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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 31

Question 300

An Internet-facing content service faces large traffic spikes from diverse regions. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Open the origin server publicly and assume a CDN automatically limits direct origin traffic
  2. Increase origin CPU alone without accounting for geographically distributed traffic surges
  3. Cache sensitive user pages at the public edge without authorization or cache-key isolation
  4. Use protected CDN distribution with origin restrictions and capacity planning

Explanation

Correct Answer

D:

Content caching protects scalability but cannot substitute for origin authorization. A direct way to confirm the outcome is to verify client requests use the edge while origin access remains scoped.

Incorrect Answers

A:

“Open the origin server publicly and assume a CDN automatically limits direct origin traffic” would not establish the protection described: content caching protects scalability but cannot substitute for origin authorization. The necessary change is “Use protected CDN distribution with origin restrictions and capacity planning” with the verification “Verify client requests use the edge while origin access remains scoped”.

B:

“Increase origin CPU alone without accounting for geographically distributed traffic surges” leaves the essential control missing: content caching protects scalability but cannot substitute for origin authorization. The direct corrective action is “Use protected CDN distribution with origin restrictions and capacity planning”, validated by the acceptance check “Verify client requests use the edge while origin access remains scoped”.

C:

“Cache sensitive user pages at the public edge without authorization or cache-key isolation” would not establish the protection described: content caching protects scalability but cannot substitute for origin authorization. The necessary change is “Use protected CDN distribution with origin restrictions and capacity planning” with the verification “Verify client requests use the edge while origin access remains scoped”.

Question 301

An Internet-facing content service faces large traffic spikes from diverse regions. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Verify client requests use the edge while origin access remains scoped
  2. Review nominal CDN cache hit rates but never simulate regional demand spikes
  3. Check edge HTTPS while unauthorized clients can bypass the edge and reach the origin
  4. Confirm a page loads through the CDN without attempting direct public origin access

Explanation

Correct Answer

A:

Content caching protects scalability but cannot substitute for origin authorization. The result of the remedy is checked directly: Verify client requests use the edge while origin access remains scoped.

Incorrect Answers

B:

An observation of “Review nominal CDN cache hit rates but never simulate regional demand spikes” would not verify the relevant control. Content caching protects scalability but cannot substitute for origin authorization. The necessary acceptance evidence is “Verify client requests use the edge while origin access remains scoped”.

C:

The acceptance test must demonstrate “Verify client requests use the edge while origin access remains scoped” because content caching protects scalability but cannot substitute for origin authorization. “Check edge HTTPS while unauthorized clients can bypass the edge and reach the origin” cannot establish that result.

D:

An observation of “Confirm a page loads through the CDN without attempting direct public origin access” would not verify the relevant control. Content caching protects scalability but cannot substitute for origin authorization. The necessary acceptance evidence is “Verify client requests use the edge while origin access remains scoped”.

Question 302

A carrier provides an unmanaged WAN link between business facilities. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Use a fixed shared tunnel key with no authenticated peer identity or rotation process
  2. Encrypt sensitive traffic across the link with accountable tunnel endpoints
  3. Trust the carrier label private line and transmit sensitive records without end-to-end encryption
  4. Put a network firewall at one office but leave link payloads interceptable along carrier transport

Explanation

Correct Answer

B:

Private leased connectivity does not guarantee confidentiality. A direct way to confirm the outcome is to attempt interception and verify protected payloads and tunnel authentication.

Incorrect Answers

A:

“Use a fixed shared tunnel key with no authenticated peer identity or rotation process” is not the relevant mitigation. Private leased connectivity does not guarantee confidentiality. The scenario calls for “Encrypt sensitive traffic across the link with accountable tunnel endpoints”; the acceptance check is “Attempt interception and verify protected payloads and tunnel authentication”.

C:

“Trust the carrier label private line and transmit sensitive records without end-to-end encryption” is not the relevant mitigation. Private leased connectivity does not guarantee confidentiality. The scenario calls for “Encrypt sensitive traffic across the link with accountable tunnel endpoints”; the acceptance check is “Attempt interception and verify protected payloads and tunnel authentication”.

D:

The proposal “Put a network firewall at one office but leave link payloads interceptable along carrier transport” does not meet the relevant requirement because private leased connectivity does not guarantee confidentiality. The matching remediation is “Encrypt sensitive traffic across the link with accountable tunnel endpoints”.

Question 303

A carrier provides an unmanaged WAN link between business facilities. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm that data arrives across the WAN but never capture the carrier-side payload
  2. Inspect the carrier service contract instead of validating tunnel peer authentication
  3. Attempt interception and verify protected payloads and tunnel authentication
  4. Measure latency and packet loss while transmitted sensitive data remains observable

Explanation

Correct Answer

C:

Private leased connectivity does not guarantee confidentiality. The result of the remedy is checked directly: Attempt interception and verify protected payloads and tunnel authentication.

Incorrect Answers

A:

“Confirm that data arrives across the WAN but never capture the carrier-side payload” does not show the required outcome: attempt interception and verify protected payloads and tunnel authentication. That test matters because private leased connectivity does not guarantee confidentiality.

B:

Private leased connectivity does not guarantee confidentiality. The proposed check, “Inspect the carrier service contract instead of validating tunnel peer authentication”, misses the relevant outcome; “Attempt interception and verify protected payloads and tunnel authentication” tests whether the intended remedy worked.

D:

Private leased connectivity does not guarantee confidentiality. The proposed check, “Measure latency and packet loss while transmitted sensitive data remains observable”, misses the relevant outcome; “Attempt interception and verify protected payloads and tunnel authentication” tests whether the intended remedy worked.

Question 304

A software-defined network controller has unrestricted administrative API access. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Place the SDN controller on the data plane with no separate management authority
  2. Record API request counts but permit unsigned or unauthorized policy changes
  3. Allow all automation accounts administrator control over SDN rules once they reach the controller API
  4. Protect controller identity, policy changes and control-plane separation

Explanation

Correct Answer

D:

Centralized SDN control increases the consequence of controller compromise. A direct way to confirm the outcome is to test that unauthorized controller API changes are denied and logged.

Incorrect Answers

A:

Centralized SDN control increases the consequence of controller compromise. “Place the SDN controller on the data plane with no separate management authority” does not supply that control; “Protect controller identity, policy changes and control-plane separation” addresses the identified gap, and “Test that unauthorized controller API changes are denied and logged” verifies the result.

B:

The security distinction is that centralized SDN control increases the consequence of controller compromise. “Record API request counts but permit unsigned or unauthorized policy changes” addresses neither the required “Protect controller identity, policy changes and control-plane separation” action nor its supporting evidence: “Test that unauthorized controller API changes are denied and logged”.

C:

Centralized SDN control increases the consequence of controller compromise. “Allow all automation accounts administrator control over SDN rules once they reach the controller API” does not supply that control; “Protect controller identity, policy changes and control-plane separation” addresses the identified gap, and “Test that unauthorized controller API changes are denied and logged” verifies the result.

Question 305

A software-defined network controller has unrestricted administrative API access. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Test that unauthorized controller API changes are denied and logged
  2. Verify TLS to the API while unrestricted principals can still modify forwarding policy
  3. Confirm the legitimate controller API updates a rule without submitting a forbidden change
  4. Inspect controller availability rather than denied control-plane requests and identity logs

Explanation

Correct Answer

A:

Centralized SDN control increases the consequence of controller compromise. The result of the remedy is checked directly: Test that unauthorized controller API changes are denied and logged.

Incorrect Answers

B:

“Verify TLS to the API while unrestricted principals can still modify forwarding policy” evaluates something other than the specified fix. The meaningful evidence is “Test that unauthorized controller API changes are denied and logged”, reflecting the requirement that centralized SDN control increases the consequence of controller compromise.

C:

“Confirm the legitimate controller API updates a rule without submitting a forbidden change” is insufficient to demonstrate that “Protect controller identity, policy changes and control-plane separation” works. Centralized SDN control increases the consequence of controller compromise. The decisive test is “Test that unauthorized controller API changes are denied and logged”.

D:

“Inspect controller availability rather than denied control-plane requests and identity logs” evaluates something other than the specified fix. The meaningful evidence is “Test that unauthorized controller API changes are denied and logged”, reflecting the requirement that centralized SDN control increases the consequence of controller compromise.

Question 306

A storage network carries unprotected iSCSI across mixed-trust segments. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Separate iSCSI targets by hostnames only while mixed-trust network hosts share the same reachable ports
  2. Isolate storage flows and authenticate initiators and management interfaces
  3. Protect storage with disk encryption but permit unauthenticated initiators to discover targets
  4. Allow tenant devices on the storage VLAN and rely on users not to mount unauthorized volumes

Explanation

Correct Answer

B:

Converged protocols bring storage trust boundaries into IP networks. A direct way to confirm the outcome is to test a tenant host cannot discover or mount storage targets.

Incorrect Answers

A:

“Separate iSCSI targets by hostnames only while mixed-trust network hosts share the same reachable ports” would not establish the protection described: converged protocols bring storage trust boundaries into IP networks. The necessary change is “Isolate storage flows and authenticate initiators and management interfaces” with the verification “Test a tenant host cannot discover or mount storage targets”.

C:

“Protect storage with disk encryption but permit unauthenticated initiators to discover targets” would not establish the protection described: converged protocols bring storage trust boundaries into IP networks. The necessary change is “Isolate storage flows and authenticate initiators and management interfaces” with the verification “Test a tenant host cannot discover or mount storage targets”.

D:

“Allow tenant devices on the storage VLAN and rely on users not to mount unauthorized volumes” leaves the essential control missing: converged protocols bring storage trust boundaries into IP networks. The direct corrective action is “Isolate storage flows and authenticate initiators and management interfaces”, validated by the acceptance check “Test a tenant host cannot discover or mount storage targets”.

Question 307

A storage network carries unprotected iSCSI across mixed-trust segments. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Inspect the storage array's encryption status while target discovery remains open
  2. Verify iSCSI performance without testing initiator authentication and segmentation boundaries
  3. Test a tenant host cannot discover or mount storage targets
  4. Confirm a legitimate storage initiator can mount its volume without trying a tenant host

Explanation

Correct Answer

C:

Converged protocols bring storage trust boundaries into IP networks. The result of the remedy is checked directly: Test a tenant host cannot discover or mount storage targets.

Incorrect Answers

A:

The acceptance test must demonstrate “Test a tenant host cannot discover or mount storage targets” because converged protocols bring storage trust boundaries into IP networks. “Inspect the storage array's encryption status while target discovery remains open” cannot establish that result.

B:

An observation of “Verify iSCSI performance without testing initiator authentication and segmentation boundaries” would not verify the relevant control. Converged protocols bring storage trust boundaries into IP networks. The necessary acceptance evidence is “Test a tenant host cannot discover or mount storage targets”.

D:

An observation of “Confirm a legitimate storage initiator can mount its volume without trying a tenant host” would not verify the relevant control. Converged protocols bring storage trust boundaries into IP networks. The necessary acceptance evidence is “Test a tenant host cannot discover or mount storage targets”.

Question 308

A latency-sensitive service suffers packet delay from uncontrolled bulk transfers. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Disable network security filters during large transfers to reduce latency instead of managing congestion
  2. Give bulk backups permanent traffic priority over the latency-sensitive application
  3. Increase link bandwidth without measuring queue contention or defining QoS behavior
  4. Set monitored network capacity and QoS controls without weakening security policy

Explanation

Correct Answer

D:

Performance and security both depend on real traffic measurements. A direct way to confirm the outcome is to measure latency, jitter and packet loss under competing load.

Incorrect Answers

A:

“Disable network security filters during large transfers to reduce latency instead of managing congestion” is not the relevant mitigation. Performance and security both depend on real traffic measurements. The scenario calls for “Set monitored network capacity and QoS controls without weakening security policy”; the acceptance check is “Measure latency, jitter and packet loss under competing load”.

B:

The proposal “Give bulk backups permanent traffic priority over the latency-sensitive application” does not meet the relevant requirement because performance and security both depend on real traffic measurements. The matching remediation is “Set monitored network capacity and QoS controls without weakening security policy”.

C:

“Increase link bandwidth without measuring queue contention or defining QoS behavior” is not the relevant mitigation. Performance and security both depend on real traffic measurements. The scenario calls for “Set monitored network capacity and QoS controls without weakening security policy”; the acceptance check is “Measure latency, jitter and packet loss under competing load”.

Question 309

A latency-sensitive service suffers packet delay from uncontrolled bulk transfers. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Measure latency, jitter and packet loss under competing load
  2. Measure latency when the link is idle without introducing bulk-transfer competition
  3. Confirm interface throughput is high but ignore delay, jitter and loss at peak demand
  4. Inspect QoS configuration syntax without verifying observed per-class service behavior

Explanation

Correct Answer

A:

Performance and security both depend on real traffic measurements. The result of the remedy is checked directly: Measure latency, jitter and packet loss under competing load.

Incorrect Answers

B:

Performance and security both depend on real traffic measurements. The proposed check, “Measure latency when the link is idle without introducing bulk-transfer competition”, misses the relevant outcome; “Measure latency, jitter and packet loss under competing load” tests whether the intended remedy worked.

C:

“Confirm interface throughput is high but ignore delay, jitter and loss at peak demand” does not show the required outcome: measure latency, jitter and packet loss under competing load. That test matters because performance and security both depend on real traffic measurements.

D:

Performance and security both depend on real traffic measurements. The proposed check, “Inspect QoS configuration syntax without verifying observed per-class service behavior”, misses the relevant outcome; “Measure latency, jitter and packet loss under competing load” tests whether the intended remedy worked.

Question 310

A multi-cloud environment routes sensitive service traffic through an unmanaged hub. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Add IPsec on one provider connection but allow cross-tenant traffic without segmentation
  2. Use explicit cloud routing, segmentation and authenticated encrypted service links
  3. Rely on global route propagation with no approved path or destination restrictions
  4. Route all multi-cloud services through an unmanaged hub because both providers use private IP space

Explanation

Correct Answer

B:

Hybrid and multi-cloud paths are shared-responsibility boundaries. A direct way to confirm the outcome is to trace permitted traffic and verify isolation across provider connections.

Incorrect Answers

A:

Hybrid and multi-cloud paths are shared-responsibility boundaries. “Add IPsec on one provider connection but allow cross-tenant traffic without segmentation” does not supply that control; “Use explicit cloud routing, segmentation and authenticated encrypted service links” addresses the identified gap, and “Trace permitted traffic and verify isolation across provider connections” verifies the result.

C:

Hybrid and multi-cloud paths are shared-responsibility boundaries. “Rely on global route propagation with no approved path or destination restrictions” does not supply that control; “Use explicit cloud routing, segmentation and authenticated encrypted service links” addresses the identified gap, and “Trace permitted traffic and verify isolation across provider connections” verifies the result.

D:

The security distinction is that hybrid and multi-cloud paths are shared-responsibility boundaries. “Route all multi-cloud services through an unmanaged hub because both providers use private IP space” addresses neither the required “Use explicit cloud routing, segmentation and authenticated encrypted service links” action nor its supporting evidence: “Trace permitted traffic and verify isolation across provider connections”.

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