Question 630
To distinguish suspicion from confirmed impact, the SOC examines this case: An API service fails under a small number of computationally expensive authenticated search requests. Which review would give the incident owner the strongest case-specific evidence?
- Correlate endpoint latency, query cost, authenticated caller and request frequency
- Correlate 429 rates, client identity and completed legitimate transactions
- Use per-client quotas, query budgets and abuse analytics
- Apply endpoint-specific rate limits and cost caps to abusive clients
Explanation
Correct Answer
A:Low-volume requests can exhaust CPU or database resources without a volumetric flood; that evidence directly tests the concern about whether application-layer resource exhaustion is responsible, rather than relying on a single unverified indicator.
Incorrect Answers
B:Excessive throttling can become a self-inflicted availability issue; the activity targets whether mitigation is blocking legitimate clients; evidence validation here concerns whether application-layer resource exhaustion is responsible.
C:Business-aware controls limit layer-seven denial of service; the goal is evidence validation for whether application-layer resource exhaustion is responsible. Prevention is not incident verification.
D:Application-aware throttling targets expensive requests; immediate protection does not substantiate findings in the decision about whether application-layer resource exhaustion is responsible.
Question 631
During lessons learned, the security owner reviews this completed incident: Firewall logs show SYN packets to hundreds of ports on one server, but no completed application sessions. Which repeatable safeguard best prevents this failure mode in the future?
- Prioritize correlated exploit and post-exploitation detections
- Correlate SYN and response patterns with successful handshakes and service logs
- Alert on reconnaissance followed by successful authentication or exploit evidence
- Review service exposure and document the scan disposition and observed impact
Explanation
Correct Answer
C:Multi-stage detection prioritizes consequential activity; it closes a repeatable gap revealed by whether the traffic represents probing rather than established access without removing useful monitoring.
Incorrect Answers
A:Multi-source validation reduces false incident escalation; it is meant to address whether exploit attempts reached a vulnerable host, not recurrence prevention for whether the traffic represents probing rather than established access.
B:Incomplete connection attempts suggest reconnaissance but do not prove application compromise; when judging whether the traffic represents probing rather than established access, an investigation is not recurrence prevention; this is instead evidence validation.
D:A controlled assessment distinguishes prevented probes from penetration; the requirement concerns whether the traffic represents probing rather than established access, so case recovery is not future-risk control.
Question 632
The recurrence-prevention decision is based on this report: A DNS resolver runs out of worker capacity under a burst of expensive recursive requests. What measure strengthens readiness against the observed event?
- Correlate recursion queue, response latency and requester distribution
- Validate caching and resolver service health before restoring external access
- Use per-client quotas, query budgets and abuse analytics
- Do not expose unrestricted recursion and monitor resolver capacity
Explanation
Correct Answer
D:Baseline protections reduce abuse as an amplifier or target; it makes the lesson about whether resolver resource exhaustion is the outage cause part of normal operations.
Incorrect Answers
A:Large recursion work can degrade DNS even if interface bandwidth is not full; the requirement concerns whether resolver resource exhaustion is the outage cause, so an investigation is not recurrence prevention.
B:Correct recovery confirms normal name resolution for legitimate users; the goal is recurrence prevention for whether resolver resource exhaustion is the outage cause. Case recovery is not future-risk control.
C:Business-aware controls limit layer-seven denial of service; the activity targets whether application-layer resource exhaustion is responsible; recurrence prevention here concerns whether resolver resource exhaustion is the outage cause.
Question 633
A post-incident audit examines the following failure mode: A network incident runbook directs staff to block an IP at a decommissioned firewall rather than the current edge gateway. What recurring check or restriction would best address the weakness?
- Maintain immutable off-device network configuration backups
- Trigger playbook review after network migrations and segmentation changes
- Compare topology documentation and active routing with the referenced firewall path
- Update containment diagrams and perform an end-to-end blocking test
Explanation
Correct Answer
B:Change-aware documentation keeps emergency instructions usable; the assurance measure is designed around whether emergency network enforcement points are current, rather than hiding the reported activity.
Incorrect Answers
A:Independent baselines support dependable incident recovery; the relevant condition for that step is whether trusted baseline configurations are available, which is not shown for whether emergency network enforcement points are current.
C:An obsolete enforcement point cannot stop traffic that bypasses it; the goal is recurrence prevention for whether emergency network enforcement points are current. An investigation is not recurrence prevention.
D:A verified rule should take effect where intended; case recovery is not future-risk control in the decision about whether emergency network enforcement points are current.
Question 634
For the next control cycle, the responder supplies this incident history: A firewall rule permits inbound management traffic from any internet address after an emergency deployment. Which ongoing safeguard should be implemented and tested?
- Use reviewed network-device configuration management and admin MFA
- Restrict management access to approved jump hosts or private networks
- Revert the excessive rule and review administrative sessions during exposure
- Review rule hit logs, deployment diff and management-plane listening interfaces
- Require peer-reviewed policy-as-code checks for management ingress
Explanation
Correct Answer
E:Preventive validation catches broad administrator access rules; a periodic review of this safeguard can track the risk described by which configuration allowed unauthorized administrative reachability.
Incorrect Answers
A:Change control exposes covert monitoring configuration; the activity targets whether configuration change enabled traffic interception; recurrence prevention here concerns which configuration allowed unauthorized administrative reachability.
B:Source constraints reduce internet attack surface immediately; for which configuration allowed unauthorized administrative reachability, one-time protection is not durable prevention; recurrence prevention remains necessary.
C:Recovery checks whether anyone exploited the open access path; the requirement concerns which configuration allowed unauthorized administrative reachability, so case recovery is not future-risk control.
D:A broad source range can expose administrative services beyond intended operators; the goal is recurrence prevention for which configuration allowed unauthorized administrative reachability. An investigation is not recurrence prevention.
Question 635
An evidence-led review starts with the following report: A visitor plugs a consumer access point into a conference-room Ethernet jack, exposing an internal VLAN. What investigation should establish the disputed activity and its timeline?
- Correlate switch port MAC learning, DHCP leases and wireless beacon inventory
- Examine 802.11 management frame capture, source addresses and AP association events
- Disable the affected switch port and secure the rogue hardware under procedure
- Use network access control and restrict unused switch ports
Explanation
Correct Answer
A:An unauthorized bridge may provide wireless access to internal resources; this permits a traceable finding about whether a rogue AP bridges a protected wired segment before the team makes a disruptive change.
Incorrect Answers
B:Deauthentication floods can cause disconnections without normal data traffic; it is meant to address whether management-frame abuse is causing client disruption, not evidence validation for whether a rogue AP bridges a protected wired segment.
C:Port-level containment removes the unintended bridge; the requirement concerns whether a rogue AP bridges a protected wired segment, so immediate protection does not substantiate findings.
D:Port admission policies reduce rogue infrastructure; the goal is evidence validation for whether a rogue AP bridges a protected wired segment. Prevention is not incident verification.
Question 636
A containment decision is required for this incident: A host sends large outbound bursts to a new autonomous system after midnight, but normal backup jobs also run then. What action constrains the incident at the affected point of control?
- Limit the suspect host's DNS egress to approved resolvers and isolate as needed
- Temporarily restrict the unapproved destination after validating business ownership
- Correlate process identity, destination ownership and backup schedule with network flow
- Investigate transferred data and remediate the access route if unauthorized
Explanation
Correct Answer
B:Selective containment avoids terminating legitimate protected backup traffic; it protects the affected workflow while investigators continue resolving whether unusual egress is approved backup or exfiltration.
Incorrect Answers
A:Routing control interrupts covert outbound channels; it is meant to address whether DNS tunneling may carry encoded data, not initial containment or preservation for whether unusual egress is approved backup or exfiltration.
C:Volume and timing alone cannot distinguish backup from theft; when judging whether unusual egress is approved backup or exfiltration, investigation alone does not control current conditions; this is instead evidence validation.
D:Scope assessment is necessary even after the flow stops; for whether unusual egress is approved backup or exfiltration, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
Question 637
The first task is to corroborate an alert. The case notes state: Packet captures are available but no sensor covers the segment between two data-center application tiers. What should the investigator examine to distinguish a substantiated finding from an assumption?
- Inspect network dependencies and documented safe-isolation procedures
- Test network visibility during red-team and incident exercises
- Enable scoped capture at an authorized aggregation or switch mirror point
- Map sensor placement against the observed inter-tier route
Explanation
Correct Answer
D:A blind spot can explain why lateral traffic is absent from telemetry; this evidence is scoped to whether network monitoring sees suspected east-west movement, not a generic system-health reading.
Incorrect Answers
A:Removing the wrong uplink could disrupt physical safety functions; the activity targets whether segmentation plans protect critical operational dependencies; evidence validation here concerns whether network monitoring sees suspected east-west movement.
B:Coverage validation reveals gaps missed by perimeter-only monitoring; the goal is evidence validation for whether network monitoring sees suspected east-west movement. Prevention is not incident verification.
C:Targeted visibility supports analysis without changing endpoint state; immediate protection does not substantiate findings in the decision about whether network monitoring sees suspected east-west movement.
Question 638
The affected workflow needs an integrity and access check following this event: An attacker uses a compromised switch management account to add a port mirror toward an unauthorized collector. What case-specific cleanup or recovery step establishes a trusted state?
- Restore trusted switch configuration and rotate administration credentials
- Use reviewed network-device configuration management and admin MFA
- Reissue trust only to inventoried compliant devices
- Disable the unauthorized mirror and restrict compromised management access
Explanation
Correct Answer
A:Remediation must address both setup and access method; the owner can validate the correction against the evidence bearing on whether configuration change enabled traffic interception.
Incorrect Answers
B:Change control exposes covert monitoring configuration; future hardening is not current-state recovery in the decision about whether configuration change enabled traffic interception.
C:Recovery restores accountable device access; it is meant to address whether certificate trust still authorizes retired devices, not trusted restoration for whether configuration change enabled traffic interception.
D:Stopping the copy path limits continued interception; when judging whether configuration change enabled traffic interception, temporary protection does not complete correction; this is instead initial containment or preservation.
Question 639
The initial scene or threat protection decision concerns the following: A warehouse barcode scanner connects to an open guest SSID rather than its protected operational WLAN. How should responders limit the damage while retaining the investigation trail?
- Review scanner WLAN profile, association records and transmitted application protocol
- Disable the unsafe network profile and isolate exposed scanner sessions
- Warn users and coordinate wireless containment under authorized procedures
- Reprovision the scanner onto the approved secured SSID and rotate affected credentials
Explanation
Correct Answer
B:Configuration containment stops continued transmission over the wrong path; the protective decision should be recorded and its effect tested against whether client misassociation caused insecure traffic.
Incorrect Answers
A:An open wireless association changes confidentiality and access assumptions; for whether client misassociation caused insecure traffic, investigation alone does not control current conditions; initial containment or preservation remains necessary.
C:Avoid indiscriminate jamming while protecting clients from the fake network; the activity targets whether an evil twin access point is impersonating the SSID; initial containment or preservation here concerns whether client misassociation caused insecure traffic.
D:Restoring intended association must address secrets possibly exposed; corrective follow-through follows initial protection in the decision about whether client misassociation caused insecure traffic.
Question 640
A containment decision is required for this incident: Incident handlers lack an approved method to isolate network devices that manage safety-critical building controls. What action constrains the incident at the affected point of control?
- Coordinate with facilities before applying a narrow containment ACL
- Validate alternate management access and normal control flows before restoration
- Identify the actual transit control before applying an approved block
- Inspect network dependencies and documented safe-isolation procedures
Explanation
Correct Answer
A:Risk-aware enforcement protects essential operation while limiting attacker reach; it protects the affected workflow while investigators continue resolving whether segmentation plans protect critical operational dependencies.
Incorrect Answers
B:Recovery must verify the safety system remains functional; the case needs initial containment or preservation addressing whether segmentation plans protect critical operational dependencies; corrective follow-through follows initial protection.
C:The response must interrupt the live packet path without damaging unrelated routes; it is meant to address whether emergency network enforcement points are current, not initial containment or preservation for whether segmentation plans protect critical operational dependencies.
D:Removing the wrong uplink could disrupt physical safety functions; for whether segmentation plans protect critical operational dependencies, investigation alone does not control current conditions; initial containment or preservation remains necessary.