries reduce dangerous improvisation; the goal is trusted restoration for whether segmentation plans protect critical operational dependencies. Future hardening is not current-state recovery.
Question 669
Forensic review begins with this reported event: A firewall rule permits inbound management traffic from any internet address after an emergency deployment. Which evidence-based task answers the primary uncertainty?
- Restrict management access to approved jump hosts or private networks
- Correlate SSH process arguments with firewall flows and local listening ports
- Revert the excessive rule and review administrative sessions during exposure
- Require peer-reviewed policy-as-code checks for management ingress
- Review rule hit logs, deployment diff and management-plane listening interfaces
Explanation
Correct Answer
E:A broad source range can expose administrative services beyond intended operators; that evidence directly tests the concern about which configuration allowed unauthorized administrative reachability, rather than relying on a single unverified indicator.
Incorrect Answers
A:Source constraints reduce internet attack surface immediately; for which configuration allowed unauthorized administrative reachability, immediate protection does not substantiate findings; evidence validation remains necessary.
B:A reverse tunnel can expose internal services through an outbound connection; the other incident centers on whether outbound encrypted traffic enables inbound control, not this evidence validation question about which configuration allowed unauthorized administrative reachability.
C:Recovery checks whether anyone exploited the open access path; the goal is evidence validation for which configuration allowed unauthorized administrative reachability. Recovery is not factual verification.
D:Preventive validation catches broad administrator access rules; prevention is not incident verification in the decision about which configuration allowed unauthorized administrative reachability.
Question 670
The coordinator needs corrective action rather than another alert. The event was: A user operates an unapproved remote desktop relay over HTTPS, bypassing the organization's remote access gateway. Which follow-through step verifies the weakness was removed?
- Revoke the relay's access and restrict unauthorized remote-control clients
- Remove the tunnel client and review affected access and policy violations
- Inspect proxy destinations, executable signatures and active remote sessions
- Use application-aware proxy policies and allowlisted remote support tools
- Remove rogue client persistence and review accessed resources and credentials
Explanation
Correct Answer
E:Cleanup must account for what remote operators may have done; the affected workflow should not be considered trusted until the issue of whether tunneled remote administration violates access policy is resolved.
Incorrect Answers
A:Containment restores the sanctioned management boundary; when judging whether tunneled remote administration violates access policy, temporary protection does not complete correction; this is instead initial containment or preservation.
B:Response should determine whether sensitive data crossed the alternate channel; the relevant condition for that step is whether unsanctioned tunneling bypasses inspection, which is not shown for whether tunneled remote administration violates access policy.
C:Ordinary TLS does not imply the session followed approved remote management controls; the requirement concerns whether tunneled remote administration violates access policy, so verification is not the corrective step.
D:Approved remote paths provide audit and access controls; the goal is trusted restoration for whether tunneled remote administration violates access policy. Future hardening is not current-state recovery.