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CompTIA CS0-003 Practice Test 5

Question 40

A SOC loses seven hours of endpoint telemetry during a collector outage. What is the MOST appropriate analyst action based on the evidence?

  1. Use authenticated encrypted log transport and protected receiver access.
  2. Fix and test parsing of the destination field using representative source events.
  3. Deduplicate on source event identifiers before correlation.
  4. Restore buffered collection where available and label the evidence gap explicitly.

Explanation

Correct Answer

D:

Gaps must be recognized instead of inventing a complete timeline. Assess incomplete event collection.

Incorrect Answers

A:

Integrity and confidentiality prevent interception or tampering in transit. It would secure telemetry transport, but it would not assess incomplete event collection.

B:

A parser losing essential fields breaks downstream detection conditions. It could help repair normalized destination field, but it would not assess incomplete event collection.

C:

Duplicate ingestion inflates counts and obscures actual incident scope. That is relevant to log ingestion integrity, not to assess incomplete event collection.

Question 41

Backups replicate ransomware-encrypted files to the recovery region immediately. Which next step is MOST defensible for the security team?

  1. Preserve immutable versioned backups and verify recovery points preceding encryption.
  2. Configure equivalent log forwarding on active and standby units and test failover.
  3. Add the recovery environment to log ingestion and test detection in DR exercises.
  4. Enforce boot-time enrollment and reject noncompliant nodes from sensitive workloads.

Explanation

Correct Answer

A:

Synchronous replication is not a substitute for clean historical recovery. Keep recoverable backup versions.

Incorrect Answers

B:

High availability must preserve security telemetry across failover events. That is relevant to data-center resilience and visibility, not to keep recoverable backup versions.

C:

Monitoring continuity is part of operational recovery readiness. It would validate monitoring in DR environment, but it would not keep recoverable backup versions.

D:

Dynamic infrastructure requires automated baseline enforcement. It could help secure newly scaled compute nodes, but it would not keep recoverable backup versions.

Question 42

A SIEM displays identical authentication events with local and UTC timestamps. Which action BEST aligns with sound security operations?

  1. Confirm UTC normalization and repair NTP synchronization before sequencing alerts.
  2. Normalize ingestion timestamps to a common time standard while retaining source time.
  3. Reduce excessive debug verbosity and restore log forwarding with retention controls.
  4. Enable the required process audit categories and verify event collection.

Explanation

Correct Answer

B:

Consistent time normalization prevents false event ordering across time zones. Reconcile mixed timezone formats.

Incorrect Answers

A:

Clock drift makes correlated identity and endpoint event order unreliable. That is relevant to cross-platform log clock accuracy, not to reconcile mixed timezone formats.

C:

Logging volume can exhaust storage and disrupt security telemetry. It could help restore telemetry after log volume exhaustion, but it would not reconcile mixed timezone formats.

D:

Missing audit coverage cannot be reconstructed from coarse severity logs. That is relevant to cross-platform log clock accuracy, not to reconcile mixed timezone formats.

Question 43

Local admin membership unexpectedly expands after a help-desk script runs. Which response BEST addresses the security problem described?

  1. Apply endpoint DLP or removable-media policy for the identified sensitive groups.
  2. Replace the shared credential with scoped identities and rotate existing secrets.
  3. Compare membership change events with approved requests and remediate excessive grants.
  4. Inspect EDR process creation and quarantine records before concluding execution occurred.

Explanation

Correct Answer

C:

Privileged group drift can stem from faulty automation or abuse. Investigate privileged local group expansion.

Incorrect Answers

A:

Controls at the endpoint can enforce transfer restrictions before data leaves. It would enforce removable-media data controls, but it would not investigate privileged local group expansion.

B:

Shared elevated identities increase lateral movement exposure and reduce attribution. It could help remove shared backup service credential, but it would not investigate privileged local group expansion.

D:

A detection or quarantine alone does not establish successful execution. It would distinguish file detection from executed process, but it would not investigate privileged local group expansion.

Question 44

Firewall logging stops during failover even though traffic continues through the standby appliance. Which investigative or response action BEST fits the evidence?

  1. Add the recovery environment to log ingestion and test detection in DR exercises.
  2. Preserve immutable versioned backups and verify recovery points preceding encryption.
  3. Enforce boot-time enrollment and reject noncompliant nodes from sensitive workloads.
  4. Configure equivalent log forwarding on active and standby units and test failover.

Explanation

Correct Answer

D:

High availability must preserve security telemetry across failover events. Maintain firewall logs through failover.

Incorrect Answers

A:

Monitoring continuity is part of operational recovery readiness. It could help validate monitoring in DR environment, but it would not maintain firewall logs through failover.

B:

Synchronous replication is not a substitute for clean historical recovery. That is relevant to data-center resilience and visibility, not to maintain firewall logs through failover.

C:

Dynamic infrastructure requires automated baseline enforcement. It would secure newly scaled compute nodes, but it would not maintain firewall logs through failover.

Question 45

A proxy bypass change is logged without the requester's identity. What is the MOST appropriate analyst action based on the evidence?

  1. Correlate identity-provider change logs and enforce attributable administrative actions.
  2. Compare capture vantage points, NAT translations and timestamps.
  3. Enforce approved DNS and route controls for managed remote sessions.
  4. Remove unrestricted inbound access and allow only approved bastion source ranges.

Explanation

Correct Answer

A:

Policy audit trails need a responsible actor for investigation. Restore attribution for network policy changes.

Incorrect Answers

B:

Address translation and observation location can explain apparently inconsistent traffic records. It would reconcile firewall and packet-capture evidence, but it would not restore attribution for network policy changes.

C:

Uncontrolled name resolution can evade monitoring and filtering. It could help prevent remote DNS policy bypass, but it would not restore attribution for network policy changes.

D:

Narrow administrative exposure reduces remote attack surface. That is relevant to network security policy validation, not to restore attribution for network policy changes.

Question 46

Authentication logs contain user principal names but EDR records only device-local SIDs. Which next step is MOST defensible for the security team?

  1. Revoke application tokens and assess any actions after the deprovision timestamp.
  2. Join SID mappings to identity inventory and preserve mapping timestamps.
  3. Check device-compliance and conditional-access decisions before resetting credentials.
  4. Investigate assertion mapping and reject nonunique identities until corrected.

Explanation

Correct Answer

B:

Identity enrichment makes cross-system activity attributable without conflating users. Map local SID to enterprise identity.

Incorrect Answers

A:

Disabling interactive sign-in may not cancel prior API credentials. It would remediate stale application tokens, but it would not map local SID to enterprise identity.

C:

Authorization can fail on device posture after successful authentication. That is relevant to alert identity enrichment and authentication gaps, not to map local SID to enterprise identity.

D:

Identity collisions undermine attribution and can cross authorization boundaries. It would correct SAML subject mapping collision, but it would not map local SID to enterprise identity.

Question 47

A SOC sees encrypted database columns but unrestricted export of decrypted reports. Which action BEST aligns with sound security operations?

  1. Check certificate subject names and replace the misissued binding before trusting the service.
  2. Exempt the pinned flow under approved policy and obtain endpoint or network metadata.
  3. Apply DLP policies to authorized export destinations and monitor sensitive data movement.
  4. Revoke or replace the exposed certificate credentials and protect the backup.

Explanation

Correct Answer

C:

Encryption at rest alone cannot stop misuse after decryption. Protect decrypted sensitive report exports.

Incorrect Answers

A:

A trusted issuer does not repair a hostname identity mismatch. It could help remediate TLS hostname mismatch, but it would not protect decrypted sensitive report exports.

B:

Certificate pinning can prevent decryption while alternate telemetry preserves monitoring. That is relevant to certificate and encryption telemetry, not to protect decrypted sensitive report exports.

D:

Disclosure of a private key invalidates its secrecy even before observed abuse. It could help respond to exposed signing key, but it would not protect decrypted sensitive report exports.

Question 48

An access switch learns a new device MAC on a port reserved for a kiosk. Which response BEST addresses the security problem described?

  1. Restrict management access to a segregated administrative network.
  2. Protect the internal hop with appropriate transport encryption or segmented trust boundary.
  3. Verify forwarding configuration and block unauthorized telemetry export.
  4. Validate inventory and enforce port or network access control for the approved device.

Explanation

Correct Answer

D:

Unexpected attachment may represent rogue access or maintenance drift. Investigate unauthorized switch port attachment.

Incorrect Answers

A:

Guest access to device control planes increases privilege-escalation opportunity. That is relevant to network device and service context, not to investigate unauthorized switch port attachment.

B:

Terminating TLS at the edge does not secure exposed backend traffic. It would remediate unencrypted backend service hop, but it would not investigate unauthorized switch port attachment.

C:

Security logs can themselves contain sensitive infrastructure intelligence. It could help stop unauthorized DNS-log forwarding, but it would not investigate unauthorized switch port attachment.

Question 49

USB storage writes are allowed to all corporate devices despite data handling rules. Which investigative or response action BEST fits the evidence?

  1. Apply endpoint DLP or removable-media policy for the identified sensitive groups.
  2. Replace the shared credential with scoped identities and rotate existing secrets.
  3. Compare membership change events with approved requests and remediate excessive grants.
  4. Inspect EDR process creation and quarantine records before concluding execution occurred.

Explanation

Correct Answer

A:

Controls at the endpoint can enforce transfer restrictions before data leaves. Enforce removable-media data controls.

Incorrect Answers

B:

Shared elevated identities increase lateral movement exposure and reduce attribution. It could help remove shared backup service credential, but it would not enforce removable-media data controls.

C:

Privileged group drift can stem from faulty automation or abuse. That is relevant to endpoint controls and data paths, not to enforce removable-media data controls.

D:

A detection or quarantine alone does not establish successful execution. It would distinguish file detection from executed process, but it would not enforce removable-media data controls.

Question 50

A firewall stops forwarding after its verbose debug logging fills its partition. What is the MOST appropriate analyst action based on the evidence?

  1. Normalize ingestion timestamps to a common time standard while retaining source time.
  2. Reduce excessive debug verbosity and restore log forwarding with retention controls.
  3. Confirm UTC normalization and repair NTP synchronization before sequencing alerts.
  4. Enable the required process audit categories and verify event collection.

Explanation

Correct Answer

B:

Logging volume can exhaust storage and disrupt security telemetry. Restore telemetry after log volume exhaustion.

Incorrect Answers

A:

Consistent time normalization prevents false event ordering across time zones. It could help reconcile mixed timezone formats, but it would not restore telemetry after log volume exhaustion.

C:

Clock drift makes correlated identity and endpoint event order unreliable. It would correct cross-source event time skew, but it would not restore telemetry after log volume exhaustion.

D:

Missing audit coverage cannot be reconstructed from coarse severity logs. It could help expand audited operating-system events, but it would not restore telemetry after log volume exhaustion.


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