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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 53

Question 520

The change advisory board sees a repeat risk in this case: During a predeployment review for a coastal branch network, the team discovers this design gap: a multicast application must cross a provider IP network that only routes unicast between two enterprise gateways. 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. Account for tunnel MTU, routing and encryption requirements during design reviews. Apply the same control to the coastal branch network rollout checklist.
  2. Rotate credentials and test rekeying and cipher policy before production expiry.
  3. Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.
  4. Document transport trust levels separately from encryption policy and verify carrier claims.

Explanation

Correct Answer

A:

Account for tunnel MTU, routing and encryption requirements during design reviews. Apply the same control to the coastal branch network rollout checklist. This control targets the underlying design risk. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The follow-up acceptance check remains: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. The coastal branch network 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 repeat risk here is different: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. A directly relevant preventive control is: Account for tunnel MTU, routing and encryption requirements during design reviews. Apply the same control to the coastal branch network rollout checklist.

C:

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: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. A directly relevant preventive control is: Account for tunnel MTU, routing and encryption requirements during design reviews. Apply the same control to the coastal branch network 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: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. A directly relevant preventive control is: Account for tunnel MTU, routing and encryption requirements during design reviews. Apply the same control to the coastal branch network rollout checklist.

Question 521

A design team must resolve this enterprise network problem: A regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.
  2. Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.
  3. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.
  4. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.

Explanation

Correct Answer

C:

Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use. This action addresses the stated design problem. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A practical confirmation is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

Incorrect Answers

A:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The actual fault is governed by a different mechanism: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The needed response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

B:

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: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The needed response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The actual fault is governed by a different mechanism: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The needed response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

Question 522

The design record describes this issue: A regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. 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. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.
  3. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec.
  4. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.

Explanation

Correct Answer

D:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The correct engineering response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use. The observable check is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

Incorrect Answers

A:

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

B:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. 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:

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

Question 523

After designing a change for the following scenario: A regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. Which acceptance observation BEST establishes the intended result?

  1. Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.
  2. A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.
  3. End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.
  4. The branch reaches critical services over cellular when the primary circuit is disconnected.

Explanation

Correct Answer

A:

Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.

Incorrect Answers

B:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. In the case being tested, GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The necessary acceptance evidence is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

C:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. In the case being tested, GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The necessary acceptance evidence is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The necessary acceptance evidence is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

Question 524

A preventive architecture review covers this situation: A regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. 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. 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. Audit actual last-mile diversity rather than counting two circuits sharing a duct as independent.

Explanation

Correct Answer

B:

Protect group-key distribution and test key-server redundancy and rekey intervals. This control targets the underlying design risk. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The follow-up acceptance check remains: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

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: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A directly relevant preventive control is: Protect group-key distribution and test key-server redundancy and rekey intervals.

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: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A directly relevant preventive control is: Protect group-key distribution and test key-server redundancy and rekey intervals.

D:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. The repeat risk here is different: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A directly relevant preventive control is: Protect group-key distribution and test key-server redundancy and rekey intervals.

Question 525

A new campus or WAN review presents this constraint: During a predeployment review for a global retail WAN, the team discovers this design gap: a regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.
  2. Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.
  3. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  4. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

Explanation

Correct Answer

D:

Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use. This action addresses the stated design problem. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A practical confirmation is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result.

Incorrect Answers

A:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The actual fault is governed by a different mechanism: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The needed response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

B:

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: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The needed response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The needed response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

Question 526

For this Cisco ENSLD design case: During a predeployment review for a global retail WAN, the team discovers this design gap: a regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. 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. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.

Explanation

Correct Answer

A:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The correct engineering response is: Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use. The observable check is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result.

Incorrect Answers

B:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. 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.

C:

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

D:

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

Question 527

During acceptance testing for this network design: During a predeployment review for a global retail WAN, the team discovers this design gap: a regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. 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. The global retail WAN acceptance record also captures this result.
  3. Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path.
  4. A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.

Explanation

Correct Answer

B:

Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.

Incorrect Answers

A:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. In the case being tested, GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The necessary acceptance evidence is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result.

C:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. In the case being tested, GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The necessary acceptance evidence is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result.

D:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. In the case being tested, GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The necessary acceptance evidence is: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result.

Question 528

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a global retail WAN, the team discovers this design gap: a regulated company uses a private any-to-any WAN and must encrypt traffic between many sites without a full-mesh tunnel burden. 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. Document transport trust levels separately from encryption policy and verify carrier claims.
  2. Test NHRP registrations, route recursion and IPsec state under hub or ISP failure.
  3. Protect group-key distribution and test key-server redundancy and rekey intervals. Apply the same control to the global retail WAN rollout checklist.
  4. Rotate credentials and test rekeying and cipher policy before production expiry.

Explanation

Correct Answer

C:

Protect group-key distribution and test key-server redundancy and rekey intervals. Apply the same control to the global retail WAN rollout checklist. This control targets the underlying design risk. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The follow-up acceptance check remains: Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully. The global retail WAN acceptance record also captures this result.

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: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A directly relevant preventive control is: Protect group-key distribution and test key-server redundancy and rekey intervals. Apply the same control to the global retail WAN rollout checklist.

B:

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: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A directly relevant preventive control is: Protect group-key distribution and test key-server redundancy and rekey intervals. Apply the same control to the global retail WAN rollout checklist.

D:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The repeat risk here is different: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. A directly relevant preventive control is: Protect group-key distribution and test key-server redundancy and rekey intervals. Apply the same control to the global retail WAN rollout checklist.

Question 529

A Cisco enterprise designer reviews the following scenario: A design proposal assumes a carrier Layer 2 VPN automatically provides cryptographic confidentiality to all transported data. Which action MOST DIRECTLY meets the stated design requirement?

  1. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  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 OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

Explanation

Correct Answer

A:

Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted. This action addresses the stated design problem. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. A practical confirmation is: A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.

Incorrect Answers

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: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The needed response is: Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.

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: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The needed response is: Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.

D:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The actual fault is governed by a different mechanism: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The needed response is: Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.

Question 530

The network architecture board discusses the following: A design proposal assumes a carrier Layer 2 VPN automatically provides cryptographic confidentiality to all transported data. Which technical principle BEST explains the design decision?

  1. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec.
  2. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.
  3. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.
  4. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.

Explanation

Correct Answer

B:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The correct engineering response is: Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted. The observable check is: A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.

Incorrect Answers

A:

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

C:

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

D:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The offered choice instead concerns a different principle: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. Those technical conditions are not interchangeable.