Question 570
Forensic review begins with this reported event: Access logs show unauthorized RDP logins from one workstation to several servers using a privileged local account. Which evidence-based task answers the primary uncertainty?
- Compare RDP logon events, source identifiers and reused account names
- Isolate the source workstation and disable exposed RDP account sessions
- Use unique local admin credentials and restrict RDP to managed jump hosts
- Inspect switch configuration diff, command audit and physical port inventory
Explanation
Correct Answer
A:Repeated privileged remote logons indicate likely credential-driven movement; the review should retain source and timing information relevant to whether local credential reuse enabled RDP spread.
Incorrect Answers
B:Containing the pivot host and identity limits further movement; the requirement concerns whether local credential reuse enabled RDP spread, so immediate protection does not substantiate findings.
C:Tiered remote management reduces lateral exposure; the goal is evidence validation for whether local credential reuse enabled RDP spread. Prevention is not incident verification.
D:A mirror configuration can reveal confidential traffic without changing production routes; it is meant to address whether configuration change enabled traffic interception, not evidence validation for whether local credential reuse enabled RDP spread.
Question 571
The owner must verify the return to a trusted state for the following: A service remains unavailable after malicious traffic stops because a gateway's session table is still exhausted. Choose THREE actions that separately (1) verify the reported facts, (2) protect against immediate harm and (3) correct the underlying failure before service returns. (Choose THREE.)
- Measure current session-table usage and compare with live traffic volume
- Verify normal new connections and tune session timeouts appropriately
- Harden UDP services against reflection and use source-address anti-spoofing
- Expire abusive state entries through approved controls without dropping all production sessions
- Monitor connection state exhaustion and test recovery procedures
- Contract upstream DDoS response and exercise traffic diversion
Explanation
Correct Answers
A:Residual device state can sustain an outage after the attack source subsides; within the combined response for whether stale state prevents recovery, this supplies evidence validation: it makes the determination of whether stale state prevents recovery defensible and reviewable by the incident owner.
B:Restoration depends on state resources, not just stopping packets; within the combined response for whether stale state prevents recovery, this supplies trusted restoration: the recovery decision is tied to whether stale state prevents recovery, not merely to reduced alert volume.
D:Selective cleanup can recover capacity while limiting disruption; within the combined response for whether stale state prevents recovery, this supplies initial containment or preservation: this is a first-response safeguard for whether stale state prevents recovery, not a substitute for full root-cause analysis.
Incorrect Answers
C:Ingress and egress validation reduce spoofed-packet abuse; it is meant to address whether amplification rather than direct requests caused the flood, not trusted restoration for whether stale state prevents recovery.
E:Capacity alarms provide earlier warning during floods; the requirement concerns whether stale state prevents recovery, so future hardening is not current-state recovery.
F:Preparation matters when local controls cannot see all attack packets; the other incident centers on where traffic must be filtered to restore availability, not this trusted restoration question about whether stale state prevents recovery.
Question 572
The response team seeks the relevant control point for this problem: A firewall rule permits inbound management traffic from any internet address after an emergency deployment. What protection would be proportionate to the observed incident?
- Disable the unauthorized mirror and restrict compromised management access
- Review rule hit logs, deployment diff and management-plane listening interfaces
- Revert the excessive rule and review administrative sessions during exposure
- Restrict management access to approved jump hosts or private networks
Explanation
Correct Answer
D:Source constraints reduce internet attack surface immediately; the immediate response addresses which configuration allowed unauthorized administrative reachability while the team preserves relevant case records.
Incorrect Answers
A:Stopping the copy path limits continued interception; that method could help with whether configuration change enabled traffic interception; the initial containment or preservation decision here involves which configuration allowed unauthorized administrative reachability.
B:A broad source range can expose administrative services beyond intended operators; the goal is initial containment or preservation for which configuration allowed unauthorized administrative reachability. Investigation alone does not control current conditions.
C:Recovery checks whether anyone exploited the open access path; corrective follow-through follows initial protection in the decision about which configuration allowed unauthorized administrative reachability.
Question 573
Before granting routine access again, the team reviews this case: A vendor remote access appliance shows an unauthorized session using an expired maintenance account. What must the response owner validate as part of safe recovery?
- Disable the obsolete vendor account and terminate its active connections
- Rotate compromised credentials and inspect accessed internal resources
- Rotate affected appliance secrets and investigate actions during the session
- Expire vendor access automatically and grant just-in-time maintenance privileges
Explanation
Correct Answer
C:Cleanup must inspect what the unauthorized login changed; it is the corrective action needed for whether old vendor identities are still enabled after the immediate hazard is controlled.
Incorrect Answers
A:Immediate identity revocation cuts off the remote path; when judging whether old vendor identities are still enabled, temporary protection does not complete correction; this is instead initial containment or preservation.
B:Removing the active session does not resolve subsequent unauthorized activity; the relevant condition for that step is whether the login pattern indicates credential abuse, which is not shown for whether old vendor identities are still enabled.
D:Time-bounded external access reduces dormant entry points; the goal is trusted restoration for whether old vendor identities are still enabled. Future hardening is not current-state recovery.
Question 574
The responder must establish the timeline from this observation: A shared conference-room machine generates high volumes of unsolicited email using the corporate address space. Which analysis step best addresses the missing confirmation?
- Restrict direct SMTP egress and monitor abnormal sending rates
- Correlate flow destinations, host processes and workload approvals
- Stop unauthorized outbound SMTP from the host and isolate it
- Review SMTP connection logs, user sessions and process activity
Explanation
Correct Answer
D:A mail burst may be caused by malware or unauthorized bulk-mail software; the review should retain source and timing information relevant to whether host misuse is causing outbound abuse.
Incorrect Answers
A:Central mail relays enable better abuse controls; the case needs evidence validation addressing whether host misuse is causing outbound abuse; prevention is not incident verification.
B:Port number alone cannot establish whether compute activity is legitimate; it is meant to address whether resource consumption is policy abuse or sanctioned computation, not evidence validation for whether host misuse is causing outbound abuse.
C:Network containment protects domain reputation and limits distribution; for whether host misuse is causing outbound abuse, immediate protection does not substantiate findings; evidence validation remains necessary.
Question 575
While full remediation remains pending, the commander receives this incident report: A DNS resolver runs out of worker capacity under a burst of expensive recursive requests. Which first protective measure directly limits the situation without assuming cleanup is finished?
- Validate caching and resolver service health before restoring external access
- Apply endpoint-specific rate limits and cost caps to abusive clients
- Correlate recursion queue, response latency and requester distribution
- Restrict recursion to approved clients and apply query-rate controls
Explanation
Correct Answer
D:Narrowing who can request expensive recursion reduces immediate demand; the scope of this restriction follows whether resolver resource exhaustion is the outage cause rather than indiscriminately changing unrelated assets.
Incorrect Answers
A:Correct recovery confirms normal name resolution for legitimate users; the case needs initial containment or preservation addressing whether resolver resource exhaustion is the outage cause; corrective follow-through follows initial protection.
B:Application-aware throttling targets expensive requests; that method could help with whether application-layer resource exhaustion is responsible; the initial containment or preservation decision here involves whether resolver resource exhaustion is the outage cause.
C:Large recursion work can degrade DNS even if interface bandwidth is not full; for whether resolver resource exhaustion is the outage cause, investigation alone does not control current conditions; initial containment or preservation remains necessary.
Question 576
Before making any disruptive change, an investigator is handed these observations: A wireless security survey detects an access point advertising the approved SSID from a location outside the building. Which source best supports the incident finding before responders modify the environment?
- Maintain wireless intrusion detection and approved AP inventories
- Initiate a scoped rogue-AP investigation and protect clients from association
- Compare BSSID, radio location, authentication certificate and approved AP inventory
- Compare BSSID, hardware inventory and measured signal location
Explanation
Correct Answer
D:SSID names are not proof of asset ownership; for this investigation, the relevant uncertainty is whether the radio is authorized infrastructure, so independent confirmation matters.
Incorrect Answers
A:Continuous comparison detects new unauthorized radios; the case needs evidence validation addressing whether the radio is authorized infrastructure; prevention is not incident verification.
B:Containment follows authorized wireless response channels; when judging whether the radio is authorized infrastructure, immediate protection does not substantiate findings; this is instead initial containment or preservation.
C:A familiar SSID can be broadcast by a rogue access point; the relevant condition for that step is whether an evil twin access point is impersonating the SSID, which is not shown for whether the radio is authorized infrastructure.
Question 577
Post-containment analysis identified this issue for correction: A website experiences a flood of SYN packets that fills connection-state tables at the network edge. Which remediation is supported by the observed root-cause conditions?
- Inspect SYN versus completed-handshake rates and firewall state utilization
- Confirm normal handshakes and clean policy state after mitigation
- Enable appropriate upstream SYN mitigation and rate-limiting capacity
- Verify normal new connections and tune session timeouts appropriately
- Arrange upstream DDoS capacity and tune SYN flood protection
Explanation
Correct Answer
B:Recovery needs service-health validation, not just lower packet counts; this goes beyond temporary protection and addresses the failure identified through whether state exhaustion is driving the outage.
Incorrect Answers
A:SYN imbalance together with exhausted connection state supports this flood type; for whether state exhaustion is driving the outage, verification is not the corrective step; trusted restoration remains necessary.
C:Protection should reduce bogus half-open connections before table exhaustion; the goal is trusted restoration for whether state exhaustion is driving the outage. Temporary protection does not complete correction.
D:Restoration depends on state resources, not just stopping packets; this serves whether stale state prevents recovery, whereas the requested result is trusted restoration involving whether state exhaustion is driving the outage.
E:Perimeter resources alone may fail against large distributed attacks; the case needs trusted restoration addressing whether state exhaustion is driving the outage; future hardening is not current-state recovery.
Question 578
Cleanup is not considered complete. The case record describes: A DNS resolver runs out of worker capacity under a burst of expensive recursive requests. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Optimize expensive queries and confirm capacity after controls apply
- Restrict recursion to approved clients and apply query-rate controls
- Validate caching and resolver service health before restoring external access
- Do not expose unrestricted recursion and monitor resolver capacity
Explanation
Correct Answer
C:Correct recovery confirms normal name resolution for legitimate users; the recovery decision is tied to whether resolver resource exhaustion is the outage cause, not merely to reduced alert volume.
Incorrect Answers
A:A sustainable fix addresses resource amplification; this serves whether application-layer resource exhaustion is responsible, whereas the requested result is trusted restoration involving whether resolver resource exhaustion is the outage cause.
B:Narrowing who can request expensive recursion reduces immediate demand; the goal is trusted restoration for whether resolver resource exhaustion is the outage cause. Temporary protection does not complete correction.
D:Baseline protections reduce abuse as an amplifier or target; the case needs trusted restoration addressing whether resolver resource exhaustion is the outage cause; future hardening is not current-state recovery.
Question 579
A containment decision is required for this incident: A corporate Wi-Fi client associates to an unknown access point through a weak pre-shared key reused at a partner site. The incident owner wants a corroborating check and a protective action before recovery begins. Which TWO choices fit these separate tasks? (Choose TWO.)
- Prefer per-user or per-device enterprise authentication over shared PSKs
- Review access point authentication events and key distribution history
- Rotate the exposed key and remove the unapproved device from coverage
- Re-enroll legitimate clients onto a controlled WLAN configuration
- Locate and remove the rogue device and assess exposed credentials
Explanation
Correct Answers
B:A shared passphrase does not distinguish authorized users individually; within the combined response for whether PSK exposure allows unauthorized association, this supplies evidence validation: the objective is to establish whether PSK exposure allows unauthorized association; the result can then guide the later protective decision.
C:Containment blocks continued access using the reused secret; within the combined response for whether PSK exposure allows unauthorized association, this supplies initial containment or preservation: the immediate response addresses whether PSK exposure allows unauthorized association while the team preserves relevant case records.
Incorrect Answers
A:Unique credentials enable revocation and accountability; the case needs initial containment or preservation addressing whether PSK exposure allows unauthorized association; prevention cannot replace immediate action.
D:A safe migration restores secure connectivity; the requirement concerns whether PSK exposure allows unauthorized association, so corrective follow-through follows initial protection.
E:A spoofed WLAN can lead to stolen authentication data; the relevant condition for that step is whether an evil twin access point is impersonating the SSID, which is not shown for whether PSK exposure allows unauthorized association.
Question 580
To avoid broad unnecessary disruption, responders consider this finding: A router configuration backup exists only on the router that may have been modified by an intruder. The current decision requires two different outcomes: evidence-based verification AND initial protection, without treating cleanup as complete. Which TWO measures provide those outcomes? (Choose TWO.)
- Restore a verified approved configuration and rotate device administration secrets
- Compare current running configuration with an independently retained approved backup
- Maintain immutable off-device network configuration backups
- Update containment diagrams and perform an end-to-end blocking test
- Restrict administrative changes and preserve current configuration evidence
Explanation
Correct Answers
B:A local copy could share the compromised state or have been overwritten; within the combined response for whether trusted baseline configurations are available, this supplies evidence validation: that evidence directly tests the concern about whether trusted baseline configurations are available, rather than relying on a single unverified indicator.
E:Containment should prevent additional tampering before correction; within the combined response for whether trusted baseline configurations are available, this supplies initial containment or preservation: the protective decision should be recorded and its effect tested against whether trusted baseline configurations are available.
Incorrect Answers
A:A known-good baseline addresses configuration and credential compromise; corrective follow-through follows initial protection in the decision about whether trusted baseline configurations are available.
C:Independent baselines support dependable incident recovery; when judging whether trusted baseline configurations are available, prevention cannot replace immediate action; this is instead recurrence prevention.
D:A verified rule should take effect where intended; the relevant condition for that step is whether emergency network enforcement points are current, which is not shown for whether trusted baseline configurations are available.