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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 45

Question 440

The change advisory board sees a repeat risk in this case: A fabric site needs identity mappings for devices appearing on different edge switches. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test control-plane redundancy and registration capacity as endpoint counts grow.
  2. Keep external routing and security handoffs in the SDA border design documentation.
  3. Include wireless fabric role and mobility tests in the overall SDA design review.
  4. Tie building subnet allocation rules to tested summarization policies.

Explanation

Correct Answer

A:

Test control-plane redundancy and registration capacity as endpoint counts grow. This control targets the underlying design risk. The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The follow-up acceptance check remains: Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

Incorrect Answers

B:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The repeat risk here is different: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. A directly relevant preventive control is: Test control-plane redundancy and registration capacity as endpoint counts grow.

C:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The repeat risk here is different: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. A directly relevant preventive control is: Test control-plane redundancy and registration capacity as endpoint counts grow.

D:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. The repeat risk here is different: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. A directly relevant preventive control is: Test control-plane redundancy and registration capacity as endpoint counts grow.

Question 441

A design team must resolve this enterprise network problem: A wireless campus proposes to treat every fabric AP like an ordinary traditional access tunnel without validating fabric wireless architecture. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design available control-plane nodes and their capacity for endpoint-to-location mapping.
  2. Design border-node connectivity with explicit routing and segmentation handoff to external networks.
  3. Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.
  4. Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

Explanation

Correct Answer

C:

Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles. This action addresses the stated design problem. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. A practical confirmation is: Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.

Incorrect Answers

A:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The actual fault is governed by a different mechanism: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The needed response is: Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.

B:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The actual fault is governed by a different mechanism: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The needed response is: Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The actual fault is governed by a different mechanism: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The needed response is: Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.

Question 442

The design record describes this issue: A wireless campus proposes to treat every fabric AP like an ordinary traditional access tunnel without validating fabric wireless architecture. Which technical principle BEST explains the design decision?

  1. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works.
  2. The fabric control plane tracks endpoint identity or location to guide overlay forwarding.
  3. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.
  4. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN.

Explanation

Correct Answer

D:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The correct engineering response is: Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles. The observable check is: Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.

Incorrect Answers

A:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The offered choice instead concerns a different principle: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. Those technical conditions are not interchangeable.

B:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The offered choice instead concerns a different principle: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. Those technical conditions are not interchangeable.

C:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The offered choice instead concerns a different principle: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. Those technical conditions are not interchangeable.

Question 443

After designing a change for the following scenario: A wireless campus proposes to treat every fabric AP like an ordinary traditional access tunnel without validating fabric wireless architecture. Which acceptance observation BEST establishes the intended result?

  1. Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.
  2. Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.
  3. Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.
  4. Data-plane traffic remains within loss targets during a controlled route-processor switchover.

Explanation

Correct Answer

A:

Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN.

Incorrect Answers

B:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. In the case being tested, Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The necessary acceptance evidence is: Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.

C:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. In the case being tested, Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The necessary acceptance evidence is: Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.

D:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The necessary acceptance evidence is: Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.

Question 444

A preventive architecture review covers this situation: A wireless campus proposes to treat every fabric AP like an ordinary traditional access tunnel without validating fabric wireless architecture. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Keep external routing and security handoffs in the SDA border design documentation.
  2. Include wireless fabric role and mobility tests in the overall SDA design review.
  3. Test control-plane redundancy and registration capacity as endpoint counts grow.
  4. Document control-plane nodes and data-plane validation separately.

Explanation

Correct Answer

B:

Include wireless fabric role and mobility tests in the overall SDA design review. This control targets the underlying design risk. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The follow-up acceptance check remains: Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.

Incorrect Answers

A:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The repeat risk here is different: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. A directly relevant preventive control is: Include wireless fabric role and mobility tests in the overall SDA design review.

C:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The repeat risk here is different: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. A directly relevant preventive control is: Include wireless fabric role and mobility tests in the overall SDA design review.

D:

Cisco SD-Access commonly uses LISP mapping/control functions and VXLAN encapsulation to transport overlay traffic. The repeat risk here is different: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. A directly relevant preventive control is: Include wireless fabric role and mobility tests in the overall SDA design review.

Question 445

A new campus or WAN review presents this constraint: A proposed SD-Access expansion doubles endpoints and adds multicast-dependent building systems without capacity analysis. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design available control-plane nodes and their capacity for endpoint-to-location mapping.
  2. Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.
  3. Negotiate a consistent supported LACP mode on both ends and verify member compatibility.
  4. Model fabric node, control-plane and multicast scalability before committing the extension.

Explanation

Correct Answer

D:

Model fabric node, control-plane and multicast scalability before committing the extension. This action addresses the stated design problem. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. A practical confirmation is: Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

Incorrect Answers

A:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The actual fault is governed by a different mechanism: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The needed response is: Model fabric node, control-plane and multicast scalability before committing the extension.

B:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The actual fault is governed by a different mechanism: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The needed response is: Model fabric node, control-plane and multicast scalability before committing the extension.

C:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The actual fault is governed by a different mechanism: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The needed response is: Model fabric node, control-plane and multicast scalability before committing the extension.

Question 446

For this Cisco ENSLD design case: A proposed SD-Access expansion doubles endpoints and adds multicast-dependent building systems without capacity analysis. Which technical principle BEST explains the design decision?

  1. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works.
  2. An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric.
  3. The fabric control plane tracks endpoint identity or location to guide overlay forwarding.
  4. SDA virtualization separates routing domains, while identity-based segmentation can further control communication.

Explanation

Correct Answer

A:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The correct engineering response is: Model fabric node, control-plane and multicast scalability before committing the extension. The observable check is: Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

Incorrect Answers

B:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The offered choice instead concerns a different principle: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. Those technical conditions are not interchangeable.

C:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The offered choice instead concerns a different principle: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. Those technical conditions are not interchangeable.

D:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The offered choice instead concerns a different principle: SDA virtualization separates routing domains, while identity-based segmentation can further control communication. Those technical conditions are not interchangeable.

Question 447

During acceptance testing for this network design: A proposed SD-Access expansion doubles endpoints and adds multicast-dependent building systems without capacity analysis. Which acceptance observation BEST establishes the intended result?

  1. Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.
  2. Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.
  3. Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Explanation

Correct Answer

B:

Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works.

Incorrect Answers

A:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. In the case being tested, Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The necessary acceptance evidence is: Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

C:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. In the case being tested, Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The necessary acceptance evidence is: Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The necessary acceptance evidence is: Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

Question 448

Operations wants to avoid recurrence of this design flaw: A proposed SD-Access expansion doubles endpoints and adds multicast-dependent building systems without capacity analysis. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Keep external routing and security handoffs in the SDA border design documentation.
  2. Include wireless fabric role and mobility tests in the overall SDA design review.
  3. Revalidate platform scale and fabric multicast design whenever adding large endpoint groups.
  4. Reassess traffic matrices and failure domains after each new campus onboarding.

Explanation

Correct Answer

C:

Revalidate platform scale and fabric multicast design whenever adding large endpoint groups. This control targets the underlying design risk. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The follow-up acceptance check remains: Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

Incorrect Answers

A:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The repeat risk here is different: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. A directly relevant preventive control is: Revalidate platform scale and fabric multicast design whenever adding large endpoint groups.

B:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The repeat risk here is different: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. A directly relevant preventive control is: Revalidate platform scale and fabric multicast design whenever adding large endpoint groups.

D:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The repeat risk here is different: Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. A directly relevant preventive control is: Revalidate platform scale and fabric multicast design whenever adding large endpoint groups.

Question 449

A Cisco enterprise designer reviews the following scenario: Two data centers must exchange native Ethernet frames transparently between locations managed by one provider. Which action MOST DIRECTLY meets the stated design requirement?

  1. Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.
  2. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.
  3. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  4. Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

Explanation

Correct Answer

A:

Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement. This action addresses the stated design problem. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A practical confirmation is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Incorrect Answers

B:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The actual fault is governed by a different mechanism: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The needed response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The needed response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

D:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The actual fault is governed by a different mechanism: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The needed response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

Question 450

The network architecture board discusses the following: Two data centers must exchange native Ethernet frames transparently between locations managed by one provider. Which technical principle BEST explains the design decision?

  1. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  2. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.
  3. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  4. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

Explanation

Correct Answer

B:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The correct engineering response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement. The observable check is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Incorrect Answers

A:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The offered choice instead concerns a different principle: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. Those technical conditions are not interchangeable.

D:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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.