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CompTIA CAS-005 Practice Test 5

Question 40

In Regional water authority, a security issue affects remote telemetry service: field concentrators trust commands from a shared regional access gateway. The observed evidence is that design review finds unauthenticated actuator message forwarding behind gateway. Operations must account for this constraint: pumping safety forbids uncontrolled test shutdown. A completed diagnosis now needs an enforceable control architecture. Which control best resolves the documented weakness?

  1. Assume internal placement behind a VPN is equivalent to command authorization
  2. Bind signed command identity to device and operator authorization at the controller
  3. Trace STRIDE-style spoofing and tampering routes through field-controller trust boundaries
  4. Update threat model as new partner concentrators or radio links are introduced

Explanation

Correct Answer

B:

Bind signed command identity to device and operator authorization at the controller is the durable measure that addresses the observed weakness: field concentrators trust commands from a shared regional access gateway. It must be enforceable while preserving the stated constraint: pumping safety forbids uncontrolled test shutdown.

Incorrect Answers

A:

Network location does not prove message authenticity or operator privilege. The immediate requirement for remote telemetry service is durable control selection, which this alternative does not provide.

C:

Investigation characterizes the problem, but the case already establishes the failure path and asks for an enforceable control. In this case, the evidence involves remote telemetry service and design review finds unauthenticated actuator message forwarding behind gateway.

D:

Monitoring after rollout is not a substitute for specifying the control that should be enforced. In this case, the evidence involves remote telemetry service and design review finds unauthenticated actuator message forwarding behind gateway.

Question 41

In Healthcare endpoint fleet, a security issue affects ransomware-resistant workstations: ordinary office process spawns PowerShell to write to a protected backup directory. The observed evidence is that EDR graph shows unsigned child process and blocked memory injection. Operations must account for this constraint: radiology scheduling must remain available during policy rollout. Implementation is the remaining gate; neither another design document nor a postrelease audit replaces it. Which execution action is best?

  1. Pilot block mode on representative desktops with emergency application allowlist workflow
  2. Track policy exceptions, suspicious process ancestry and response latency
  3. Disable all PowerShell, including approved signed administration, permanently
  4. Use application control and EDR prevention for untrusted process chains

Explanation

Correct Answer

A:

Pilot block mode on representative desktops with emergency application allowlist workflow provides a governed means to introduce the chosen safeguard while respecting radiology scheduling must remain available during policy rollout. A sound design without a safe, authorized rollout does not establish operating protection.

Incorrect Answers

B:

Future assurance does not install the approved change under the current availability constraint. In this case, the evidence involves ransomware-resistant workstations and EDR graph shows unsigned child process and blocked memory injection.

C:

A universal binary ban can break necessary maintenance without controlling abuse paths precisely. The immediate requirement for ransomware-resistant workstations is safe implementation, which this alternative does not provide.

D:

The design has already been selected and approved; choosing it again does not make a reversible operational change. In this case, the evidence involves ransomware-resistant workstations and EDR graph shows unsigned child process and blocked memory injection.

Question 42

In Industrial automation vendor, a security issue affects embedded controller firmware: field upgrade can load an unsigned image through maintenance connector. The observed evidence is that test bench accepts a modified boot image before user authentication. Operations must account for this constraint: controllers have limited CPU and safety cutovers. The owner requests acceptance evidence, rather than a deployment success message. Which validation is most conclusive?

  1. Inspect firmware trust root, update transport and immutable boot state
  2. Stage signed firmware updates with safe recovery partition and maintenance authorization
  3. Load altered or downgraded firmware in test and verify boot rejection
  4. Rely on checksum downloaded over plaintext as proof of firmware authenticity

Explanation

Correct Answer

C:

Load altered or downgraded firmware in test and verify boot rejection tests whether the original failure can still occur and whether authorized activity continues to work. A change ticket or rollout confirmation is weaker than direct acceptance evidence.

Incorrect Answers

A:

Cause analysis belongs before implementation; it is not a retest of the deployed control on the originally affected path. In this case, the evidence involves embedded controller firmware and test bench accepts a modified boot image before user authentication.

B:

A governed rollout makes the solution live, but installation and rollback readiness do not establish effectiveness. In this case, the evidence involves embedded controller firmware and test bench accepts a modified boot image before user authentication.

D:

Unkeyed checksums detect corruption but not deliberate malicious replacement. The immediate requirement for embedded controller firmware is verified remediation, which this alternative does not provide.

Question 43

In International nonprofit, a security issue affects cloud bucket exposure incident: public bucket policy reveals donor-contact files. The observed evidence is that cloud audit shows anonymous object reads and recent policy edit. Operations must account for this constraint: donor assistance systems must retain approved access. Implementation is the remaining gate; neither another design document nor a postrelease audit replaces it. Which execution action is best?

  1. Assume encryption at rest prevents any readable anonymous access
  2. Remove public access and require approved scoped identity permissions
  3. Preserve object and policy records before staged access correction
  4. Monitor bucket policy drift and future exposure indicators

Explanation

Correct Answer

C:

Preserve object and policy records before staged access correction provides a governed means to introduce the chosen safeguard while respecting donor assistance systems must retain approved access. A sound design without a safe, authorized rollout does not establish operating protection.

Incorrect Answers

A:

Provider-managed storage encryption does not replace object authorization. The immediate requirement for cloud bucket exposure incident is safe implementation, which this alternative does not provide.

B:

The design has already been selected and approved; choosing it again does not make a reversible operational change. In this case, the evidence involves cloud bucket exposure incident and cloud audit shows anonymous object reads and recent policy edit.

D:

Future assurance does not install the approved change under the current availability constraint. In this case, the evidence involves cloud bucket exposure incident and cloud audit shows anonymous object reads and recent policy edit.

Question 44

In Manufacturing ERP operator, a security issue affects legacy application tier: flat trust permits office workstations to query production database directly. The observed evidence is that network map shows shared credentials across test and production. Operations must account for this constraint: older ERP cannot support modern client identity natively. Implementation is the remaining gate; neither another design document nor a postrelease audit replaces it. Which execution action is best?

  1. Introduce application proxy and segmented database access with distinct service identities
  2. Review new data paths and privileged session patterns for policy drift
  3. Block all database ports without mapping required legacy job dependencies
  4. Stage proxy routing and credential rotation using monitored fallback

Explanation

Correct Answer

D:

Stage proxy routing and credential rotation using monitored fallback provides a governed means to introduce the chosen safeguard while respecting older ERP cannot support modern client identity natively. A sound design without a safe, authorized rollout does not establish operating protection.

Incorrect Answers

A:

The design has already been selected and approved; choosing it again does not make a reversible operational change. In this case, the evidence involves legacy application tier and network map shows shared credentials across test and production.

B:

Future assurance does not install the approved change under the current availability constraint. In this case, the evidence involves legacy application tier and network map shows shared credentials across test and production.

C:

Unplanned isolation could halt critical manufacturing reconciliation. The immediate requirement for legacy application tier is safe implementation, which this alternative does not provide.

Question 45

In Insurance claims processor, a security issue affects certificate revocation checks: public gateway accepts revoked operator certificate during an OCSP outage. The observed evidence is that mTLS logs show soft-fail despite policy requiring hard fail for privileged paths. Operations must account for this constraint: customer read-only service must remain available during CA outages. The solution is approved and a production rollout is pending. Which change action manages availability, authorization and reversibility?

  1. Treat valid certificate dates as proof that it has not been revoked
  2. Stage OCSP stapling and deny-by-default policy with pretested emergency certificate route
  3. Monitor revocation freshness, cert expiry and CA responder resiliency
  4. Require fail-closed revocation for privileged APIs and isolated low-risk browsing availability

Explanation

Correct Answer

B:

Stage OCSP stapling and deny-by-default policy with pretested emergency certificate route provides a governed means to introduce the chosen safeguard while respecting customer read-only service must remain available during CA outages. A sound design without a safe, authorized rollout does not establish operating protection.

Incorrect Answers

A:

Expiry is independent of explicit revocation and compromise. The immediate requirement for certificate revocation checks is safe implementation, which this alternative does not provide.

C:

Future assurance does not install the approved change under the current availability constraint. In this case, the evidence involves certificate revocation checks and mTLS logs show soft-fail despite policy requiring hard fail for privileged paths.

D:

The design has already been selected and approved; choosing it again does not make a reversible operational change. In this case, the evidence involves certificate revocation checks and mTLS logs show soft-fail despite policy requiring hard fail for privileged paths.

Question 46

In Global payment processing, a security issue affects SIEM fraud priorities: analysts rank all failed logins above active privileged changes to payout rules. The observed evidence is that event graph shows authorized batch retries and one unapproved payment-role grant. Operations must account for this constraint: service continuity requires batching legitimate payment jobs. Architects have verified the problem and must select a lasting safeguard. Which proposed design is most appropriate?

  1. Suppress every privileged-change alert while reducing login noise
  2. Apply risk-aware correlation linking role grants to payout changes and approvals
  3. Correlate identity, source behavior, business criticality and authorization evidence
  4. Monitor alert outcomes and false-suppression risk after workflow changes

Explanation

Correct Answer

B:

Apply risk-aware correlation linking role grants to payout changes and approvals is the durable measure that addresses the observed weakness: analysts rank all failed logins above active privileged changes to payout rules. It must be enforceable while preserving the stated constraint: service continuity requires batching legitimate payment jobs.

Incorrect Answers

A:

High-impact authorization changes cannot be ignored for cleaner metrics. The immediate requirement for SIEM fraud priorities is durable control selection, which this alternative does not provide.

C:

Investigation characterizes the problem, but the case already establishes the failure path and asks for an enforceable control. In this case, the evidence involves SIEM fraud priorities and event graph shows authorized batch retries and one unapproved payment-role grant.

D:

Monitoring after rollout is not a substitute for specifying the control that should be enforced. In this case, the evidence involves SIEM fraud priorities and event graph shows authorized batch retries and one unapproved payment-role grant.

Question 47

In Financial clearing service, a security issue affects long-lived TLS certificates: executives expect future quantum resilience while today's legacy clients cannot process new algorithms. The observed evidence is that inventory lists ECDH key exchange and several multi-year archives. Operations must account for this constraint: cross-bank interoperability must survive phased migration. The decision is now about a preventive or corrective security architecture, not investigation or rollout. What should be chosen?

  1. Track algorithm deprecation and key lifetime across archive systems
  2. Inventory cryptographic usage, data lifetime and quantum migration risks
  3. Design crypto-agile negotiation and hybrid PQC evaluation for long-lived confidentiality
  4. Replace every cipher tomorrow with an untested PQC library

Explanation

Correct Answer

C:

Design crypto-agile negotiation and hybrid PQC evaluation for long-lived confidentiality is the durable measure that addresses the observed weakness: executives expect future quantum resilience while today's legacy clients cannot process new algorithms. It must be enforceable while preserving the stated constraint: cross-bank interoperability must survive phased migration.

Incorrect Answers

A:

Monitoring after rollout is not a substitute for specifying the control that should be enforced. In this case, the evidence involves long-lived TLS certificates and inventory lists ECDH key exchange and several multi-year archives.

B:

Investigation characterizes the problem, but the case already establishes the failure path and asks for an enforceable control. In this case, the evidence involves long-lived TLS certificates and inventory lists ECDH key exchange and several multi-year archives.

D:

Abrupt migration can break critical protocols and unvalidated crypto creates new risk. The immediate requirement for long-lived TLS certificates is durable control selection, which this alternative does not provide.

Question 48

In Global investment firm, a security issue affects multi-cloud audit collectors: temporary cloud role permits unrestricted key export across accounts. The observed evidence is that cloud inventory reveals one vendor automation identity with broad key permissions. Operations must account for this constraint: regulatory retention demands immutable logs. Architects have verified the problem and must select a lasting safeguard. Which proposed design is most appropriate?

  1. Alert on changes to role trust and anomalous key-access approvals
  2. Enumerate trust policies, permission bindings and key-management ownership across tenants
  3. Use workload federation with least-privilege key operations and customer-controlled KMS policies
  4. Put all cloud keys in the vendor's shared administrative account

Explanation

Correct Answer

C:

Use workload federation with least-privilege key operations and customer-controlled KMS policies is the durable measure that addresses the observed weakness: temporary cloud role permits unrestricted key export across accounts. It must be enforceable while preserving the stated constraint: regulatory retention demands immutable logs.

Incorrect Answers

A:

Monitoring after rollout is not a substitute for specifying the control that should be enforced. In this case, the evidence involves multi-cloud audit collectors and cloud inventory reveals one vendor automation identity with broad key permissions.

B:

Investigation characterizes the problem, but the case already establishes the failure path and asks for an enforceable control. In this case, the evidence involves multi-cloud audit collectors and cloud inventory reveals one vendor automation identity with broad key permissions.

D:

Shared high-privilege custody increases cross-tenant compromise impact. The immediate requirement for multi-cloud audit collectors is durable control selection, which this alternative does not provide.

Question 49

In Industrial sensor SaaS, a security issue affects customer-managed cloud data keys: tenant onboarding creates provider-managed keys despite contractual customer control. The observed evidence is that audit shows key policy permits provider support decrypt without tenant approval. Operations must account for this constraint: critical sensor alerts cannot pause during key migration. Normal operations have resumed; leadership now wants sustained assurance rather than another one-time deployment. What should be tracked?

  1. Report drift in key policy and overdue grant revocations to tenant owners
  2. Test provider-support decrypt denial and authorized sensor data access
  3. Treat provider-managed encryption at rest as equivalent to customer-held key authority
  4. Adopt customer-controlled keys with tenant-approved decrypt grants and rotation policies

Explanation

Correct Answer

A:

Report drift in key policy and overdue grant revocations to tenant owners identifies future loss of control, changed dependencies and exceptions affecting customer-managed cloud data keys. Successful initial testing alone does not establish that the safeguard will remain effective.

Incorrect Answers

B:

A one-time retest may miss later identity, supplier or configuration changes; continuing assurance is required. In this case, the evidence involves customer-managed cloud data keys and audit shows key policy permits provider support decrypt without tenant approval.

C:

Encrypted storage does not imply customer control over decryption authority. The immediate requirement for customer-managed cloud data keys is ongoing assurance, which this alternative does not provide.

D:

Designing the safeguard is an earlier stage; ongoing assurance needs operational evidence of drift or bypass. In this case, the evidence involves customer-managed cloud data keys and audit shows key policy permits provider support decrypt without tenant approval.

Question 50

In Regional hospital, a security issue affects central log pipeline: time drift makes correlated EDR and authentication events appear reversed. The observed evidence is that endpoint timestamp is seven minutes ahead of IdP while ingest time is accurate. Operations must account for this constraint: incident evidence must preserve original timestamps for legal review. Implementation is the remaining gate; neither another design document nor a postrelease audit replaces it. Which execution action is best?

  1. Declare lateral movement simply from apparent log order
  2. Monitor time synchronization drift and cross-source correlation confidence
  3. Normalize event time with recorded offsets while retaining original evidence
  4. Deploy clock correction and parser offset annotations by affected source

Explanation

Correct Answer

D:

Deploy clock correction and parser offset annotations by affected source provides a governed means to introduce the chosen safeguard while respecting incident evidence must preserve original timestamps for legal review. A sound design without a safe, authorized rollout does not establish operating protection.

Incorrect Answers

A:

Uncorrected clock offset can fabricate an attack sequence. The immediate requirement for central log pipeline is safe implementation, which this alternative does not provide.

B:

Future assurance does not install the approved change under the current availability constraint. In this case, the evidence involves central log pipeline and endpoint timestamp is seven minutes ahead of IdP while ingest time is accurate.

C:

The design has already been selected and approved; choosing it again does not make a reversible operational change. In this case, the evidence involves central log pipeline and endpoint timestamp is seven minutes ahead of IdP while ingest time is accurate.

CompTIA SecurityX (CAS-005) Practice Tests