Question 610
Cleanup is not considered complete. The case record describes: Firewall logs show SYN packets to hundreds of ports on one server, but no completed application sessions. What remaining assessment or remediation is justified after the immediate response?
- Rate-limit or block the scanner while watching for subsequent successful access
- Alert on reconnaissance followed by successful authentication or exploit evidence
- Review service exposure and document the scan disposition and observed impact
- Document unsuccessful attempt status and verify server patch posture
Explanation
Correct Answer
C:A controlled assessment distinguishes prevented probes from penetration; this post-containment check determines the remaining scope relevant to whether the traffic represents probing rather than established access before the case is closed.
Incorrect Answers
A:A targeted block reduces exposure without asserting a breach; the requirement concerns whether the traffic represents probing rather than established access, so temporary protection does not complete correction.
B:Multi-stage detection prioritizes consequential activity; the goal is post-containment assessment for whether the traffic represents probing rather than established access. Future hardening is not current-state recovery.
D:Closure should address exposure even without confirmed compromise; it is meant to address whether exploit attempts reached a vulnerable host, not post-containment assessment for whether the traffic represents probing rather than established access.
Question 611
An improvement plan must address recurrence after this case: A vendor remote access appliance shows an unauthorized session using an expired maintenance account. What should the owner add to the normal control review to reduce recurrence?
- Rotate affected appliance secrets and investigate actions during the session
- Expire vendor access automatically and grant just-in-time maintenance privileges
- Enforce device trust and phishing-resistant MFA on remote access
- Correlate appliance auth logs with vendor account lifecycle and maintenance schedule
Explanation
Correct Answer
B:Time-bounded external access reduces dormant entry points; a periodic review of this safeguard can track the risk described by whether old vendor identities are still enabled.
Incorrect Answers
A:Cleanup must inspect what the unauthorized login changed; case recovery is not future-risk control in the decision about whether old vendor identities are still enabled.
C:Strong access controls reduce replay of stolen passwords; that method could help with whether the login pattern indicates credential abuse; the recurrence prevention decision here involves whether old vendor identities are still enabled.
D:Stale credentials can remain functional after the business need ends; for whether old vendor identities are still enabled, an investigation is not recurrence prevention; recurrence prevention remains necessary.
Question 612
To prevent the next similar event, analysts review this case: A visitor plugs a consumer access point into a conference-room Ethernet jack, exposing an internal VLAN. Which preventive change targets the exact pathway that failed?
- Restore approved VLAN configuration and investigate connections made through the AP
- Use network access control and restrict unused switch ports
- Correlate switch port MAC learning, DHCP leases and wireless beacon inventory
- Use protected management frames where supported and monitor rogue radio activity
Explanation
Correct Answer
B:Port admission policies reduce rogue infrastructure; the control owner can test whether this reduces repeat conditions affecting whether a rogue AP bridges a protected wired segment.
Incorrect Answers
A:Recovery includes the exposure window, not just unplugging equipment; the case needs recurrence prevention addressing whether a rogue AP bridges a protected wired segment; case recovery is not future-risk control.
C:An unauthorized bridge may provide wireless access to internal resources; for whether a rogue AP bridges a protected wired segment, an investigation is not recurrence prevention; recurrence prevention remains necessary.
D:PMF reduces spoofed management-frame effects; that method could help with whether management-frame abuse is causing client disruption; the recurrence prevention decision here involves whether a rogue AP bridges a protected wired segment.
Question 613
The coordinator needs corrective action rather than another alert. The event was: Access logs show unauthorized RDP logins from one workstation to several servers using a privileged local account. Which follow-through step verifies the weakness was removed?
- Isolate the source workstation and disable exposed RDP account sessions
- Revert the excessive rule and review administrative sessions during exposure
- Rotate local administrator passwords and inspect altered server configurations
- Use unique local admin credentials and restrict RDP to managed jump hosts
Explanation
Correct Answer
C:Access removal should precede reintegration of affected servers; technical closure should demonstrate that the control gap behind whether local credential reuse enabled RDP spread is actually corrected.
Incorrect Answers
A:Containing the pivot host and identity limits further movement; when judging whether local credential reuse enabled RDP spread, temporary protection does not complete correction; this is instead initial containment or preservation.
B:Recovery checks whether anyone exploited the open access path; the relevant condition for that step is which configuration allowed unauthorized administrative reachability, which is not shown for whether local credential reuse enabled RDP spread.
D:Tiered remote management reduces lateral exposure; the goal is trusted restoration for whether local credential reuse enabled RDP spread. Future hardening is not current-state recovery.
Question 614
For the next control cycle, the responder supplies this incident history: A remote access system allows stale machine certificates after corporate laptops are retired. Which ongoing safeguard should be implemented and tested?
- Reissue trust only to inventoried compliant devices
- Inspect certificate issuance, revocation status and device access events
- Link device decommissioning with certificate revocation and VPN policy
- Expire vendor access automatically and grant just-in-time maintenance privileges
Explanation
Correct Answer
C:Lifecycle integration prevents orphaned trust; a periodic review of this safeguard can track the risk described by whether certificate trust still authorizes retired devices.
Incorrect Answers
A:Recovery restores accountable device access; when judging whether certificate trust still authorizes retired devices, case recovery is not future-risk control; this is instead trusted restoration.
B:An old certificate can remain valid after asset ownership changes; for whether certificate trust still authorizes retired devices, an investigation is not recurrence prevention; recurrence prevention remains necessary.
D:Time-bounded external access reduces dormant entry points; the relevant condition for that step is whether old vendor identities are still enabled, which is not shown for whether certificate trust still authorizes retired devices.
Question 615
A responder is tasked with limiting immediate impact after this report: A volumetric UDP flood saturates the organization's upstream internet link before traffic reaches local firewalls. Which immediate safeguard protects the case while later remediation is planned?
- Compare provider interface utilization with local device counters
- Validate legitimate traffic paths and withdraw emergency routing changes safely
- Engage the ISP or scrubbing provider for upstream diversion and filtering
- Enable appropriate upstream SYN mitigation and rate-limiting capacity
- Contract upstream DDoS response and exercise traffic diversion
Explanation
Correct Answer
C:Mitigation before the bottleneck restores usable bandwidth; the protective decision should be recorded and its effect tested against where traffic must be filtered to restore availability.
Incorrect Answers
A:If the circuit is saturated upstream, on-premises drops cannot free the link; the goal is initial containment or preservation for where traffic must be filtered to restore availability. Investigation alone does not control current conditions.
B:Post-attack checks should confirm service and route stability; corrective follow-through follows initial protection in the decision about where traffic must be filtered to restore availability.
D:Protection should reduce bogus half-open connections before table exhaustion; it is meant to address whether state exhaustion is driving the outage, not initial containment or preservation for where traffic must be filtered to restore availability.
E:Preparation matters when local controls cannot see all attack packets; for where traffic must be filtered to restore availability, prevention cannot replace immediate action; initial containment or preservation remains necessary.
Question 616
Responders are preparing to reinstate operations after this situation: A wireless security survey detects an access point advertising the approved SSID from a location outside the building. What should be corrected before technical closure of the incident?
- Validate AP firmware, client behavior and stable reconnection after mitigation
- Remove confirmed unauthorized equipment and review any associated clients
- Maintain wireless intrusion detection and approved AP inventories
- Initiate a scoped rogue-AP investigation and protect clients from association
Explanation
Correct Answer
B:A rogue device may have captured traffic or credentials; this goes beyond temporary protection and addresses the failure identified through whether the radio is authorized infrastructure.
Incorrect Answers
A:Recovery must show normal wireless service; it is meant to address whether management-frame abuse is causing client disruption, not trusted restoration for whether the radio is authorized infrastructure.
C:Continuous comparison detects new unauthorized radios; the goal is trusted restoration for whether the radio is authorized infrastructure. Future hardening is not current-state recovery.
D:Containment follows authorized wireless response channels; temporary protection does not complete correction in the decision about whether the radio is authorized infrastructure.
Question 617
Before destructive cleanup is authorized, the team faces this situation: A VPN account authenticates successfully from two distant regions minutes apart with unusual device fingerprints. Which protective response should the coordinator authorize now?
- Correlate VPN session IDs, MFA events, device identifiers and geolocation context
- Rotate compromised credentials and inspect accessed internal resources
- Revoke suspicious VPN sessions and impose a targeted account challenge
- Revoke certificates tied to lost or retired devices and terminate active sessions
Explanation
Correct Answer
C:Identity containment interrupts remote access while investigation continues; the scope of this restriction follows whether the login pattern indicates credential abuse rather than indiscriminately changing unrelated assets.
Incorrect Answers
A:Impossible-travel-like signals require corroboration with session and proxy context; for whether the login pattern indicates credential abuse, investigation alone does not control current conditions; initial containment or preservation remains necessary.
B:Removing the active session does not resolve subsequent unauthorized activity; the requirement concerns whether the login pattern indicates credential abuse, so corrective follow-through follows initial protection.
D:Identity revocation closes the device-authentication path; the other incident centers on whether certificate trust still authorizes retired devices, not this initial containment or preservation question about whether the login pattern indicates credential abuse.
Question 618
The response team seeks the relevant control point for this problem: A compromised identity establishes a reverse SSH tunnel from a database host to an external server. What protection would be proportionate to the observed incident?
- Remove unauthorized keys and startup entries and rotate exposed credentials
- Terminate the tunnel and restrict unauthorized SSH egress from the host
- Correlate SSH process arguments with firewall flows and local listening ports
- Restrict management access to approved jump hosts or private networks
Explanation
Correct Answer
B:Blocking the control path limits remote database reachability; it restricts the path implicated in whether outbound encrypted traffic enables inbound control; later eradication and restoration remain separate decisions.
Incorrect Answers
A:Eradication closes both access and persistence mechanisms; the requirement concerns whether outbound encrypted traffic enables inbound control, so corrective follow-through follows initial protection.
C:A reverse tunnel can expose internal services through an outbound connection; investigation alone does not control current conditions in the decision about whether outbound encrypted traffic enables inbound control.
D:Source constraints reduce internet attack surface immediately; the activity targets which configuration allowed unauthorized administrative reachability; initial containment or preservation here concerns whether outbound encrypted traffic enables inbound control.
Question 619
An evidence-led review starts with the following report: Network flows show outbound traffic to a sanctioned CDN, but one web request contains a hidden upload to an attacker-controlled path. What investigation should establish the disputed activity and its timeline?
- Block the specific unauthorized upload destination or path at the appropriate proxy
- Use egress proxy policy and anomaly detection for unusual file uploads
- Correlate process identity, destination ownership and backup schedule with network flow
- Inspect HTTP host/path and application upload events where legally available
Explanation
Correct Answer
D:Shared infrastructure reputation cannot distinguish malicious paths without request context; it makes the determination of whether trusted hosting masks unauthorized upload defensible and reviewable by the incident owner.
Incorrect Answers
A:Fine-grained filtering avoids disrupting the entire CDN; when judging whether trusted hosting masks unauthorized upload, immediate protection does not substantiate findings; this is instead initial containment or preservation.
B:Destination-aware controls help catch abuse of trusted infrastructure; for whether trusted hosting masks unauthorized upload, prevention is not incident verification; evidence validation remains necessary.
C:Volume and timing alone cannot distinguish backup from theft; this serves whether unusual egress is approved backup or exfiltration, whereas the requested result is evidence validation involving whether trusted hosting masks unauthorized upload.
Question 620
An improvement plan must address recurrence after this case: An employee uses a corporate proxy to upload classified engineering files to an unauthorized personal cloud account. What should the owner add to the normal control review to reduce recurrence?
- Join proxy upload metadata with data classification and employee identity
- Block the unapproved upload channel and preserve evidence for HR and security review
- Use egress controls and workload accounting alerts on shared compute systems
- Assess transferred information and revoke unsanctioned sharing links where possible
- Enforce data loss prevention policies based on classification and destination
Explanation
Correct Answer
E:Content-aware controls limit improper transfers; the ongoing control is targeted at whether network policy misuse caused data leakage, rather than a one-time emergency fix.
Incorrect Answers
A:Approved browser access does not authorize transfers of restricted information; an investigation is not recurrence prevention in the decision about whether network policy misuse caused data leakage.
B:Response should stop further disclosure while respecting due process; the case needs recurrence prevention addressing whether network policy misuse caused data leakage; one-time protection is not durable prevention.
C:Visibility reduces hidden misuse; this serves whether resource consumption is policy abuse or sanctioned computation, whereas the requested result is recurrence prevention involving whether network policy misuse caused data leakage.
D:Recovery addresses data exposure rather than only browsing access; for whether network policy misuse caused data leakage, case recovery is not future-risk control; recurrence prevention remains necessary.