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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 37

Question 360

The change advisory board sees a repeat risk in this case: During a predeployment review for a public-sector campus, the team discovers this design gap: a compromised endpoint attempts ARP spoofing on the staff VLAN after DHCP snooping is enabled. 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. Maintain binding consistency for statically addressed devices and trusted uplinks. Apply the same control to the public-sector campus rollout checklist.
  2. Verify edge-port and point-to-point link settings in switch templates.
  3. Audit optical connections and align UDLD mode on critical peer links.
  4. Document intended spanning-tree root placement and root-guard boundary ports.

Explanation

Correct Answer

A:

Maintain binding consistency for statically addressed devices and trusted uplinks. Apply the same control to the public-sector campus rollout checklist. This control targets the underlying design risk. DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The follow-up acceptance check remains: Forged ARP replies fail validation while legitimate endpoint ARP continues to resolve. The public-sector campus acceptance record also captures this result.

Incorrect Answers

B:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The repeat risk here is different: DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. A directly relevant preventive control is: Maintain binding consistency for statically addressed devices and trusted uplinks. Apply the same control to the public-sector campus rollout checklist.

C:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The repeat risk here is different: DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. A directly relevant preventive control is: Maintain binding consistency for statically addressed devices and trusted uplinks. Apply the same control to the public-sector campus rollout checklist.

D:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The repeat risk here is different: DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. A directly relevant preventive control is: Maintain binding consistency for statically addressed devices and trusted uplinks. Apply the same control to the public-sector campus rollout checklist.

Question 361

A design team must resolve this enterprise network problem: A research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. Which action MOST DIRECTLY meets the stated design requirement?

  1. Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.
  2. Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.
  3. Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.
  4. Apply Dynamic ARP Inspection where supported using valid DHCP snooping bindings or other authorized ARP entries.

Explanation

Correct Answer

C:

Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support. This action addresses the stated design problem. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A practical confirmation is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Incorrect Answers

A:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The actual fault is governed by a different mechanism: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The needed response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

B:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The actual fault is governed by a different mechanism: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The needed response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

D:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The actual fault is governed by a different mechanism: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The needed response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

Question 362

The design record describes this issue: A research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. Which technical principle BEST explains the design decision?

  1. DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages.
  2. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.
  3. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured.
  4. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement.

Explanation

Correct Answer

D:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The correct engineering response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support. The observable check is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Incorrect Answers

A:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. 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.

B:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The offered choice instead concerns a different principle: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. Those technical conditions are not interchangeable.

C:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The offered choice instead concerns a different principle: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. Those technical conditions are not interchangeable.

Question 363

After designing a change for the following scenario: A research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. Which acceptance observation BEST establishes the intended result?

  1. The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.
  2. The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.
  3. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.
  4. A planned uplink failure recovers within the agreed convergence objective without loops.

Explanation

Correct Answer

A:

The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement.

Incorrect Answers

B:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. In the case being tested, a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The necessary acceptance evidence is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

C:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. In the case being tested, a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The necessary acceptance evidence is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

D:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. In the case being tested, a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The necessary acceptance evidence is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Question 364

A preventive architecture review covers this situation: A research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Track PoE class and endpoint growth in access-switch capacity plans.
  2. Use explicit per-VLAN security tests before deploying VACL changes widely.
  3. Review trusted port assignments and rate limits as topology changes.
  4. Standardize EtherChannel negotiation modes and link speed settings on both ends.

Explanation

Correct Answer

B:

Use explicit per-VLAN security tests before deploying VACL changes widely. This control targets the underlying design risk. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The follow-up acceptance check remains: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Incorrect Answers

A:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The repeat risk here is different: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A directly relevant preventive control is: Use explicit per-VLAN security tests before deploying VACL changes widely.

C:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A directly relevant preventive control is: Use explicit per-VLAN security tests before deploying VACL changes widely.

D:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The repeat risk here is different: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A directly relevant preventive control is: Use explicit per-VLAN security tests before deploying VACL changes widely.

Question 365

A new campus or WAN review presents this constraint: During a predeployment review for a large research campus, the team discovers this design gap: a research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.
  2. Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.
  3. Enable supported UDLD protection on critical inter-switch fiber links.
  4. Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

Explanation

Correct Answer

D:

Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support. This action addresses the stated design problem. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A practical confirmation is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.

Incorrect Answers

A:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The actual fault is governed by a different mechanism: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The needed response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

B:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The actual fault is governed by a different mechanism: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The needed response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

C:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The actual fault is governed by a different mechanism: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The needed response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

Question 366

For this Cisco ENSLD design case: During a predeployment review for a large research campus, the team discovers this design gap: a research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement.
  2. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.
  3. UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses.
  4. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN.

Explanation

Correct Answer

A:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The correct engineering response is: Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support. The observable check is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.

Incorrect Answers

B:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The offered choice instead concerns a different principle: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. Those technical conditions are not interchangeable.

C:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The offered choice instead concerns a different principle: UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. Those technical conditions are not interchangeable.

D:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. 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.

Question 367

During acceptance testing for this network design: During a predeployment review for a large research campus, the team discovers this design gap: a research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Clients receive leases only from approved DHCP servers and rogue offers are dropped.
  2. The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.
  3. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.
  4. A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode.

Explanation

Correct Answer

B:

The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement.

Incorrect Answers

A:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. In the case being tested, a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The necessary acceptance evidence is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.

C:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. In the case being tested, a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The necessary acceptance evidence is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.

D:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The necessary acceptance evidence is: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.

Question 368

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a large research campus, the team discovers this design gap: a research VLAN needs to block traffic between two MAC-address groups even though both remain in the same routed subnet. 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. Audit MST region name, revision and VLAN mappings whenever adding switches.
  2. Document secure WoL relay permissions and disable unrestricted directed broadcasts.
  3. Use explicit per-VLAN security tests before deploying VACL changes widely. Apply the same control to the large research campus rollout checklist.
  4. Treat only verified host-facing interfaces as BPDU Guard edge ports.

Explanation

Correct Answer

C:

Use explicit per-VLAN security tests before deploying VACL changes widely. Apply the same control to the large research campus rollout checklist. This control targets the underlying design risk. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The follow-up acceptance check remains: The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional. The large research campus acceptance record also captures this result.

Incorrect Answers

A:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The repeat risk here is different: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A directly relevant preventive control is: Use explicit per-VLAN security tests before deploying VACL changes widely. Apply the same control to the large research campus rollout checklist.

B:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The repeat risk here is different: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A directly relevant preventive control is: Use explicit per-VLAN security tests before deploying VACL changes widely. Apply the same control to the large research campus rollout checklist.

D:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The repeat risk here is different: a VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. A directly relevant preventive control is: Use explicit per-VLAN security tests before deploying VACL changes widely. Apply the same control to the large research campus rollout checklist.

Question 369

A Cisco enterprise designer reviews the following scenario: Two campus sites interconnect over a routed WAN but the design extends every employee VLAN across sites. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists.
  2. Choose a hierarchical dual-hub or partial-mesh routed topology based on traffic, latency and resilience requirements.
  3. Control redistribution with route tagging, filtering and clearly defined ownership of redistributed prefixes.
  4. Use VRFs with explicit route-leak policy only for approved shared services.

Explanation

Correct Answer

A:

Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists. This action addresses the stated design problem. Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. A practical confirmation is: A local Layer 2 fault does not propagate across the site interconnect and routed applications remain reachable.

Incorrect Answers

B:

A documented hierarchy can limit topology complexity while preserving critical backup paths. The actual fault is governed by a different mechanism: Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The needed response is: Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists.

C:

Two-way redistribution can reintroduce routes into their source protocol without policy guards. The actual fault is governed by a different mechanism: Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The needed response is: Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists.

D:

VRFs maintain logically separate routing and forwarding contexts on capable shared devices. The actual fault is governed by a different mechanism: Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The needed response is: Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists.

Question 370

The network architecture board discusses the following: Two campus sites interconnect over a routed WAN but the design extends every employee VLAN across sites. Which technical principle BEST explains the design decision?

  1. Route summarization reduces upstream route detail and contains changes within appropriate campus areas.
  2. Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch.
  3. A documented hierarchy can limit topology complexity while preserving critical backup paths.
  4. Two-way redistribution can reintroduce routes into their source protocol without policy guards.

Explanation

Correct Answer

B:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The correct engineering response is: Use routed Layer 3 boundaries and local VLANs unless a justified extension requirement exists. The observable check is: A local Layer 2 fault does not propagate across the site interconnect and routed applications remain reachable.

Incorrect Answers

A:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. The offered choice instead concerns a different principle: Route summarization reduces upstream route detail and contains changes within appropriate campus areas. Those technical conditions are not interchangeable.

C:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. 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.

D:

Routing boundaries limit broadcast and spanning-tree failure domains compared with indiscriminate Layer 2 stretch. 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.