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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 52

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.

Question 511

During acceptance testing for this network design: 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 acceptance observation BEST establishes the intended result?

  1. Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path.
  2. Tunnel security associations establish and captured transport traffic does not reveal protected payloads. The multimodal logistics WAN acceptance record also captures this result.
  3. End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.
  4. Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

Explanation

Correct Answer

B:

Tunnel security associations establish and captured transport traffic does not reveal protected payloads. The multimodal logistics WAN acceptance record also captures this result. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.

Incorrect Answers

A:

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. The multimodal logistics WAN acceptance record also captures this result.

C:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. 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. The multimodal logistics WAN acceptance record also captures this result.

D:

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. The multimodal logistics WAN acceptance record also captures this result.

Question 512

Operations wants to avoid recurrence of this design flaw: 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 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. Rotate credentials and test rekeying and cipher policy before production expiry. Apply the same control to the multimodal logistics WAN rollout checklist.
  4. Protect group-key distribution and test key-server redundancy and rekey intervals.

Explanation

Correct Answer

C:

Rotate credentials and test rekeying and cipher policy before production expiry. Apply the same control to the multimodal logistics WAN rollout checklist. 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. The multimodal logistics 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: 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. Apply the same control to the multimodal logistics 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: 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. Apply the same control to the multimodal logistics WAN rollout checklist.

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. Apply the same control to the multimodal logistics WAN rollout checklist.

Question 513

A Cisco enterprise designer reviews the following scenario: A multicast application must cross a provider IP network that only routes unicast between two enterprise gateways. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.
  2. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.
  3. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  4. Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.

Explanation

Correct Answer

A:

Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed. This action addresses the stated design problem. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. A practical confirmation is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.

Incorrect Answers

B:

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: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The needed response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

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: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The needed response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

D:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The actual fault is governed by a different mechanism: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The needed response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

Question 514

The network architecture board discusses the following: A multicast application must cross a provider IP network that only routes unicast between two enterprise gateways. 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. 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. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.

Explanation

Correct Answer

B:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The correct engineering response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed. The observable check is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.

Incorrect Answers

A:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. 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:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. 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:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The offered choice instead concerns a different principle: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. Those technical conditions are not interchangeable.

Question 515

The infrastructure team must validate this situation: A multicast application must cross a provider IP network that only routes unicast between two enterprise gateways. 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. Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

Explanation

Correct Answer

C:

End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.

Incorrect Answers

A:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. In the case being tested, GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The necessary acceptance evidence is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.

B:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. In the case being tested, GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The necessary acceptance evidence is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.

D:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. In the case being tested, GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The necessary acceptance evidence is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks.

Question 516

A post-incident design review discusses the following: A multicast application must cross a provider IP network that only routes unicast between two enterprise gateways. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Protect group-key distribution and test key-server redundancy and rekey intervals.
  2. Document transport trust levels separately from encryption policy and verify carrier claims.
  3. Rotate credentials and test rekeying and cipher policy before production expiry.
  4. Account for tunnel MTU, routing and encryption requirements during design reviews.

Explanation

Correct Answer

D:

Account for tunnel MTU, routing and encryption requirements during design reviews. 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.

Incorrect Answers

A:

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

B:

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.

C:

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.

Question 517

During a network design workshop, the team finds this issue: 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 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. Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.
  3. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  4. Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.

Explanation

Correct Answer

B:

Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed. This action addresses the stated design problem. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. A practical confirmation is: 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

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: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The needed response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

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: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The needed response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

D:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. The actual fault is governed by a different mechanism: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The needed response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed.

Question 518

In a technical design review: 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 technical principle BEST explains the design decision?

  1. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.
  2. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.
  3. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.
  4. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.

Explanation

Correct Answer

C:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The correct engineering response is: Use GRE or an appropriate multicast-capable overlay with explicit security protections if needed. The observable check is: 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

A:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. 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.

B:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. 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.

D:

GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The offered choice instead concerns a different principle: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. Those technical conditions are not interchangeable.

Question 519

An engineering reviewer needs objective proof for the following: 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 acceptance observation BEST establishes the intended result?

  1. Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path.
  2. Tunnel security associations establish and captured transport traffic does not reveal protected payloads.
  3. A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.
  4. End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. The coastal branch network acceptance record also captures this result.

Explanation

Correct Answer

D:

End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. The coastal branch network acceptance record also captures this result. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.

Incorrect Answers

A:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. In the case being tested, GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The necessary acceptance evidence is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. The coastal branch network acceptance record also captures this result.

B:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. In the case being tested, GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The necessary acceptance evidence is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. The coastal branch network 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, GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. The necessary acceptance evidence is: End-to-end multicast packets traverse the overlay and reach only authorized receiving networks. The coastal branch network acceptance record also captures this result.

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.