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Exam Code: 350-701

Exam Name Implementing and Operating Cisco Security Core Technologies

Certification Provider: Cisco

Corresponding Certifications: CCIE Security , CCNP Security

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Cisco 350-701 Practice Test 53

Question 520

During a planned service expansion at Atlas Scientific, engineers say that they resolved this finding: IKE succeeds but there are no IPsec child SAs when users send protected traffic. Which result provides the STRONGEST acceptance evidence?

  1. Corrected child SAs form and packet encryption and decryption counters increment.
  2. IKE establishes successfully and logs show compatible negotiated parameters.
  3. Protected traffic uses the intended encrypted path rather than an ordinary Internet route.
  4. Traffic from each approved subnet crosses the tunnel and unrelated networks stay blocked.

Explanation

Correct Answer

A:

Corrected child SAs form and packet encryption and decryption counters increment. This is the decisive evidence for the original problem: IKE succeeds but there are no IPsec child SAs when users send protected traffic. It verifies that the intended corrective control—Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic—works in the relevant environment; a completed change ticket alone would not prove the outcome at Atlas Scientific.

Incorrect Answers

B:

IKE establishes successfully and logs show compatible negotiated parameters. This would be relevant evidence for a different failure: An FTD site-to-site VPN shows no active IKE security association despite route reachability, usually addressed by Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. It does not demonstrate that the current problem at Atlas Scientific was resolved. The specific required evidence is: Corrected child SAs form and packet encryption and decryption counters increment.

C:

Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This would be relevant evidence for a different failure: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface, usually addressed by Correct routing and policy-based forwarding toward the appropriate protected tunnel. It does not demonstrate that the current problem at Atlas Scientific was resolved. The specific required evidence is: Corrected child SAs form and packet encryption and decryption counters increment.

D:

Traffic from each approved subnet crosses the tunnel and unrelated networks stay blocked. This would be relevant evidence for a different failure: An FTD tunnel has healthy SAs but one internal subnet cannot reach the remote peer, usually addressed by Inspect routing, protected network selectors, access control, and NAT treatment for that subnet. It does not demonstrate that the current problem at Atlas Scientific was resolved. The specific required evidence is: Corrected child SAs form and packet encryption and decryption counters increment.

Question 521

At Pinecrest Research, during a privileged access assessment, the security team is examining research data and distributed collaboration. The finding is: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. Which action BEST addresses this specific security issue?

  1. Correct routing and policy-based forwarding toward the appropriate protected tunnel.
  2. Check secure peer key agreement and effective authentication profile on both sides.
  3. Inspect routing, protected network selectors, access control, and NAT treatment for that subnet.
  4. Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy.

Explanation

Correct Answer

A:

Correct routing and policy-based forwarding toward the appropriate protected tunnel. This directly addresses the documented failure: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. For the Pinecrest Research environment, the measurable success condition is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This control targets the specific failure rather than merely changing an unrelated security setting.

Incorrect Answers

B:

Check secure peer key agreement and effective authentication profile on both sides. That action fits another problem: Site-to-site VPN negotiation repeatedly fails just after a PSK rotation. It does not directly remediate the current finding at Pinecrest Research: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. The relevant corrective control for this case is: Correct routing and policy-based forwarding toward the appropriate protected tunnel.

C:

Inspect routing, protected network selectors, access control, and NAT treatment for that subnet. That action fits another problem: An FTD tunnel has healthy SAs but one internal subnet cannot reach the remote peer. It does not directly remediate the current finding at Pinecrest Research: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. The relevant corrective control for this case is: Correct routing and policy-based forwarding toward the appropriate protected tunnel.

D:

Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. That action fits another problem: An FTD site-to-site VPN shows no active IKE security association despite route reachability. It does not directly remediate the current finding at Pinecrest Research: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. The relevant corrective control for this case is: Correct routing and policy-based forwarding toward the appropriate protected tunnel.

Question 522

At Pinecrest Research, a team reports that it corrected the following problem affecting research data and distributed collaboration: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. Which observation BEST verifies that the correction actually worked?

  1. IKE establishes successfully and logs show compatible negotiated parameters.
  2. Protected traffic uses the intended encrypted path rather than an ordinary Internet route.
  3. Traffic from each approved subnet crosses the tunnel and unrelated networks stay blocked.
  4. Negotiation succeeds with the current credential while the old PSK remains invalid.

Explanation

Correct Answer

B:

Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This is the decisive evidence for the original problem: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. It verifies that the intended corrective control—Correct routing and policy-based forwarding toward the appropriate protected tunnel—works in the relevant environment; a completed change ticket alone would not prove the outcome at Pinecrest Research.

Incorrect Answers

A:

IKE establishes successfully and logs show compatible negotiated parameters. This would be relevant evidence for a different failure: An FTD site-to-site VPN shows no active IKE security association despite route reachability, usually addressed by Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. It does not demonstrate that the current problem at Pinecrest Research was resolved. The specific required evidence is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

C:

Traffic from each approved subnet crosses the tunnel and unrelated networks stay blocked. This would be relevant evidence for a different failure: An FTD tunnel has healthy SAs but one internal subnet cannot reach the remote peer, usually addressed by Inspect routing, protected network selectors, access control, and NAT treatment for that subnet. It does not demonstrate that the current problem at Pinecrest Research was resolved. The specific required evidence is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

D:

Negotiation succeeds with the current credential while the old PSK remains invalid. This would be relevant evidence for a different failure: Site-to-site VPN negotiation repeatedly fails just after a PSK rotation, usually addressed by Check secure peer key agreement and effective authentication profile on both sides. It does not demonstrate that the current problem at Pinecrest Research was resolved. The specific required evidence is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

Question 523

A security engineer at Briarwood Property Group reviews tenant applications and facility services as part of a cross-team security policy review. The observed problem is: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. What is the BEST corrective action?

  1. Correct routing and policy-based forwarding toward the appropriate protected tunnel.
  2. Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic.
  3. Assess path MTU and MSS handling for the VPN without disabling encryption.
  4. Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy.

Explanation

Correct Answer

A:

Correct routing and policy-based forwarding toward the appropriate protected tunnel. This directly addresses the documented failure: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. For the Briarwood Property Group environment, the measurable success condition is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This control targets the specific failure rather than merely changing an unrelated security setting.

Incorrect Answers

B:

Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. That action fits another problem: IKE succeeds but there are no IPsec child SAs when users send protected traffic. It does not directly remediate the current finding at Briarwood Property Group: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. The relevant corrective control for this case is: Correct routing and policy-based forwarding toward the appropriate protected tunnel.

C:

Assess path MTU and MSS handling for the VPN without disabling encryption. That action fits another problem: A tunnel passes small pings but application sessions fail after encapsulation overhead. It does not directly remediate the current finding at Briarwood Property Group: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. The relevant corrective control for this case is: Correct routing and policy-based forwarding toward the appropriate protected tunnel.

D:

Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. That action fits another problem: An FTD site-to-site VPN shows no active IKE security association despite route reachability. It does not directly remediate the current finding at Briarwood Property Group: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. The relevant corrective control for this case is: Correct routing and policy-based forwarding toward the appropriate protected tunnel.

Question 524

During a cross-team security policy review at Briarwood Property Group, engineers say that they resolved this finding: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. Which result provides the STRONGEST acceptance evidence?

  1. An application transaction succeeds across typical payload sizes after tuning.
  2. Corrected child SAs form and packet encryption and decryption counters increment.
  3. Protected traffic uses the intended encrypted path rather than an ordinary Internet route.
  4. IKE establishes successfully and logs show compatible negotiated parameters.

Explanation

Correct Answer

C:

Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This is the decisive evidence for the original problem: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. It verifies that the intended corrective control—Correct routing and policy-based forwarding toward the appropriate protected tunnel—works in the relevant environment; a completed change ticket alone would not prove the outcome at Briarwood Property Group.

Incorrect Answers

A:

An application transaction succeeds across typical payload sizes after tuning. This would be relevant evidence for a different failure: A tunnel passes small pings but application sessions fail after encapsulation overhead, usually addressed by Assess path MTU and MSS handling for the VPN without disabling encryption. It does not demonstrate that the current problem at Briarwood Property Group was resolved. The specific required evidence is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

B:

Corrected child SAs form and packet encryption and decryption counters increment. This would be relevant evidence for a different failure: IKE succeeds but there are no IPsec child SAs when users send protected traffic, usually addressed by Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. It does not demonstrate that the current problem at Briarwood Property Group was resolved. The specific required evidence is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

D:

IKE establishes successfully and logs show compatible negotiated parameters. This would be relevant evidence for a different failure: An FTD site-to-site VPN shows no active IKE security association despite route reachability, usually addressed by Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. It does not demonstrate that the current problem at Briarwood Property Group was resolved. The specific required evidence is: Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

Question 525

At Maple Creek Agriculture, during an application modernization project, the security team is examining farm operations and logistics analytics. The finding is: A tunnel passes small pings but application sessions fail after encapsulation overhead. Which action BEST addresses this specific security issue?

  1. Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy.
  2. Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic.
  3. Inspect routing, protected network selectors, access control, and NAT treatment for that subnet.
  4. Assess path MTU and MSS handling for the VPN without disabling encryption.

Explanation

Correct Answer

D:

Assess path MTU and MSS handling for the VPN without disabling encryption. This directly addresses the documented failure: A tunnel passes small pings but application sessions fail after encapsulation overhead. For the Maple Creek Agriculture environment, the measurable success condition is: An application transaction succeeds across typical payload sizes after tuning. This control targets the specific failure rather than merely changing an unrelated security setting.

Incorrect Answers

A:

Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. That action fits another problem: An FTD site-to-site VPN shows no active IKE security association despite route reachability. It does not directly remediate the current finding at Maple Creek Agriculture: A tunnel passes small pings but application sessions fail after encapsulation overhead. The relevant corrective control for this case is: Assess path MTU and MSS handling for the VPN without disabling encryption.

B:

Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. That action fits another problem: IKE succeeds but there are no IPsec child SAs when users send protected traffic. It does not directly remediate the current finding at Maple Creek Agriculture: A tunnel passes small pings but application sessions fail after encapsulation overhead. The relevant corrective control for this case is: Assess path MTU and MSS handling for the VPN without disabling encryption.

C:

Inspect routing, protected network selectors, access control, and NAT treatment for that subnet. That action fits another problem: An FTD tunnel has healthy SAs but one internal subnet cannot reach the remote peer. It does not directly remediate the current finding at Maple Creek Agriculture: A tunnel passes small pings but application sessions fail after encapsulation overhead. The relevant corrective control for this case is: Assess path MTU and MSS handling for the VPN without disabling encryption.

Question 526

At Maple Creek Agriculture, a team reports that it corrected the following problem affecting farm operations and logistics analytics: A tunnel passes small pings but application sessions fail after encapsulation overhead. Which observation BEST verifies that the correction actually worked?

  1. IKE establishes successfully and logs show compatible negotiated parameters.
  2. Traffic from each approved subnet crosses the tunnel and unrelated networks stay blocked.
  3. Corrected child SAs form and packet encryption and decryption counters increment.
  4. An application transaction succeeds across typical payload sizes after tuning.

Explanation

Correct Answer

D:

An application transaction succeeds across typical payload sizes after tuning. This is the decisive evidence for the original problem: A tunnel passes small pings but application sessions fail after encapsulation overhead. It verifies that the intended corrective control—Assess path MTU and MSS handling for the VPN without disabling encryption—works in the relevant environment; a completed change ticket alone would not prove the outcome at Maple Creek Agriculture.

Incorrect Answers

A:

IKE establishes successfully and logs show compatible negotiated parameters. This would be relevant evidence for a different failure: An FTD site-to-site VPN shows no active IKE security association despite route reachability, usually addressed by Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. It does not demonstrate that the current problem at Maple Creek Agriculture was resolved. The specific required evidence is: An application transaction succeeds across typical payload sizes after tuning.

B:

Traffic from each approved subnet crosses the tunnel and unrelated networks stay blocked. This would be relevant evidence for a different failure: An FTD tunnel has healthy SAs but one internal subnet cannot reach the remote peer, usually addressed by Inspect routing, protected network selectors, access control, and NAT treatment for that subnet. It does not demonstrate that the current problem at Maple Creek Agriculture was resolved. The specific required evidence is: An application transaction succeeds across typical payload sizes after tuning.

C:

Corrected child SAs form and packet encryption and decryption counters increment. This would be relevant evidence for a different failure: IKE succeeds but there are no IPsec child SAs when users send protected traffic, usually addressed by Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. It does not demonstrate that the current problem at Maple Creek Agriculture was resolved. The specific required evidence is: An application transaction succeeds across typical payload sizes after tuning.

Question 527

A security engineer at Sapphire Data Systems reviews customer tenant services and cloud infrastructure as part of a privileged access assessment. The observed problem is: A tunnel passes small pings but application sessions fail after encapsulation overhead. What is the BEST corrective action?

  1. Assess path MTU and MSS handling for the VPN without disabling encryption.
  2. Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic.
  3. Correct routing and policy-based forwarding toward the appropriate protected tunnel.
  4. Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec.

Explanation

Correct Answer

A:

Assess path MTU and MSS handling for the VPN without disabling encryption. This directly addresses the documented failure: A tunnel passes small pings but application sessions fail after encapsulation overhead. For the Sapphire Data Systems environment, the measurable success condition is: An application transaction succeeds across typical payload sizes after tuning. This control targets the specific failure rather than merely changing an unrelated security setting.

Incorrect Answers

B:

Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. That action fits another problem: IKE succeeds but there are no IPsec child SAs when users send protected traffic. It does not directly remediate the current finding at Sapphire Data Systems: A tunnel passes small pings but application sessions fail after encapsulation overhead. The relevant corrective control for this case is: Assess path MTU and MSS handling for the VPN without disabling encryption.

C:

Correct routing and policy-based forwarding toward the appropriate protected tunnel. That action fits another problem: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. It does not directly remediate the current finding at Sapphire Data Systems: A tunnel passes small pings but application sessions fail after encapsulation overhead. The relevant corrective control for this case is: Assess path MTU and MSS handling for the VPN without disabling encryption.

D:

Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec. That action fits another problem: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. It does not directly remediate the current finding at Sapphire Data Systems: A tunnel passes small pings but application sessions fail after encapsulation overhead. The relevant corrective control for this case is: Assess path MTU and MSS handling for the VPN without disabling encryption.

Question 528

During a privileged access assessment at Sapphire Data Systems, engineers say that they resolved this finding: A tunnel passes small pings but application sessions fail after encapsulation overhead. Which result provides the STRONGEST acceptance evidence?

  1. The VPN remains established through NAT with reliable bidirectional protected flows.
  2. An application transaction succeeds across typical payload sizes after tuning.
  3. Corrected child SAs form and packet encryption and decryption counters increment.
  4. Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

Explanation

Correct Answer

B:

An application transaction succeeds across typical payload sizes after tuning. This is the decisive evidence for the original problem: A tunnel passes small pings but application sessions fail after encapsulation overhead. It verifies that the intended corrective control—Assess path MTU and MSS handling for the VPN without disabling encryption—works in the relevant environment; a completed change ticket alone would not prove the outcome at Sapphire Data Systems.

Incorrect Answers

A:

The VPN remains established through NAT with reliable bidirectional protected flows. This would be relevant evidence for a different failure: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address, usually addressed by Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec. It does not demonstrate that the current problem at Sapphire Data Systems was resolved. The specific required evidence is: An application transaction succeeds across typical payload sizes after tuning.

C:

Corrected child SAs form and packet encryption and decryption counters increment. This would be relevant evidence for a different failure: IKE succeeds but there are no IPsec child SAs when users send protected traffic, usually addressed by Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. It does not demonstrate that the current problem at Sapphire Data Systems was resolved. The specific required evidence is: An application transaction succeeds across typical payload sizes after tuning.

D:

Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This would be relevant evidence for a different failure: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface, usually addressed by Correct routing and policy-based forwarding toward the appropriate protected tunnel. It does not demonstrate that the current problem at Sapphire Data Systems was resolved. The specific required evidence is: An application transaction succeeds across typical payload sizes after tuning.

Question 529

At Seabright Municipal Works, during a scheduled security controls review, the security team is examining public service networks and records. The finding is: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. Which action BEST addresses this specific security issue?

  1. Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic.
  2. Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy.
  3. Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec.
  4. Correct routing and policy-based forwarding toward the appropriate protected tunnel.

Explanation

Correct Answer

C:

Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec. This directly addresses the documented failure: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. For the Seabright Municipal Works environment, the measurable success condition is: The VPN remains established through NAT with reliable bidirectional protected flows. This control targets the specific failure rather than merely changing an unrelated security setting.

Incorrect Answers

A:

Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. That action fits another problem: IKE succeeds but there are no IPsec child SAs when users send protected traffic. It does not directly remediate the current finding at Seabright Municipal Works: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. The relevant corrective control for this case is: Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec.

B:

Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. That action fits another problem: An FTD site-to-site VPN shows no active IKE security association despite route reachability. It does not directly remediate the current finding at Seabright Municipal Works: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. The relevant corrective control for this case is: Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec.

D:

Correct routing and policy-based forwarding toward the appropriate protected tunnel. That action fits another problem: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface. It does not directly remediate the current finding at Seabright Municipal Works: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. The relevant corrective control for this case is: Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec.

Question 530

At Seabright Municipal Works, a team reports that it corrected the following problem affecting public service networks and records: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. Which observation BEST verifies that the correction actually worked?

  1. IKE establishes successfully and logs show compatible negotiated parameters.
  2. Corrected child SAs form and packet encryption and decryption counters increment.
  3. The VPN remains established through NAT with reliable bidirectional protected flows.
  4. Protected traffic uses the intended encrypted path rather than an ordinary Internet route.

Explanation

Correct Answer

C:

The VPN remains established through NAT with reliable bidirectional protected flows. This is the decisive evidence for the original problem: A tunnel drops traffic only when behind a NAT device that changes the peer's translated address. It verifies that the intended corrective control—Verify NAT traversal configuration and peer reachability for UDP-encapsulated IPsec—works in the relevant environment; a completed change ticket alone would not prove the outcome at Seabright Municipal Works.

Incorrect Answers

A:

IKE establishes successfully and logs show compatible negotiated parameters. This would be relevant evidence for a different failure: An FTD site-to-site VPN shows no active IKE security association despite route reachability, usually addressed by Inspect IKE proposals, peer identity, authentication, and exchange logs before changing data-plane policy. It does not demonstrate that the current problem at Seabright Municipal Works was resolved. The specific required evidence is: The VPN remains established through NAT with reliable bidirectional protected flows.

B:

Corrected child SAs form and packet encryption and decryption counters increment. This would be relevant evidence for a different failure: IKE succeeds but there are no IPsec child SAs when users send protected traffic, usually addressed by Compare IPsec proposals, traffic selectors, PFS settings, and the actual interesting traffic. It does not demonstrate that the current problem at Seabright Municipal Works was resolved. The specific required evidence is: The VPN remains established through NAT with reliable bidirectional protected flows.

D:

Protected traffic uses the intended encrypted path rather than an ordinary Internet route. This would be relevant evidence for a different failure: Tunnel SAs exist but packets reach a wrong next hop instead of the VPN egress interface, usually addressed by Correct routing and policy-based forwarding toward the appropriate protected tunnel. It does not demonstrate that the current problem at Seabright Municipal Works was resolved. The specific required evidence is: The VPN remains established through NAT with reliable bidirectional protected flows.