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CompTIA CAS-005 Practice Test 13

Question 120

A fraud model flags every translated message as malicious without contextual evidence. Which action is MOST defensible given these facts?

  1. Use strong out-of-band identity proofing rather than voice familiarity.
  2. Use protected transaction verification and behavioral reporting drills.
  3. Confirm the instruction via a separate trusted authorization channel.
  4. Test fairness and error rates across languages before deployment.

Explanation

Correct Answer

D:

Biased detection can impede legitimate service. The controlling fact is: A fraud model flags every translated message as malicious without contextual evidence.

Incorrect Answers

A:

The reported condition calls for this action: Test fairness and error rates across languages before deployment.

B:

The current facts call for this action: test fairness and error rates across languages before deployment.

C:

Convincing synthetic media does not replace payment controls. The scenario does not present the alternate condition: a finance executive appears in a video call requesting a new urgent wire transfer. The proper immediate action is to test fairness and error rates across languages before deployment.

Question 121

A public API is overwhelmed by requests that individually look valid but exhaust backend transaction processing. Which control or decision MOST directly resolves the stated gap?

  1. Put rate and abuse controls at an API gateway before costly backend execution.
  2. Deploy a WAF with tested route-specific rules in the reverse-proxy path.
  3. Move or supplement inspection at a point with authorized decrypted visibility.
  4. Use passive detection and an approved separate enforcement path.

Explanation

Correct Answer

A:

Admission limits need visibility into client and route context. The controlling fact is: A public API is overwhelmed by requests that individually look valid but exhaust backend transaction processing.

Incorrect Answers

B:

The current facts call for this action: put rate and abuse controls at an API gateway before costly backend execution.

C:

Sensor placement must match the evidence needed to detect attacks. The scenario does not present the alternate condition: a sensor deployed behind a decrypting proxy sees only unrelated encrypted records. The proper immediate action is to put rate and abuse controls at an API gateway before costly backend execution.

D:

The reported condition calls for this action: Put rate and abuse controls at an API gateway before costly backend execution.

Question 122

A financial institution has two logging systems with incompatible user identifiers. What is the appropriate security response for this scenario?

  1. Version schema contracts and regression-test identity context.
  2. Normalize canonical identity keys while retaining source provenance.
  3. Test targeted exceptions against malicious samples and change-control approval.
  4. Use authenticated service identities and authorization policies at the mesh.

Explanation

Correct Answer

B:

Reliable correlation requires stable entities and auditable mapping. The controlling fact is: A financial institution has two logging systems with incompatible user identifiers.

Incorrect Answers

A:

Schema-based testing would not normalize canonical identity keys while retaining source provenance. Reliable correlation requires stable entities and auditable mapping.

C:

Availability and detection efficacy require controlled tuning. The scenario does not present the alternate condition: an inline IPS blocks legitimate healthcare transactions due to a generalized signature. The proper immediate action is to normalize canonical identity keys while retaining source provenance.

D:

Using authenticated service identities and authorization policies at the mesh would not normalize canonical identity keys while retaining source provenance.

Question 123

Remote staff need authenticated access to limited internal administrative tools. What should the enterprise security architect or analyst do NEXT?

  1. Preserve authenticated client attribution through trusted forwarding metadata.
  2. Schedule safe scoped scanning or passive assessment with OT approval.
  3. Terminate VPN access through identity-aware policy with narrow resource routes.
  4. Integrate NAC with device identity and posture enforcement.

Explanation

Correct Answer

C:

Remote connectivity should not imply unrestricted network reach. The controlling fact is: Remote staff need authenticated access to limited internal administrative tools.

Incorrect Answers

A:

Preserving authenticated client attribution through trusted forwarding metadata would not address the need for terminate VPN access through identity-aware policy with narrow resource routes.

B:

The current facts call for this action: terminate VPN access through identity-aware policy with narrow resource routes.

D:

Integrating NAC with device identity and posture enforcement would not address the need for terminate VPN access through identity-aware policy with narrow resource routes.

Question 124

Stateful login sessions are stored only in one web instance while a load balancer spreads requests. Which action is MOST defensible given these facts?

  1. Apply monitored scale-down and capacity bounds without affecting service requirements.
  2. Provision narrowly scoped secrets per workload through approved secret delivery.
  3. Distribute work with horizontal capacity and measure bottlenecks.
  4. Externalize session state or design consistent safe session routing.

Explanation

Correct Answer

D:

Uncoordinated state breaks horizontal scaling. The controlling fact is: Stateful login sessions are stored only in one web instance while a load balancer spreads requests.

Incorrect Answers

A:

The reported condition calls for this action: Externalize session state or design consistent safe session routing.

B:

The current facts call for this action: externalize session state or design consistent safe session routing.

C:

Vertical hardware limits require different scaling behavior. The scenario does not present the alternate condition: a read-heavy service scales vertically until its largest instance is still saturated. The proper immediate action is to externalize session state or design consistent safe session routing.

Question 125

A regulated workload requires regional data residency while also needing disaster recovery. Which action is the BEST response to the security requirement?

  1. Choose approved same-jurisdiction recovery sites with tested isolation.
  2. Revise the architecture or recovery objective based on measured activation time.
  3. Diversify connectivity and critical name-service dependencies.
  4. Use region-aware caching or CDN placement while controlling sensitive content.

Explanation

Correct Answer

A:

Redundancy must respect legal location constraints. The controlling fact is: A regulated workload requires regional data residency while also needing disaster recovery.

Incorrect Answers

B:

The current facts call for this action: choose approved same-jurisdiction recovery sites with tested isolation.

C:

Geographic distribution can still share a common failure point. The scenario does not present the alternate condition: both active sites rely on a single internet transit provider and the same DNS resolver. The proper immediate action is to choose approved same-jurisdiction recovery sites with tested isolation.

D:

The reported condition calls for this action: Choose approved same-jurisdiction recovery sites with tested isolation.

Question 126

A region outage requires operator action to promote the replica but runbooks are obsolete. Which control or decision MOST directly resolves the stated gap?

  1. Design and rehearse failover considering TTL and client behavior.
  2. Test failover and automate only verified steps with rollback options.
  3. Use immutable separated recovery copies and independent credentials.
  4. Define an end-to-end health check tied to useful transaction outcomes.

Explanation

Correct Answer

B:

A documented plan must work under outage conditions. The controlling fact is: A region outage requires operator action to promote the replica but runbooks are obsolete.

Incorrect Answers

A:

Designing and rehearse failover considering TTL and client behavior would not test failover and automate only verified steps with rollback options.

C:

Recoverability depends on isolation from the compromised control plane. The scenario does not present the alternate condition: the backup copies share the production administrator role and are deleted during ransomware. The proper immediate action is to test failover and automate only verified steps with rollback options.

D:

Defining an end-to-end health check tied to useful transaction outcomes would not test failover and automate only verified steps with rollback options.

Question 127

The primary tap sees ingress traffic but not lateral movement between internal app tiers. What is the appropriate security response for this scenario?

  1. Deduplicate by source-event identity while preserving raw copies.
  2. Protect log transport with mutual authentication and encrypted channels.
  3. Place additional east-west sensors on the relevant network paths.
  4. Correlate proxy metadata with app-side logs and endpoint activity.

Explanation

Correct Answer

C:

The observation point must include the protected trust crossing. The controlling fact is: The primary tap sees ingress traffic but not lateral movement between internal app tiers.

Incorrect Answers

A:

Deduplicate by source-event identity while preserving raw copies would not place additional east-west sensors on the relevant network paths.

B:

The current facts call for this action: place additional east-west sensors on the relevant network paths.

D:

Correlating proxy metadata with app-side logs and endpoint activity would not place additional east-west sensors on the relevant network paths.

Question 128

An inline IPS blocks legitimate healthcare transactions due to a generalized signature. Which control or decision MOST directly resolves the stated gap?

  1. Version schema contracts and regression-test identity context.
  2. Use authenticated service identities and authorization policies at the mesh.
  3. Normalize canonical identity keys while retaining source provenance.
  4. Test targeted exceptions against malicious samples and change-control approval.

Explanation

Correct Answer

D:

Availability and detection efficacy require controlled tuning. The controlling fact is: An inline IPS blocks legitimate healthcare transactions due to a generalized signature.

Incorrect Answers

A:

The reported condition calls for this action: Test targeted exceptions against malicious samples and change-control approval.

B:

The current facts call for this action: test targeted exceptions against malicious samples and change-control approval.

C:

Reliable correlation requires stable entities and auditable mapping. The scenario does not present the alternate condition: a financial institution has two logging systems with incompatible user identifiers. The proper immediate action is to test targeted exceptions against malicious samples and change-control approval.

Question 129

A read-heavy service scales vertically until its largest instance is still saturated. What is the appropriate security response for this scenario?

  1. Distribute work with horizontal capacity and measure bottlenecks.
  2. Provision narrowly scoped secrets per workload through approved secret delivery.
  3. Apply monitored scale-down and capacity bounds without affecting service requirements.
  4. Externalize session state or design consistent safe session routing.

Explanation

Correct Answer

A:

Vertical hardware limits require different scaling behavior. The controlling fact is: A read-heavy service scales vertically until its largest instance is still saturated.

Incorrect Answers

B:

The current facts call for this action: distribute work with horizontal capacity and measure bottlenecks.

C:

Elasticity needs both safe growth and removal. The scenario does not present the alternate condition: an autoscaler launches extra instances after demand subsides and costs climb. The proper immediate action is to distribute work with horizontal capacity and measure bottlenecks.

D:

The reported condition calls for this action: Distribute work with horizontal capacity and measure bottlenecks.

Question 130

The backup copies share the production administrator role and are deleted during ransomware. What should the enterprise security architect or analyst do NEXT?

  1. Test failover and automate only verified steps with rollback options.
  2. Use immutable separated recovery copies and independent credentials.
  3. Design and rehearse failover considering TTL and client behavior.
  4. Define an end-to-end health check tied to useful transaction outcomes.

Explanation

Correct Answer

B:

Recoverability depends on isolation from the compromised control plane. The controlling fact is: The backup copies share the production administrator role and are deleted during ransomware.

Incorrect Answers

A:

Testing failover and automate only verified steps with rollback options would not meet the need for immutable evidence retention. Recoverability depends on isolation from the compromised control plane.

C:

External caches affect achieved recovery time. The scenario does not present the alternate condition: disaster recovery depends on DNS changes that clients cache for hours. The proper immediate action is to use immutable separated recovery copies and independent credentials.

D:

Defining an end-to-end health check tied to useful transaction outcomes would not meet the need for immutable evidence retention. Recoverability depends on isolation from the compromised control plane.


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