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Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Cisco 300-420 Practice Test 51

Question 500

A post-incident design review discusses the following: A large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document transport trust levels separately from encryption policy and verify carrier claims.
  2. Protect group-key distribution and test key-server redundancy and rekey intervals.
  3. Account for tunnel MTU, routing and encryption requirements during design reviews.
  4. Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.

Explanation

Correct Answer

D:

Test NHRP registrations, route recursion and IPsec state under hub or ISP failure. This control targets the underlying design risk. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The follow-up acceptance check remains: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path.

Incorrect Answers

A:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The repeat risk here is different: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A directly relevant preventive control is: Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.

B:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The repeat risk here is different: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A directly relevant preventive control is: Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.

C:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The repeat risk here is different: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A directly relevant preventive control is: Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.

Question 501

During a network design workshop, the team finds this issue: During a predeployment review for a financial firm WAN, the team discovers this design gap: a large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.
  2. Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.
  3. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  4. Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

Explanation

Correct Answer

B:

Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design. This action addresses the stated design problem. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A practical confirmation is: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

A:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The actual fault is governed by a different mechanism: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The needed response is: Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.

C:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The actual fault is governed by a different mechanism: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The needed response is: Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.

D:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The actual fault is governed by a different mechanism: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The needed response is: Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.

Question 502

In a technical design review: During a predeployment review for a financial firm WAN, the team discovers this design gap: a large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.
  2. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.
  3. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec.
  4. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.

Explanation

Correct Answer

C:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The correct engineering response is: Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design. The observable check is: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

A:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The offered choice instead concerns a different principle: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. Those technical conditions are not interchangeable.

B:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The offered choice instead concerns a different principle: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. Those technical conditions are not interchangeable.

D:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The offered choice instead concerns a different principle: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. Those technical conditions are not interchangeable.

Question 503

An engineering reviewer needs objective proof for the following: During a predeployment review for a financial firm WAN, the team discovers this design gap: a large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Tunnel security associations establish and captured transport traffic does not reveal protected payloads.
  2. Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.
  3. A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.
  4. Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

Explanation

Correct Answer

D:

Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec.

Incorrect Answers

A:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. In the case being tested, DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The necessary acceptance evidence is: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

B:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. In the case being tested, DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The necessary acceptance evidence is: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

C:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. In the case being tested, DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The necessary acceptance evidence is: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

Question 504

The change advisory board sees a repeat risk in this case: During a predeployment review for a financial firm WAN, the team discovers this design gap: a large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test NHRP registrations, route recursion and IPsec state under hub or ISP failure. Apply the same control to the financial firm WAN rollout checklist.
  2. Account for tunnel MTU, routing and encryption requirements during design reviews.
  3. Rotate credentials and test rekeying and cipher policy before production expiry.
  4. Document transport trust levels separately from encryption policy and verify carrier claims.

Explanation

Correct Answer

A:

Test NHRP registrations, route recursion and IPsec state under hub or ISP failure. Apply the same control to the financial firm WAN rollout checklist. This control targets the underlying design risk. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The follow-up acceptance check remains: Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

B:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The repeat risk here is different: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A directly relevant preventive control is: Test NHRP registrations, route recursion and IPsec state under hub or ISP failure. Apply the same control to the financial firm WAN rollout checklist.

C:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The repeat risk here is different: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A directly relevant preventive control is: Test NHRP registrations, route recursion and IPsec state under hub or ISP failure. Apply the same control to the financial firm WAN rollout checklist.

D:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The repeat risk here is different: DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. A directly relevant preventive control is: Test NHRP registrations, route recursion and IPsec state under hub or ISP failure. Apply the same control to the financial firm WAN rollout checklist.

Question 505

A design team must resolve this enterprise network problem: A company needs confidentiality and integrity for site-to-site traffic across the public Internet. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.
  2. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  3. Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.
  4. Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.

Explanation

Correct Answer

C:

Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites. This action addresses the stated design problem. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. A practical confirmation is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

Incorrect Answers

A:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The actual fault is governed by a different mechanism: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The needed response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

B:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The actual fault is governed by a different mechanism: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The needed response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

D:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The actual fault is governed by a different mechanism: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The needed response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

Question 506

The design record describes this issue: A company needs confidentiality and integrity for site-to-site traffic across the public Internet. Which technical principle BEST explains the design decision?

  1. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.
  2. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.
  3. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.
  4. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.

Explanation

Correct Answer

D:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The correct engineering response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites. The observable check is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

Incorrect Answers

A:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The offered choice instead concerns a different principle: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. Those technical conditions are not interchangeable.

B:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The offered choice instead concerns a different principle: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. Those technical conditions are not interchangeable.

C:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The offered choice instead concerns a different principle: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. Those technical conditions are not interchangeable.

Question 507

After designing a change for the following scenario: A company needs confidentiality and integrity for site-to-site traffic across the public Internet. Which acceptance observation BEST establishes the intended result?

  1. Tunnel security associations establish and captured transport traffic does not reveal protected payloads.
  2. Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.
  3. A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.
  4. Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path.

Explanation

Correct Answer

A:

Tunnel security associations establish and captured transport traffic does not reveal protected payloads. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.

Incorrect Answers

B:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. In the case being tested, IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The necessary acceptance evidence is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

C:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. In the case being tested, IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The necessary acceptance evidence is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

D:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. In the case being tested, IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The necessary acceptance evidence is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

Question 508

A preventive architecture review covers this situation: A company needs confidentiality and integrity for site-to-site traffic across the public Internet. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.
  2. Rotate credentials and test rekeying and cipher policy before production expiry.
  3. Document transport trust levels separately from encryption policy and verify carrier claims.
  4. Protect group-key distribution and test key-server redundancy and rekey intervals.

Explanation

Correct Answer

B:

Rotate credentials and test rekeying and cipher policy before production expiry. This control targets the underlying design risk. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The follow-up acceptance check remains: Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

Incorrect Answers

A:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The repeat risk here is different: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. A directly relevant preventive control is: Rotate credentials and test rekeying and cipher policy before production expiry.

C:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The repeat risk here is different: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. A directly relevant preventive control is: Rotate credentials and test rekeying and cipher policy before production expiry.

D:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The repeat risk here is different: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. A directly relevant preventive control is: Rotate credentials and test rekeying and cipher policy before production expiry.

Question 509

A new campus or WAN review presents this constraint: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a company needs confidentiality and integrity for site-to-site traffic across the public Internet. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.
  2. Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.
  3. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.
  4. Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

Explanation

Correct Answer

D:

Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites. This action addresses the stated design problem. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. A practical confirmation is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The actual fault is governed by a different mechanism: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The needed response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

B:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The actual fault is governed by a different mechanism: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The needed response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

C:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The actual fault is governed by a different mechanism: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The needed response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

Question 510

For this Cisco ENSLD design case: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a company needs confidentiality and integrity for site-to-site traffic across the public Internet. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.
  2. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.
  3. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.
  4. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.

Explanation

Correct Answer

A:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The correct engineering response is: Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites. The observable check is: Tunnel security associations establish and captured transport traffic does not reveal protected payloads. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

B:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The offered choice instead concerns a different principle: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. Those technical conditions are not interchangeable.

C:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The offered choice instead concerns a different principle: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. Those technical conditions are not interchangeable.

D:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The offered choice instead concerns a different principle: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. Those technical conditions are not interchangeable.