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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 44

Question 430

For this Cisco ENSLD design case: During a predeployment review for a medical center network, the team discovers this design gap: an organization wants several isolated business units on the same SD-Access physical fabric. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. SDA virtualization separates routing domains, while identity-based segmentation can further control communication.
  2. An SD-Access overlay depends on a stable IP underlay transporting encapsulated packets between fabric nodes.
  3. Cisco SD-Access commonly uses LISP mapping/control functions and VXLAN encapsulation to transport overlay traffic.
  4. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.

Explanation

Correct Answer

A:

SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The correct engineering response is: Use separate virtual networks and appropriate group-based policy instead of merely renaming VLANs. The observable check is: Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result.

Incorrect Answers

B:

SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The offered choice instead concerns a different principle: an SD-Access overlay depends on a stable IP underlay transporting encapsulated packets between fabric nodes. Those technical conditions are not interchangeable.

C:

SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The offered choice instead concerns a different principle: Cisco SD-Access commonly uses LISP mapping/control functions and VXLAN encapsulation to transport overlay traffic. Those technical conditions are not interchangeable.

D:

SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The offered choice instead concerns a different principle: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. Those technical conditions are not interchangeable.

Question 431

During acceptance testing for this network design: During a predeployment review for a medical center network, the team discovers this design gap: an organization wants several isolated business units on the same SD-Access physical fabric. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Fabric edge and border nodes resolve underlay paths and VXLAN test frames traverse without fragmentation faults.
  2. Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result.
  3. Endpoint registration and resolution succeed through the control plane while data packets use the expected VXLAN path.
  4. A planned uplink failure recovers within the agreed convergence objective without loops.

Explanation

Correct Answer

B:

Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result. SDA virtualization separates routing domains, while identity-based segmentation can further control communication.

Incorrect Answers

A:

An SD-Access overlay depends on a stable IP underlay transporting encapsulated packets between fabric nodes. In the case being tested, SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The necessary acceptance evidence is: Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result.

C:

Cisco SD-Access commonly uses LISP mapping/control functions and VXLAN encapsulation to transport overlay traffic. In the case being tested, SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The necessary acceptance evidence is: Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result.

D:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. In the case being tested, SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The necessary acceptance evidence is: Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result.

Question 432

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a medical center network, the team discovers this design gap: an organization wants several isolated business units on the same SD-Access physical fabric. 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 control-plane nodes and data-plane validation separately.
  2. Include underlay reachability, MTU and failure testing in fabric acceptance criteria.
  3. Maintain VN and scalable-group access policy matrices with change review. Apply the same control to the medical center network rollout checklist.
  4. Include upstream-path tracking and recovery hysteresis in gateway designs.

Explanation

Correct Answer

C:

Maintain VN and scalable-group access policy matrices with change review. Apply the same control to the medical center network rollout checklist. This control targets the underlying design risk. SDA virtualization separates routing domains, while identity-based segmentation can further control communication. The follow-up acceptance check remains: Traffic tests confirm VN isolation and permit only explicitly authorized intergroup flows. The medical center network acceptance record also captures this result.

Incorrect Answers

A:

Cisco SD-Access commonly uses LISP mapping/control functions and VXLAN encapsulation to transport overlay traffic. The repeat risk here is different: SDA virtualization separates routing domains, while identity-based segmentation can further control communication. A directly relevant preventive control is: Maintain VN and scalable-group access policy matrices with change review. Apply the same control to the medical center network rollout checklist.

B:

An SD-Access overlay depends on a stable IP underlay transporting encapsulated packets between fabric nodes. The repeat risk here is different: SDA virtualization separates routing domains, while identity-based segmentation can further control communication. A directly relevant preventive control is: Maintain VN and scalable-group access policy matrices with change review. Apply the same control to the medical center network rollout checklist.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: SDA virtualization separates routing domains, while identity-based segmentation can further control communication. A directly relevant preventive control is: Maintain VN and scalable-group access policy matrices with change review. Apply the same control to the medical center network rollout checklist.

Question 433

A Cisco enterprise designer reviews the following scenario: A branch fabric must exchange traffic with traditional non-fabric networks but the plan has no external policy boundary. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design border-node connectivity with explicit routing and segmentation handoff to external networks.
  2. Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.
  3. Model fabric node, control-plane and multicast scalability before committing the extension.
  4. Design available control-plane nodes and their capacity for endpoint-to-location mapping.

Explanation

Correct Answer

A:

Design border-node connectivity with explicit routing and segmentation handoff to external networks. This action addresses the stated design problem. An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. A practical confirmation is: Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.

Incorrect Answers

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: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The needed response is: Design border-node connectivity with explicit routing and segmentation handoff to external networks.

C:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The actual fault is governed by a different mechanism: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The needed response is: Design border-node connectivity with explicit routing and segmentation handoff to external networks.

D:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The actual fault is governed by a different mechanism: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The needed response is: Design border-node connectivity with explicit routing and segmentation handoff to external networks.

Question 434

The network architecture board discusses the following: A branch fabric must exchange traffic with traditional non-fabric networks but the plan has no external policy boundary. Which technical principle BEST explains the design decision?

  1. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN.
  2. An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric.
  3. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works.
  4. The fabric control plane tracks endpoint identity or location to guide overlay forwarding.

Explanation

Correct Answer

B:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The correct engineering response is: Design border-node connectivity with explicit routing and segmentation handoff to external networks. The observable check is: Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.

Incorrect Answers

A:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The offered choice instead concerns a different principle: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. Those technical conditions are not interchangeable.

C:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. 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.

D:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. 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.

Question 435

The infrastructure team must validate this situation: A branch fabric must exchange traffic with traditional non-fabric networks but the plan has no external policy boundary. Which acceptance observation BEST establishes the intended result?

  1. Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.
  2. Wireless endpoints receive correct segmentation and remain connected during planned controller or fabric failures.
  3. Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.
  4. Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.

Explanation

Correct Answer

C:

Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated. An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric.

Incorrect Answers

A:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. In the case being tested, an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The necessary acceptance evidence is: Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.

B:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. In the case being tested, an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The necessary acceptance evidence is: Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.

D:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. In the case being tested, an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The necessary acceptance evidence is: Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.

Question 436

A post-incident design review discusses the following: A branch fabric must exchange traffic with traditional non-fabric networks but the plan has no external policy boundary. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Include wireless fabric role and mobility tests in the overall SDA design review.
  2. Revalidate platform scale and fabric multicast design whenever adding large endpoint groups.
  3. Test control-plane redundancy and registration capacity as endpoint counts grow.
  4. Keep external routing and security handoffs in the SDA border design documentation.

Explanation

Correct Answer

D:

Keep external routing and security handoffs in the SDA border design documentation. This control targets the underlying design risk. An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The follow-up acceptance check remains: Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.

Incorrect Answers

A:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The repeat risk here is different: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. A directly relevant preventive control is: Keep external routing and security handoffs in the SDA border design documentation.

B:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. The repeat risk here is different: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. A directly relevant preventive control is: Keep external routing and security handoffs in the SDA border design documentation.

C:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The repeat risk here is different: an SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. A directly relevant preventive control is: Keep external routing and security handoffs in the SDA border design documentation.

Question 437

During a network design workshop, the team finds this issue: A fabric site needs identity mappings for devices appearing on different edge switches. Which action MOST DIRECTLY meets the stated design requirement?

  1. Choose a supported SDA fabric-wireless design with the intended WLC, AP and edge roles.
  2. Design available control-plane nodes and their capacity for endpoint-to-location mapping.
  3. Design border-node connectivity with explicit routing and segmentation handoff to external networks.
  4. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

Explanation

Correct Answer

B:

Design available control-plane nodes and their capacity for endpoint-to-location mapping. This action addresses the stated design problem. The fabric control plane tracks endpoint identity or location to guide overlay forwarding. A practical confirmation is: Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

Incorrect Answers

A:

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: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. The needed response is: Design available control-plane nodes and their capacity for endpoint-to-location mapping.

C:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. The actual fault is governed by a different mechanism: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. The needed response is: Design available control-plane nodes and their capacity for endpoint-to-location mapping.

D:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The actual fault is governed by a different mechanism: the fabric control plane tracks endpoint identity or location to guide overlay forwarding. The needed response is: Design available control-plane nodes and their capacity for endpoint-to-location mapping.

Question 438

In a technical design review: A fabric site needs identity mappings for devices appearing on different edge switches. Which technical principle BEST explains the design decision?

  1. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN.
  2. Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works.
  3. The fabric control plane tracks endpoint identity or location to guide overlay forwarding.
  4. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.

Explanation

Correct Answer

C:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The correct engineering response is: Design available control-plane nodes and their capacity for endpoint-to-location mapping. The observable check is: Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

Incorrect Answers

A:

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

B:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. 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.

D:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The offered choice instead concerns a different principle: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. Those technical conditions are not interchangeable.

Question 439

An engineering reviewer needs objective proof for the following: A fabric site needs identity mappings for devices appearing on different edge switches. Which acceptance observation BEST establishes the intended result?

  1. Test routes and permitted flows cross the border correctly, while restricted fabric segments remain isolated.
  2. Capacity testing confirms registered endpoints, replication and multicast delivery stay within supported limits.
  3. Simulated hub failure preserves required cross-campus flows within latency and convergence targets.
  4. Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

Explanation

Correct Answer

D:

Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed. The fabric control plane tracks endpoint identity or location to guide overlay forwarding.

Incorrect Answers

A:

An SDA border performs controlled connectivity between fabric virtual networks and networks outside the fabric. In the case being tested, the fabric control plane tracks endpoint identity or location to guide overlay forwarding. The necessary acceptance evidence is: Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

B:

Fabric scale limits and multicast transport behavior can constrain design even when normal unicast reachability works. In the case being tested, the fabric control plane tracks endpoint identity or location to guide overlay forwarding. The necessary acceptance evidence is: Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

C:

A documented hierarchy can limit topology complexity while preserving critical backup paths. In the case being tested, the fabric control plane tracks endpoint identity or location to guide overlay forwarding. The necessary acceptance evidence is: Registered endpoints remain discoverable after an edge-node change and paths reconverge as designed.

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.