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Exam Code: CISSP
Exam Name: Certified Information Systems Security Professional
Certification Provider: ISC
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Certified Information Systems Security Professional CISSP Practice Test 23

Question 220

A manufacturing controller is business-critical but cannot tolerate intrusive scans. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Verify segmentation on a diagram without testing allowed traffic between plant and corporate networks
  2. Confirm a scan completes without reviewing whether process stability and safety were affected
  3. Check IT vulnerability scores but ignore passive OT telemetry and approved test boundaries
  4. Review passive telemetry and scheduled safe test approvals

Explanation

Correct Answer

D:

OT safety and availability constraints can prohibit standard active tests. The result of the remedy is checked directly: Review passive telemetry and scheduled safe test approvals.

Incorrect Answers

A:

An observation of “Verify segmentation on a diagram without testing allowed traffic between plant and corporate networks” would not verify the relevant control. OT safety and availability constraints can prohibit standard active tests. The necessary acceptance evidence is “Review passive telemetry and scheduled safe test approvals”.

B:

The acceptance test must demonstrate “Review passive telemetry and scheduled safe test approvals” because OT safety and availability constraints can prohibit standard active tests. “Confirm a scan completes without reviewing whether process stability and safety were affected” cannot establish that result.

C:

An observation of “Check IT vulnerability scores but ignore passive OT telemetry and approved test boundaries” would not verify the relevant control. OT safety and availability constraints can prohibit standard active tests. The necessary acceptance evidence is “Review passive telemetry and scheduled safe test approvals”.

Question 221

A container image is signed but pulls vulnerable runtime dependencies. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Apply image provenance verification and vulnerability policy at deployment
  2. Accept every signed container image without checking known vulnerabilities in runtime dependencies
  3. Block unsigned images but allow vulnerable signed packages to deploy automatically
  4. Check application source scans but exclude the container image's embedded library versions

Explanation

Correct Answer

A:

Integrity provenance and vulnerability status are separate properties. A direct way to confirm the outcome is to check both signature validation and vulnerable package admission decisions.

Incorrect Answers

B:

“Accept every signed container image without checking known vulnerabilities in runtime dependencies” is not the relevant mitigation. Integrity provenance and vulnerability status are separate properties. The scenario calls for “Apply image provenance verification and vulnerability policy at deployment”; the acceptance check is “Check both signature validation and vulnerable package admission decisions”.

C:

The proposal “Block unsigned images but allow vulnerable signed packages to deploy automatically” does not meet the relevant requirement because integrity provenance and vulnerability status are separate properties. The matching remediation is “Apply image provenance verification and vulnerability policy at deployment”.

D:

“Check application source scans but exclude the container image's embedded library versions” is not the relevant mitigation. Integrity provenance and vulnerability status are separate properties. The scenario calls for “Apply image provenance verification and vulnerability policy at deployment”; the acceptance check is “Check both signature validation and vulnerable package admission decisions”.

Question 222

A container image is signed but pulls vulnerable runtime dependencies. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm the deployment runs normally without testing a known-vulnerable package rejection
  2. Check both signature validation and vulnerable package admission decisions
  3. Inspect the CI build log without evaluating both provenance and dependency policy at admission
  4. Validate image signatures only and call the vulnerability admission policy effective

Explanation

Correct Answer

B:

Integrity provenance and vulnerability status are separate properties. The result of the remedy is checked directly: Check both signature validation and vulnerable package admission decisions.

Incorrect Answers

A:

Integrity provenance and vulnerability status are separate properties. The proposed check, “Confirm the deployment runs normally without testing a known-vulnerable package rejection”, misses the relevant outcome; “Check both signature validation and vulnerable package admission decisions” tests whether the intended remedy worked.

C:

Integrity provenance and vulnerability status are separate properties. The proposed check, “Inspect the CI build log without evaluating both provenance and dependency policy at admission”, misses the relevant outcome; “Check both signature validation and vulnerable package admission decisions” tests whether the intended remedy worked.

D:

“Validate image signatures only and call the vulnerability admission policy effective” does not show the required outcome: check both signature validation and vulnerable package admission decisions. That test matters because integrity provenance and vulnerability status are separate properties.

Question 223

A shared cloud service stores tenant data in one database schema. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Hide foreign tenant records in the front end but permit direct API requests against them
  2. Authenticate the user once and allow that identity to request any tenant's object identifier
  3. Enforce tenant-scoped authorization and isolation at every data access path
  4. Encrypt the shared database while leaving tenant selectors supplied unchecked by the requester

Explanation

Correct Answer

C:

Authentication alone does not ensure tenant isolation. A direct way to confirm the outcome is to test cross-tenant record requests using valid but foreign credentials.

Incorrect Answers

A:

The security distinction is that authentication alone does not ensure tenant isolation. “Hide foreign tenant records in the front end but permit direct API requests against them” addresses neither the required “Enforce tenant-scoped authorization and isolation at every data access path” action nor its supporting evidence: “Test cross-tenant record requests using valid but foreign credentials”.

B:

Authentication alone does not ensure tenant isolation. “Authenticate the user once and allow that identity to request any tenant's object identifier” does not supply that control; “Enforce tenant-scoped authorization and isolation at every data access path” addresses the identified gap, and “Test cross-tenant record requests using valid but foreign credentials” verifies the result.

D:

Authentication alone does not ensure tenant isolation. “Encrypt the shared database while leaving tenant selectors supplied unchecked by the requester” does not supply that control; “Enforce tenant-scoped authorization and isolation at every data access path” addresses the identified gap, and “Test cross-tenant record requests using valid but foreign credentials” verifies the result.

Question 224

A shared cloud service stores tenant data in one database schema. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm a customer can read its own records but never attempt another tenant's known object ID
  2. Review data-at-rest encryption without testing cross-tenant authorization enforcement
  3. Check UI record filters while valid foreign-tenant API requests still succeed
  4. Test cross-tenant record requests using valid but foreign credentials

Explanation

Correct Answer

D:

Authentication alone does not ensure tenant isolation. The result of the remedy is checked directly: Test cross-tenant record requests using valid but foreign credentials.

Incorrect Answers

A:

“Confirm a customer can read its own records but never attempt another tenant's known object ID” evaluates something other than the specified fix. The meaningful evidence is “Test cross-tenant record requests using valid but foreign credentials”, reflecting the requirement that authentication alone does not ensure tenant isolation.

B:

“Review data-at-rest encryption without testing cross-tenant authorization enforcement” is insufficient to demonstrate that “Enforce tenant-scoped authorization and isolation at every data access path” works. Authentication alone does not ensure tenant isolation. The decisive test is “Test cross-tenant record requests using valid but foreign credentials”.

C:

“Check UI record filters while valid foreign-tenant API requests still succeed” evaluates something other than the specified fix. The meaningful evidence is “Test cross-tenant record requests using valid but foreign credentials”, reflecting the requirement that authentication alone does not ensure tenant isolation.

Question 225

An internet-facing device accepts firmware updates without signature validation. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Require authenticated firmware update verification and rollback controls
  2. Use transport encryption but skip signature verification on the installed firmware payload
  3. Install unsigned updates automatically and rely on a later device health check to reveal compromise
  4. Accept firmware updates when their filenames match the manufacturer's standard naming scheme

Explanation

Correct Answer

A:

Firmware authenticity is critical for embedded-system integrity. A direct way to confirm the outcome is to install a tampered update in a test fixture and verify rejection.

Incorrect Answers

B:

“Use transport encryption but skip signature verification on the installed firmware payload” would not establish the protection described: firmware authenticity is critical for embedded-system integrity. The necessary change is “Require authenticated firmware update verification and rollback controls” with the verification “Install a tampered update in a test fixture and verify rejection”.

C:

“Install unsigned updates automatically and rely on a later device health check to reveal compromise” leaves the essential control missing: firmware authenticity is critical for embedded-system integrity. The direct corrective action is “Require authenticated firmware update verification and rollback controls”, validated by the acceptance check “Install a tampered update in a test fixture and verify rejection”.

D:

“Accept firmware updates when their filenames match the manufacturer's standard naming scheme” would not establish the protection described: firmware authenticity is critical for embedded-system integrity. The necessary change is “Require authenticated firmware update verification and rollback controls” with the verification “Install a tampered update in a test fixture and verify rejection”.

Question 226

An internet-facing device accepts firmware updates without signature validation. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Verify the new firmware version number without checking authenticated update rejection
  2. Install a tampered update in a test fixture and verify rejection
  3. Confirm a legitimate vendor update installs but never submit a tampered image
  4. Inspect the download TLS certificate while the device's installer accepts unsigned packages

Explanation

Correct Answer

B:

Firmware authenticity is critical for embedded-system integrity. The result of the remedy is checked directly: Install a tampered update in a test fixture and verify rejection.

Incorrect Answers

A:

An observation of “Verify the new firmware version number without checking authenticated update rejection” would not verify the relevant control. Firmware authenticity is critical for embedded-system integrity. The necessary acceptance evidence is “Install a tampered update in a test fixture and verify rejection”.

C:

An observation of “Confirm a legitimate vendor update installs but never submit a tampered image” would not verify the relevant control. Firmware authenticity is critical for embedded-system integrity. The necessary acceptance evidence is “Install a tampered update in a test fixture and verify rejection”.

D:

The acceptance test must demonstrate “Install a tampered update in a test fixture and verify rejection” because firmware authenticity is critical for embedded-system integrity. “Inspect the download TLS certificate while the device's installer accepts unsigned packages” cannot establish that result.

Question 227

A serverless function can reach an unrestricted internal management API. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Block public ingress to the function but allow its execution role unrestricted internal administration
  2. Add input validation to the function handler while leaving its outbound management API privileges intact
  3. Constrain its identity permissions and outbound resource policy
  4. Trust the serverless platform's managed infrastructure as sufficient authorization for all internal calls

Explanation

Correct Answer

C:

Managed compute does not remove application authorization responsibility. A direct way to confirm the outcome is to invoke a test call using the function principal and verify denial.

Incorrect Answers

A:

The proposal “Block public ingress to the function but allow its execution role unrestricted internal administration” does not meet the relevant requirement because managed compute does not remove application authorization responsibility. The matching remediation is “Constrain its identity permissions and outbound resource policy”.

B:

“Add input validation to the function handler while leaving its outbound management API privileges intact” is not the relevant mitigation. Managed compute does not remove application authorization responsibility. The scenario calls for “Constrain its identity permissions and outbound resource policy”; the acceptance check is “Invoke a test call using the function principal and verify denial”.

D:

“Trust the serverless platform's managed infrastructure as sufficient authorization for all internal calls” is not the relevant mitigation. Managed compute does not remove application authorization responsibility. The scenario calls for “Constrain its identity permissions and outbound resource policy”; the acceptance check is “Invoke a test call using the function principal and verify denial”.

Question 228

A serverless function can reach an unrestricted internal management API. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Check inbound API protection but not the function principal's outbound permissions
  2. Verify cloud deployment success while a prohibited management call still executes
  3. Confirm the function runs under a managed service without requesting the forbidden management action
  4. Invoke a test call using the function principal and verify denial

Explanation

Correct Answer

D:

Managed compute does not remove application authorization responsibility. The result of the remedy is checked directly: Invoke a test call using the function principal and verify denial.

Incorrect Answers

A:

Managed compute does not remove application authorization responsibility. The proposed check, “Check inbound API protection but not the function principal's outbound permissions”, misses the relevant outcome; “Invoke a test call using the function principal and verify denial” tests whether the intended remedy worked.

B:

“Verify cloud deployment success while a prohibited management call still executes” does not show the required outcome: invoke a test call using the function principal and verify denial. That test matters because managed compute does not remove application authorization responsibility.

C:

Managed compute does not remove application authorization responsibility. The proposed check, “Confirm the function runs under a managed service without requesting the forbidden management action”, misses the relevant outcome; “Invoke a test call using the function principal and verify denial” tests whether the intended remedy worked.

Question 229

An encrypted archive must remain decryptable during planned administrator turnover. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Implement documented key rotation, escrow and recovery ownership
  2. Rotate the encryption key immediately without retaining authorized access to older archive versions
  3. Store the ciphertext indefinitely but never designate custodians for the keys needed after turnover
  4. Give every replacement administrator a shared plaintext copy of the archive key

Explanation

Correct Answer

A:

Key continuity must be planned independently of ciphertext storage. A direct way to confirm the outcome is to perform controlled restore with authorized successor custodians.

Incorrect Answers

B:

Key continuity must be planned independently of ciphertext storage. “Rotate the encryption key immediately without retaining authorized access to older archive versions” does not supply that control; “Implement documented key rotation, escrow and recovery ownership” addresses the identified gap, and “Perform controlled restore with authorized successor custodians” verifies the result.

C:

The security distinction is that key continuity must be planned independently of ciphertext storage. “Store the ciphertext indefinitely but never designate custodians for the keys needed after turnover” addresses neither the required “Implement documented key rotation, escrow and recovery ownership” action nor its supporting evidence: “Perform controlled restore with authorized successor custodians”.

D:

Key continuity must be planned independently of ciphertext storage. “Give every replacement administrator a shared plaintext copy of the archive key” does not supply that control; “Implement documented key rotation, escrow and recovery ownership” addresses the identified gap, and “Perform controlled restore with authorized successor custodians” verifies the result.

Question 230

An encrypted archive must remain decryptable during planned administrator turnover. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm the archive file exists without restoring it under successor credentials
  2. Perform controlled restore with authorized successor custodians
  3. Check key-rotation job success but not access to legacy encrypted records
  4. Review the former administrator's recovery documentation without performing controlled handover tests

Explanation

Correct Answer

B:

Key continuity must be planned independently of ciphertext storage. The result of the remedy is checked directly: Perform controlled restore with authorized successor custodians.

Incorrect Answers

A:

“Confirm the archive file exists without restoring it under successor credentials” evaluates something other than the specified fix. The meaningful evidence is “Perform controlled restore with authorized successor custodians”, reflecting the requirement that key continuity must be planned independently of ciphertext storage.

C:

“Check key-rotation job success but not access to legacy encrypted records” evaluates something other than the specified fix. The meaningful evidence is “Perform controlled restore with authorized successor custodians”, reflecting the requirement that key continuity must be planned independently of ciphertext storage.

D:

“Review the former administrator's recovery documentation without performing controlled handover tests” is insufficient to demonstrate that “Implement documented key rotation, escrow and recovery ownership” works. Key continuity must be planned independently of ciphertext storage. The decisive test is “Perform controlled restore with authorized successor custodians”.

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