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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 40

Question 390

In a technical design review: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a university has separate tenant networks that share physical core routers but must have isolated routing tables. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A documented hierarchy can limit topology complexity while preserving critical backup paths.
  2. Two-way redistribution can reintroduce routes into their source protocol without policy guards.
  3. VRFs maintain logically separate routing and forwarding contexts on capable shared devices.
  4. DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages.

Explanation

Correct Answer

C:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The correct engineering response is: Use VRFs with explicit route-leak policy only for approved shared services. The observable check is: Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result.

Incorrect Answers

A:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The offered choice instead concerns a different principle: a documented hierarchy can limit topology complexity while preserving critical backup paths. Those technical conditions are not interchangeable.

B:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The offered choice instead concerns a different principle: Two-way redistribution can reintroduce routes into their source protocol without policy guards. Those technical conditions are not interchangeable.

D:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The offered choice instead concerns a different principle: DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. Those technical conditions are not interchangeable.

Question 391

An engineering reviewer needs objective proof for the following: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a university has separate tenant networks that share physical core routers but must have isolated routing tables. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Simulated hub failure preserves required cross-campus flows within latency and convergence targets.
  2. The core retains working building aggregates without unnecessary component-prefix churn.
  3. Test prefixes appear only in approved protocols with expected tags and no persistent route oscillation.
  4. Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result.

Explanation

Correct Answer

D:

Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result. VRFs maintain logically separate routing and forwarding contexts on capable shared devices.

Incorrect Answers

A:

A documented hierarchy can limit topology complexity while preserving critical backup paths. In the case being tested, VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The necessary acceptance evidence is: Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result.

B:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. In the case being tested, VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The necessary acceptance evidence is: Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result.

C:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. In the case being tested, VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The necessary acceptance evidence is: Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result.

Question 392

The change advisory board sees a repeat risk in this case: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a university has separate tenant networks that share physical core routers but must have isolated routing tables. 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. Review cross-VRF route targets or leaks as formal security change requests. Apply the same control to the mixed-use industrial campus rollout checklist.
  2. Tie building subnet allocation rules to tested summarization policies.
  3. Maintain a centralized redistribution matrix and prevent untagged re-imports.
  4. Reassess traffic matrices and failure domains after each new campus onboarding.

Explanation

Correct Answer

A:

Review cross-VRF route targets or leaks as formal security change requests. Apply the same control to the mixed-use industrial campus rollout checklist. This control targets the underlying design risk. VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The follow-up acceptance check remains: Tenant prefixes remain isolated while selected shared-service routes appear only where authorized. The mixed-use industrial campus acceptance record also captures this result.

Incorrect Answers

B:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. The repeat risk here is different: VRFs maintain logically separate routing and forwarding contexts on capable shared devices. A directly relevant preventive control is: Review cross-VRF route targets or leaks as formal security change requests. Apply the same control to the mixed-use industrial campus rollout checklist.

C:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. The repeat risk here is different: VRFs maintain logically separate routing and forwarding contexts on capable shared devices. A directly relevant preventive control is: Review cross-VRF route targets or leaks as formal security change requests. Apply the same control to the mixed-use industrial campus rollout checklist.

D:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The repeat risk here is different: VRFs maintain logically separate routing and forwarding contexts on capable shared devices. A directly relevant preventive control is: Review cross-VRF route targets or leaks as formal security change requests. Apply the same control to the mixed-use industrial campus rollout checklist.

Question 393

A design team must resolve this enterprise network problem: A four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use VRFs with explicit route-leak policy only for approved shared services.
  2. Control redistribution with route tagging, filtering and clearly defined ownership of redistributed prefixes.
  3. Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.
  4. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

Explanation

Correct Answer

C:

Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements. This action addresses the stated design problem. A documented hierarchy can limit topology complexity while preserving critical backup paths. A practical confirmation is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets.

Incorrect Answers

A:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The actual fault is governed by a different mechanism: a documented hierarchy can limit topology complexity while preserving critical backup paths. The needed response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

B:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. The actual fault is governed by a different mechanism: a documented hierarchy can limit topology complexity while preserving critical backup paths. The needed response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

D:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The actual fault is governed by a different mechanism: a documented hierarchy can limit topology complexity while preserving critical backup paths. The needed response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

Question 394

The design record describes this issue: A four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. Which technical principle BEST explains the design decision?

  1. Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch.
  2. Two-way redistribution can reintroduce routes into their source protocol without policy guards.
  3. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.
  4. A documented hierarchy can limit topology complexity while preserving critical backup paths.

Explanation

Correct Answer

D:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The correct engineering response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements. The observable check is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets.

Incorrect Answers

A:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The offered choice instead concerns a different principle: Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. Those technical conditions are not interchangeable.

B:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The offered choice instead concerns a different principle: Two-way redistribution can reintroduce routes into their source protocol without policy guards. Those technical conditions are not interchangeable.

C:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The offered choice instead concerns a different principle: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. Those technical conditions are not interchangeable.

Question 395

After designing a change for the following scenario: A four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. Which acceptance observation BEST establishes the intended result?

  1. Simulated hub failure preserves required cross-campus flows within latency and convergence targets.
  2. A local Layer 2 fault does not propagate across the site interconnect and routed applications remain reachable.
  3. Test prefixes appear only in approved protocols with expected tags and no persistent route oscillation.
  4. Tenant prefixes remain isolated while selected shared-service routes appear only where authorized.

Explanation

Correct Answer

A:

Simulated hub failure preserves required cross-campus flows within latency and convergence targets. A documented hierarchy can limit topology complexity while preserving critical backup paths.

Incorrect Answers

B:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. In the case being tested, a documented hierarchy can limit topology complexity while preserving critical backup paths. The necessary acceptance evidence is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets.

C:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. In the case being tested, a documented hierarchy can limit topology complexity while preserving critical backup paths. The necessary acceptance evidence is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets.

D:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. In the case being tested, a documented hierarchy can limit topology complexity while preserving critical backup paths. The necessary acceptance evidence is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets.

Question 396

A preventive architecture review covers this situation: A four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Tie building subnet allocation rules to tested summarization policies.
  2. Reassess traffic matrices and failure domains after each new campus onboarding.
  3. Review each proposed VLAN extension against documented mobility or application requirements.
  4. Maintain binding consistency for statically addressed devices and trusted uplinks.

Explanation

Correct Answer

B:

Reassess traffic matrices and failure domains after each new campus onboarding. This control targets the underlying design risk. A documented hierarchy can limit topology complexity while preserving critical backup paths. The follow-up acceptance check remains: Simulated hub failure preserves required cross-campus flows within latency and convergence targets.

Incorrect Answers

A:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. The repeat risk here is different: a documented hierarchy can limit topology complexity while preserving critical backup paths. A directly relevant preventive control is: Reassess traffic matrices and failure domains after each new campus onboarding.

C:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The repeat risk here is different: a documented hierarchy can limit topology complexity while preserving critical backup paths. A directly relevant preventive control is: Reassess traffic matrices and failure domains after each new campus onboarding.

D:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: a documented hierarchy can limit topology complexity while preserving critical backup paths. A directly relevant preventive control is: Reassess traffic matrices and failure domains after each new campus onboarding.

Question 397

A new campus or WAN review presents this constraint: During a predeployment review for a new headquarters building, the team discovers this design gap: a four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Summarize routes at each building’s Layer 3 aggregation boundary using valid address plan blocks.
  2. Use VRFs with explicit route-leak policy only for approved shared services.
  3. Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists.
  4. Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

Explanation

Correct Answer

D:

Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements. This action addresses the stated design problem. A documented hierarchy can limit topology complexity while preserving critical backup paths. A practical confirmation is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.

Incorrect Answers

A:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. The actual fault is governed by a different mechanism: a documented hierarchy can limit topology complexity while preserving critical backup paths. The needed response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

B:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The actual fault is governed by a different mechanism: a documented hierarchy can limit topology complexity while preserving critical backup paths. The needed response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

C:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The actual fault is governed by a different mechanism: a documented hierarchy can limit topology complexity while preserving critical backup paths. The needed response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.

Question 398

For this Cisco ENSLD design case: During a predeployment review for a new headquarters building, the team discovers this design gap: a four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A documented hierarchy can limit topology complexity while preserving critical backup paths.
  2. Two-way redistribution can reintroduce routes into their source protocol without policy guards.
  3. VRFs maintain logically separate routing and forwarding contexts on capable shared devices.
  4. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement.

Explanation

Correct Answer

A:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The correct engineering response is: Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements. The observable check is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.

Incorrect Answers

B:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The offered choice instead concerns a different principle: Two-way redistribution can reintroduce routes into their source protocol without policy guards. Those technical conditions are not interchangeable.

C:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The offered choice instead concerns a different principle: VRFs maintain logically separate routing and forwarding contexts on capable shared devices. Those technical conditions are not interchangeable.

D:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The offered choice instead concerns a different principle: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. Those technical conditions are not interchangeable.

Question 399

During acceptance testing for this network design: During a predeployment review for a new headquarters building, the team discovers this design gap: a four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Test prefixes appear only in approved protocols with expected tags and no persistent route oscillation.
  2. Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.
  3. The core retains working building aggregates without unnecessary component-prefix churn.
  4. Tenant prefixes remain isolated while selected shared-service routes appear only where authorized.

Explanation

Correct Answer

B:

Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result. A documented hierarchy can limit topology complexity while preserving critical backup paths.

Incorrect Answers

A:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. In the case being tested, a documented hierarchy can limit topology complexity while preserving critical backup paths. The necessary acceptance evidence is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.

C:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. In the case being tested, a documented hierarchy can limit topology complexity while preserving critical backup paths. The necessary acceptance evidence is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.

D:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. In the case being tested, a documented hierarchy can limit topology complexity while preserving critical backup paths. The necessary acceptance evidence is: Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.

Question 400

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a new headquarters building, the team discovers this design gap: a four-campus network has full mesh links that cause uneven routing, expensive operations and unclear failure behavior. 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. Tie building subnet allocation rules to tested summarization policies.
  2. Review cross-VRF route targets or leaks as formal security change requests.
  3. Reassess traffic matrices and failure domains after each new campus onboarding. Apply the same control to the new headquarters building rollout checklist.
  4. Maintain a centralized redistribution matrix and prevent untagged re-imports.

Explanation

Correct Answer

C:

Reassess traffic matrices and failure domains after each new campus onboarding. Apply the same control to the new headquarters building rollout checklist. This control targets the underlying design risk. A documented hierarchy can limit topology complexity while preserving critical backup paths. The follow-up acceptance check remains: Simulated hub failure preserves required cross-campus flows within latency and convergence targets. The new headquarters building acceptance record also captures this result.

Incorrect Answers

A:

Route summarization reduces upstream route detail and contains changes within appropriate campus areas. The repeat risk here is different: a documented hierarchy can limit topology complexity while preserving critical backup paths. A directly relevant preventive control is: Reassess traffic matrices and failure domains after each new campus onboarding. Apply the same control to the new headquarters building rollout checklist.

B:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The repeat risk here is different: a documented hierarchy can limit topology complexity while preserving critical backup paths. A directly relevant preventive control is: Reassess traffic matrices and failure domains after each new campus onboarding. Apply the same control to the new headquarters building rollout checklist.

D:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. The repeat risk here is different: a documented hierarchy can limit topology complexity while preserving critical backup paths. A directly relevant preventive control is: Reassess traffic matrices and failure domains after each new campus onboarding. Apply the same control to the new headquarters building rollout checklist.