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ISC CISSP Practice Test 39

Question 380

An enterprise SD-WAN automatically selects cheap broadband routes but sensitive transactions cross untrusted links in plaintext. What should the security manager recommend as the MOST appropriate response to the current requirement?

  1. Add application-aware path selection and tested QoS objectives for real-time flows.
  2. Use verified health-aware failover and assess client caching, session state and recovery limitations.
  3. Require encrypted authenticated overlays and verify underlay path policies for protected traffic.
  4. Assume the SD-WAN controller's topology view encrypts data automatically.

Explanation

Correct Answer

C:

Dynamic route choice does not ensure payload confidentiality or endpoint identity. This directly addresses the stated situation.

Incorrect Answers

A:

This is appropriate for a later condition (Leadership imposes strict latency targets for a new video conference use case.), but it does not directly resolve the initial need. Routing performance is a separate objective from secure overlay transport.

B:

This response addresses a different condition: A network architect proposes relying only on DNS records for failover to a remote payment processor, with no application health checks. The present case requires the measure described by Require encrypted authenticated overlays and verify underlay path policies for protected traffic.

D:

Central routing intelligence is not synonymous with cryptographic transport protection. The proposal would not be defensible for this case.

Question 381

An enterprise SD-WAN automatically selects cheap broadband routes but sensitive transactions cross untrusted links in plaintext. A designer proposes: Assume the SD-WAN controller's topology view encrypts data automatically. What is the MOST significant security deficiency in this proposal?

  1. Routing performance is a separate objective from secure overlay transport.
  2. Basic routed network attachment cannot distinguish duplicate destination address ranges.
  3. Central routing intelligence is not synonymous with cryptographic transport protection.
  4. Indistinguishable routes create ambiguity and incorrect reachability.

Explanation

Correct Answer

C:

Central routing intelligence is not synonymous with cryptographic transport protection. This is the direct weakness in the proposed action.

Incorrect Answers

A:

This explains a later shift in requirements (Leadership imposes strict latency targets for a new video conference use case.), not the failure of the current proposal.

B:

This is an advantage of another design (Design selective service access or phased renumbering and avoid ambiguous routing across overlapping prefixes.), not the particular flaw of Assume the SD-WAN controller's topology view encrypts data automatically.

D:

This is a limitation elsewhere: A cloud virtual private network has several workloads using overlapping CIDR blocks after a merger. It does not explain the deficiency of the specified proposed approach.

Question 382

An enterprise SD-WAN automatically selects cheap broadband routes but sensitive transactions cross untrusted links in plaintext. The organization has now implemented this response: Require encrypted authenticated overlays and verify underlay path policies for protected traffic. Which observation would MOST directly demonstrate that the security objective was met?

  1. Packet capture shows encrypted management sessions and rejected unauthorized source segments.
  2. An approved change ticket for Require encrypted authenticated overlays and verify underlay path policies for protected traffic. without a completed verification result.
  3. Captured underlay traffic lacks readable payment content and invalid peers are rejected.
  4. Negative tests with unauthorized users on allowed source IPs return denials.

Explanation

Correct Answer

C:

Captured underlay traffic lacks readable payment content and invalid peers are rejected. This validates that dynamic route choice does not ensure payload confidentiality or endpoint identity.

Incorrect Answers

A:

This other observation is relevant to: A company uses unencrypted administrative Telnet across a shared campus network to operate core routers.

B:

An approved change without an executed test cannot prove operating effectiveness. The needed evidence is Captured underlay traffic lacks readable payment content and invalid peers are rejected.

D:

This demonstrates controls in another circumstance: A SaaS provider uses public IP filters for partner authentication even though thousands of users share NAT egress.

Question 383

A previous security situation was: An enterprise SD-WAN automatically selects cheap broadband routes but sensitive transactions cross untrusted links in plaintext. Now the requirement changes: Leadership imposes strict latency targets for a new video conference use case. Which NEW action BEST answers the changed need?

  1. Assume the SD-WAN controller's topology view encrypts data automatically.
  2. Captured underlay traffic lacks readable payment content and invalid peers are rejected.
  3. Add application-aware path selection and tested QoS objectives for real-time flows.
  4. Require encrypted authenticated overlays and verify underlay path policies for protected traffic.

Explanation

Correct Answer

C:

Routing performance is a separate objective from secure overlay transport. The revised action is Add application-aware path selection and tested QoS objectives for real-time flows.

Incorrect Answers

A:

This remains inappropriate: Central routing intelligence is not synonymous with cryptographic transport protection.

B:

This is a record of how the initial safeguard would be checked, not an action implementing the newly requested condition: Captured underlay traffic lacks readable payment content and invalid peers are rejected.

D:

This is the appropriate response to the original situation: Dynamic route choice does not ensure payload confidentiality or endpoint identity. It does not directly meet the new condition.

Question 384

A wireless enterprise deploys one SSID with a shared passphrase for employees, visitors and industrial sensors. What should the security manager recommend as the MOST appropriate response to the current requirement?

  1. Design selective service access or phased renumbering and avoid ambiguous routing across overlapping prefixes.
  2. Separate access roles and use enterprise authentication with tightly scoped IoT and guest networks.
  3. Post the common passphrase in the lobby to simplify guest onboarding.
  4. Add posture-aware BYOD onboarding and controlled application access.

Explanation

Correct Answer

B:

Shared PSKs and common network access impede individual attribution and segmentation. This directly addresses the stated situation.

Incorrect Answers

A:

This response addresses a different condition: A cloud virtual private network has several workloads using overlapping CIDR blocks after a merger. The present case requires the measure described by Separate access roles and use enterprise authentication with tightly scoped IoT and guest networks.

C:

Public secrets remove network identity assurance and expose sensitive access. The proposal would not be defensible for this case.

D:

This is appropriate for a later condition (The firm acquires personal devices for limited employee use.), but it does not directly resolve the initial need. BYOD trust needs device assessment beyond guest segregation.

Question 385

A wireless enterprise deploys one SSID with a shared passphrase for employees, visitors and industrial sensors. A designer proposes: Post the common passphrase in the lobby to simplify guest onboarding. What is the MOST significant security deficiency in this proposal?

  1. A shared external address identifies a network path, not the principal making a request.
  2. Public secrets remove network identity assurance and expose sensitive access.
  3. An unrelated user behind the same egress can gain unintended application access.
  4. BYOD trust needs device assessment beyond guest segregation.

Explanation

Correct Answer

B:

Public secrets remove network identity assurance and expose sensitive access. This is the direct weakness in the proposed action.

Incorrect Answers

A:

This is an advantage of another design (Require application-level identity and authorization, with network restrictions only as supplemental policy.), not the particular flaw of Post the common passphrase in the lobby to simplify guest onboarding.

C:

This is a limitation elsewhere: A SaaS provider uses public IP filters for partner authentication even though thousands of users share NAT egress. It does not explain the deficiency of the specified proposed approach.

D:

This explains a later shift in requirements (The firm acquires personal devices for limited employee use.), not the failure of the current proposal.

Question 386

A wireless enterprise deploys one SSID with a shared passphrase for employees, visitors and industrial sensors. The organization has now implemented this response: Separate access roles and use enterprise authentication with tightly scoped IoT and guest networks. Which observation would MOST directly demonstrate that the security objective was met?

  1. An approved change ticket for Separate access roles and use enterprise authentication with tightly scoped IoT and guest networks. without a completed verification result.
  2. Tests show guest and IoT clients cannot reach employee administration resources.
  3. A network rule review and active tests prove only approved application operations cross the boundary.
  4. A load test shows transaction response and packet-loss targets met under realistic demand.

Explanation

Correct Answer

B:

Tests show guest and IoT clients cannot reach employee administration resources. This validates that shared PSKs and common network access impede individual attribution and segmentation.

Incorrect Answers

A:

An approved change without an executed test cannot prove operating effectiveness. The needed evidence is Tests show guest and IoT clients cannot reach employee administration resources.

C:

This demonstrates controls in another circumstance: A corporation's DMZ web server has direct unrestricted access to the internal payroll database.

D:

This other observation is relevant to: A payment API suffers packet reordering and high loss during peak use across a congested carrier link.

Question 387

A previous security situation was: A wireless enterprise deploys one SSID with a shared passphrase for employees, visitors and industrial sensors. Now the requirement changes: The firm acquires personal devices for limited employee use. Which NEW action BEST answers the changed need?

  1. Tests show guest and IoT clients cannot reach employee administration resources.
  2. Add posture-aware BYOD onboarding and controlled application access.
  3. Separate access roles and use enterprise authentication with tightly scoped IoT and guest networks.
  4. Post the common passphrase in the lobby to simplify guest onboarding.

Explanation

Correct Answer

B:

BYOD trust needs device assessment beyond guest segregation. The revised action is Add posture-aware BYOD onboarding and controlled application access.

Incorrect Answers

A:

This is a record of how the initial safeguard would be checked, not an action implementing the newly requested condition: Tests show guest and IoT clients cannot reach employee administration resources.

C:

This is the appropriate response to the original situation: Shared PSKs and common network access impede individual attribution and segmentation. It does not directly meet the new condition.

D:

This remains inappropriate: Public secrets remove network identity assurance and expose sensitive access.

Question 388

A network architect proposes relying only on DNS records for failover to a remote payment processor, with no application health checks. What should the security manager recommend as the MOST appropriate response to the current requirement?

  1. Use verified health-aware failover and assess client caching, session state and recovery limitations.
  2. Assume lowering TTL to zero guarantees instantaneous sessions move safely.
  3. Add independent diverse carrier connectivity and routing failover validation.
  4. Require application-level identity and authorization, with network restrictions only as supplemental policy.

Explanation

Correct Answer

A:

DNS answers alone cannot guarantee timely application recovery or state continuity. This directly addresses the stated situation.

Incorrect Answers

B:

DNS caches and open connections may outlast record changes; state must be handled. The proposal would not be defensible for this case.

C:

This is appropriate for a later condition (Payment traffic requires resilience to loss of one datacenter network provider.), but it does not directly resolve the initial need. Upstream connectivity redundancy complements application-level endpoint failover.

D:

This response addresses a different condition: A SaaS provider uses public IP filters for partner authentication even though thousands of users share NAT egress. The present case requires the measure described by Use verified health-aware failover and assess client caching, session state and recovery limitations.

Question 389

A network architect proposes relying only on DNS records for failover to a remote payment processor, with no application health checks. A designer proposes: Assume lowering TTL to zero guarantees instantaneous sessions move safely. What is the MOST significant security deficiency in this proposal?

  1. DNS caches and open connections may outlast record changes; state must be handled.
  2. Unrestricted lateral traffic magnifies the impact of internet-facing compromise.
  3. Upstream connectivity redundancy complements application-level endpoint failover.
  4. A breached public-facing host must not inherit arbitrary access to sensitive internal systems.

Explanation

Correct Answer

A:

DNS caches and open connections may outlast record changes; state must be handled. This is the direct weakness in the proposed action.

Incorrect Answers

B:

This is a limitation elsewhere: A corporation's DMZ web server has direct unrestricted access to the internal payroll database. It does not explain the deficiency of the specified proposed approach.

C:

This explains a later shift in requirements (Payment traffic requires resilience to loss of one datacenter network provider.), not the failure of the current proposal.

D:

This is an advantage of another design (Place narrow application proxies and restricted flows across separate trust zones.), not the particular flaw of Assume lowering TTL to zero guarantees instantaneous sessions move safely.

Question 390

A network architect proposes relying only on DNS records for failover to a remote payment processor, with no application health checks. The organization has now implemented this response: Use verified health-aware failover and assess client caching, session state and recovery limitations. Which observation would MOST directly demonstrate that the security objective was met?

  1. Failure exercises measure actual client recovery and transaction integrity across endpoints.
  2. Negative tests prove identity claims are generated only by the trusted proxy and TLS paths are validated.
  3. A peer revocation test removes one branch without affecting healthy sites.
  4. An approved change ticket for Use verified health-aware failover and assess client caching, session state and recovery limitations. without a completed verification result.

Explanation

Correct Answer

A:

Failure exercises measure actual client recovery and transaction integrity across endpoints. This validates that DNS answers alone cannot guarantee timely application recovery or state continuity.

Incorrect Answers

B:

This demonstrates controls in another circumstance: A datacenter deploys a load balancer without preserving correct client identity and TLS validation to backends.

C:

This other observation is relevant to: A branch VPN is configured with a pre-shared key reused across hundreds of sites and no rotation records.

D:

An approved change without an executed test cannot prove operating effectiveness. The needed evidence is Failure exercises measure actual client recovery and transaction integrity across endpoints.

Certified Information Systems Security Professional (CISSP) Practice Tests