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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 28

Question 270

For this Cisco ENSLD design case: During a predeployment review for a large research campus, the team discovers this design gap: access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.
  2. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.
  3. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.
  4. Route summarization reduces upstream route detail and contains changes within appropriate campus areas.

Explanation

Correct Answer

A:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The correct engineering response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3. The observable check is: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

Incorrect Answers

B:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. Those technical conditions are not interchangeable.

C:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. 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.

D:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. 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.

Question 271

During acceptance testing for this network design: During a predeployment review for a large research campus, the team discovers this design gap: access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.
  2. The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.
  3. Data-plane traffic remains within loss targets during a controlled route-processor switchover.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Explanation

Correct Answer

B:

The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.

Incorrect Answers

A:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. In the case being tested, Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The necessary acceptance evidence is: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

C:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The necessary acceptance evidence is: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The necessary acceptance evidence is: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

Question 272

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a large research campus, the team discovers this design gap: access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test control-plane redundancy and helper interactions during staged software upgrades.
  2. Include upstream-path tracking and recovery hysteresis in gateway designs.
  3. Verify platform multichassis features and split-brain protections before cabling changes. Apply the same control to the large research campus rollout checklist.
  4. Verify actual platform and software interoperability before relying on multivendor FHRP.

Explanation

Correct Answer

C:

Verify platform multichassis features and split-brain protections before cabling changes. Apply the same control to the large research campus rollout checklist. This control targets the underlying design risk. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The follow-up acceptance check remains: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The repeat risk here is different: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A directly relevant preventive control is: Verify platform multichassis features and split-brain protections before cabling changes. Apply the same control to the large research campus rollout checklist.

B:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A directly relevant preventive control is: Verify platform multichassis features and split-brain protections before cabling changes. Apply the same control to the large research campus rollout checklist.

D:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The repeat risk here is different: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A directly relevant preventive control is: Verify platform multichassis features and split-brain protections before cabling changes. Apply the same control to the large research campus rollout checklist.

Question 273

A Cisco enterprise designer reviews the following scenario: The enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.
  2. Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.
  3. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.
  4. Apply Dynamic ARP Inspection where supported using valid DHCP snooping bindings or other authorized ARP entries.

Explanation

Correct Answer

A:

Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability. This action addresses the stated design problem. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A practical confirmation is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

Incorrect Answers

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: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The needed response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.

C:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The actual fault is governed by a different mechanism: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The needed response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.

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: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The needed response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.

Question 274

The network architecture board discusses the following: The enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. 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. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters.
  3. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.
  4. DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain.

Explanation

Correct Answer

B:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The correct engineering response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability. The observable check is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

Incorrect Answers

A:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. 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.

C:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The offered choice instead concerns a different principle: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. Those technical conditions are not interchangeable.

D:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The offered choice instead concerns a different principle: DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. Those technical conditions are not interchangeable.

Question 275

The infrastructure team must validate this situation: The enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. Which acceptance observation BEST establishes the intended result?

  1. All devices boot concurrently without power-denial events and the switch retains measurable headroom.
  2. A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode.
  3. The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.
  4. The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Explanation

Correct Answer

C:

The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters.

Incorrect Answers

A:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. In the case being tested, MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The necessary acceptance evidence is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The necessary acceptance evidence is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

D:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. In the case being tested, MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The necessary acceptance evidence is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

Question 276

A post-incident design review discusses the following: The enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Pair spanning-tree protections with fiber health monitoring and UDLD where supported.
  2. Audit optical connections and align UDLD mode on critical peer links.
  3. Standardize EtherChannel negotiation modes and link speed settings on both ends.
  4. Audit MST region name, revision and VLAN mappings whenever adding switches.

Explanation

Correct Answer

D:

Audit MST region name, revision and VLAN mappings whenever adding switches. This control targets the underlying design risk. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The follow-up acceptance check remains: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

Incorrect Answers

A:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The repeat risk here is different: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A directly relevant preventive control is: Audit MST region name, revision and VLAN mappings whenever adding switches.

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The repeat risk here is different: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A directly relevant preventive control is: Audit MST region name, revision and VLAN mappings whenever adding switches.

C:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The repeat risk here is different: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A directly relevant preventive control is: Audit MST region name, revision and VLAN mappings whenever adding switches.

Question 277

During a network design workshop, the team finds this issue: During a predeployment review for a regional distribution facility, the team discovers this design gap: the enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.
  2. Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.
  3. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.
  4. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

Explanation

Correct Answer

B:

Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability. This action addresses the stated design problem. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A practical confirmation is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result.

Incorrect Answers

A:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The actual fault is governed by a different mechanism: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The needed response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.

C:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The actual fault is governed by a different mechanism: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The needed response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.

D:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The actual fault is governed by a different mechanism: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The needed response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.

Question 278

In a technical design review: During a predeployment review for a regional distribution facility, the team discovers this design gap: the enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.
  2. UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses.
  3. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters.
  4. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.

Explanation

Correct Answer

C:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The correct engineering response is: Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability. The observable check is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility 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 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.

B:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. 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:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. 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.

Question 279

An engineering reviewer needs objective proof for the following: During a predeployment review for a regional distribution facility, the team discovers this design gap: the enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.
  2. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.
  3. A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.
  4. The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result.

Explanation

Correct Answer

D:

The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters.

Incorrect Answers

A:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. In the case being tested, MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The necessary acceptance evidence is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result.

B:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. In the case being tested, MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The necessary acceptance evidence is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result.

C:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. In the case being tested, MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The necessary acceptance evidence is: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result.

Question 280

The change advisory board sees a repeat risk in this case: During a predeployment review for a regional distribution facility, the team discovers this design gap: the enterprise has many VLANs and relies on one common spanning-tree instance with long topology propagation effects. 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. Apply the same control to the regional distribution facility rollout checklist.
  2. Standardize EtherChannel negotiation modes and link speed settings on both ends.
  3. Document intended spanning-tree root placement and root-guard boundary ports.
  4. Maintain binding consistency for statically addressed devices and trusted uplinks.

Explanation

Correct Answer

A:

Audit MST region name, revision and VLAN mappings whenever adding switches. Apply the same control to the regional distribution facility rollout checklist. This control targets the underlying design risk. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. The follow-up acceptance check remains: The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled. The regional distribution facility acceptance record also captures this result.

Incorrect Answers

B:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The repeat risk here is different: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A directly relevant preventive control is: Audit MST region name, revision and VLAN mappings whenever adding switches. Apply the same control to the regional distribution facility rollout checklist.

C:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The repeat risk here is different: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A directly relevant preventive control is: Audit MST region name, revision and VLAN mappings whenever adding switches. Apply the same control to the regional distribution facility rollout checklist.

D:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. A directly relevant preventive control is: Audit MST region name, revision and VLAN mappings whenever adding switches. Apply the same control to the regional distribution facility rollout checklist.