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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 50

Question 490

The design record describes this issue: An enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. Which technical principle BEST explains the design decision?

  1. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.
  2. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  3. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  4. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.

Explanation

Correct Answer

D:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The correct engineering response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits. The observable check is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Incorrect Answers

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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.

B:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The offered choice instead concerns a different principle: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. Those technical conditions are not interchangeable.

C:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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.

Question 491

After designing a change for the following scenario: An enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. Which acceptance observation BEST establishes the intended result?

  1. Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.
  2. The branch reaches critical services over cellular when the primary circuit is disconnected.
  3. Optical power, wavelength plans and end-to-end error rates meet the physical service design.
  4. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Explanation

Correct Answer

A:

Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.

Incorrect Answers

B:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The necessary acceptance evidence is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. In the case being tested, an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The necessary acceptance evidence is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

D:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. In the case being tested, an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The necessary acceptance evidence is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Question 492

A preventive architecture review covers this situation: An enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.
  2. Maintain transport diversity and monitor per-path SLA probes before application steering changes.
  3. Check demarcation handoff, VLAN tags and carrier SLA testing at activation.
  4. Review optical budgets, amplification and protection paths with transport engineers.

Explanation

Correct Answer

B:

Maintain transport diversity and monitor per-path SLA probes before application steering changes. This control targets the underlying design risk. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The follow-up acceptance check remains: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Incorrect Answers

A:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The repeat risk here is different: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A directly relevant preventive control is: Maintain transport diversity and monitor per-path SLA probes before application steering changes.

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The repeat risk here is different: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A directly relevant preventive control is: Maintain transport diversity and monitor per-path SLA probes before application steering changes.

D:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A directly relevant preventive control is: Maintain transport diversity and monitor per-path SLA probes before application steering changes.

Question 493

A new campus or WAN review presents this constraint: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: an enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  2. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.
  3. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  4. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

Explanation

Correct Answer

D:

Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits. This action addresses the stated design problem. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A practical confirmation is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

A:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The needed response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

B:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The actual fault is governed by a different mechanism: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The needed response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

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: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The needed response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

Question 494

For this Cisco ENSLD design case: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: an enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  2. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  3. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.
  4. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.

Explanation

Correct Answer

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The correct engineering response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits. The observable check is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

B:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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.

C:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The offered choice instead concerns a different principle: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. Those technical conditions are not interchangeable.

D:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The offered choice instead concerns a different principle: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. Those technical conditions are not interchangeable.

Question 495

During acceptance testing for this network design: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: an enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Routes remain in the intended VPN and all authorized branches exchange routed traffic.
  2. Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.
  3. Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.
  4. The branch reaches critical services over cellular when the primary circuit is disconnected.

Explanation

Correct Answer

B:

Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.

Incorrect Answers

A:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. In the case being tested, an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The necessary acceptance evidence is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. In the case being tested, an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The necessary acceptance evidence is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The necessary acceptance evidence is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.

Question 496

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: an enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. 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 cellular failover, authentication, signal quality and billing controls regularly.
  2. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.
  3. Maintain transport diversity and monitor per-path SLA probes before application steering changes. Apply the same control to the regional healthcare WAN rollout checklist.
  4. Document provider VPN isolation, resiliency and route-import controls in service contracts.

Explanation

Correct Answer

C:

Maintain transport diversity and monitor per-path SLA probes before application steering changes. Apply the same control to the regional healthcare WAN rollout checklist. This control targets the underlying design risk. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The follow-up acceptance check remains: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

A:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The repeat risk here is different: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A directly relevant preventive control is: Maintain transport diversity and monitor per-path SLA probes before application steering changes. Apply the same control to the regional healthcare WAN rollout checklist.

B:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The repeat risk here is different: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A directly relevant preventive control is: Maintain transport diversity and monitor per-path SLA probes before application steering changes. Apply the same control to the regional healthcare WAN rollout checklist.

D:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The repeat risk here is different: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A directly relevant preventive control is: Maintain transport diversity and monitor per-path SLA probes before application steering changes. Apply the same control to the regional healthcare WAN rollout checklist.

Question 497

A Cisco enterprise designer reviews the following scenario: A large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. 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. Use properly negotiated route-based or policy-based IPsec tunnels with suitable modern crypto suites.
  4. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.

Explanation

Correct Answer

A:

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.

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: 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:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. 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:

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.

Question 498

The network architecture board discusses the following: A large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. 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. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec.
  3. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.
  4. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.

Explanation

Correct Answer

B:

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.

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: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. Those technical conditions are not interchangeable.

C:

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 499

The infrastructure team must validate this situation: A large hub-and-spoke WAN needs spoke-to-spoke tunnels that can form dynamically over IP transport. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

C:

Authorized spokes resolve each other’s tunnel address and exchange traffic through the expected protected path. DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec.

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, 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.

B:

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.

D:

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

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.