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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 31

Question 300

A preventive architecture review covers this situation: An unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Maintain binding consistency for statically addressed devices and trusted uplinks.
  2. Document intended spanning-tree root placement and root-guard boundary ports.
  3. Review trusted port assignments and rate limits as topology changes.
  4. Treat only verified host-facing interfaces as BPDU Guard edge ports.

Explanation

Correct Answer

B:

Document intended spanning-tree root placement and root-guard boundary ports. This control targets the underlying design risk. Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The follow-up acceptance check remains: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.

Incorrect Answers

A:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A directly relevant preventive control is: Document intended spanning-tree root placement and root-guard boundary ports.

C:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A directly relevant preventive control is: Document intended spanning-tree root placement and root-guard boundary ports.

D:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The repeat risk here is different: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A directly relevant preventive control is: Document intended spanning-tree root placement and root-guard boundary ports.

Question 301

A new campus or WAN review presents this constraint: During a predeployment review for a new headquarters building, the team discovers this design gap: an unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.
  2. Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.
  3. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.
  4. Use Root Guard on the port where superior BPDUs must not be accepted.

Explanation

Correct Answer

D:

Use Root Guard on the port where superior BPDUs must not be accepted. This action addresses the stated design problem. Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A practical confirmation is: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.

Incorrect Answers

A:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The actual fault is governed by a different mechanism: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The needed response is: Use Root Guard on the port where superior BPDUs must not be accepted.

B:

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: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The needed response is: Use Root Guard on the port where superior BPDUs must not be accepted.

C:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The actual fault is governed by a different mechanism: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The needed response is: Use Root Guard on the port where superior BPDUs must not be accepted.

Question 302

For this Cisco ENSLD design case: During a predeployment review for a new headquarters building, the team discovers this design gap: an unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. 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. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.
  3. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.
  4. MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters.

Explanation

Correct Answer

A:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The correct engineering response is: Use Root Guard on the port where superior BPDUs must not be accepted. The observable check is: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.

Incorrect Answers

B:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. 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:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The offered choice instead concerns a different principle: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. Those technical conditions are not interchangeable.

D:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The offered choice instead concerns a different principle: MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. Those technical conditions are not interchangeable.

Question 303

During acceptance testing for this network design: During a predeployment review for a new headquarters building, the team discovers this design gap: an unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Forged ARP replies fail validation while legitimate endpoint ARP continues to resolve.
  2. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.
  3. Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.
  4. The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.

Explanation

Correct Answer

B:

The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.

Incorrect Answers

A:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. In the case being tested, Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The necessary acceptance evidence is: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.

C:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. In the case being tested, Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The necessary acceptance evidence is: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.

D:

MST can map multiple VLANs to a smaller set of spanning-tree instances while Layer 2 domain size still matters. In the case being tested, Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The necessary acceptance evidence is: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.

Question 304

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a new headquarters building, the team discovers this design gap: an unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. 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. Track PoE class and endpoint growth in access-switch capacity plans.
  2. Audit optical connections and align UDLD mode on critical peer links.
  3. Document intended spanning-tree root placement and root-guard boundary ports. Apply the same control to the new headquarters building rollout checklist.
  4. Review trusted port assignments and rate limits as topology changes.

Explanation

Correct Answer

C:

Document intended spanning-tree root placement and root-guard boundary ports. Apply the same control to the new headquarters building rollout checklist. This control targets the underlying design risk. Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The follow-up acceptance check remains: The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. The new headquarters building acceptance record also captures this result.

Incorrect Answers

A:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The repeat risk here is different: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A directly relevant preventive control is: Document intended spanning-tree root placement and root-guard boundary ports. Apply the same control to the new headquarters building rollout checklist.

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The repeat risk here is different: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A directly relevant preventive control is: Document intended spanning-tree root placement and root-guard boundary ports. Apply the same control to the new headquarters building rollout checklist.

D:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: Root Guard prevents a designated switch port from accepting a downstream superior-root claim. A directly relevant preventive control is: Document intended spanning-tree root placement and root-guard boundary ports. Apply the same control to the new headquarters building rollout checklist.

Question 305

A Cisco enterprise designer reviews the following scenario: A fiber uplink loses inbound BPDUs while remaining electrically up and starts forwarding in ways that risk a loop. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.
  2. Enable DHCP snooping and trust only the approved server-facing paths.
  3. Use Root Guard on the port where superior BPDUs must not be accepted.
  4. Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs.

Explanation

Correct Answer

A:

Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs. This action addresses the stated design problem. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. A practical confirmation is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.

Incorrect Answers

B:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The actual fault is governed by a different mechanism: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The needed response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

C:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The actual fault is governed by a different mechanism: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The needed response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

D:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The actual fault is governed by a different mechanism: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The needed response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

Question 306

The network architecture board discusses the following: A fiber uplink loses inbound BPDUs while remaining electrically up and starts forwarding in ways that risk a loop. Which technical principle BEST explains the design decision?

  1. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.
  2. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.
  3. DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain.
  4. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.

Explanation

Correct Answer

B:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The correct engineering response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs. The observable check is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.

Incorrect Answers

A:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. 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:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. 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.

D:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The offered choice instead concerns a different principle: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. Those technical conditions are not interchangeable.

Question 307

The infrastructure team must validate this situation: A fiber uplink loses inbound BPDUs while remaining electrically up and starts forwarding in ways that risk a loop. 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. A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode.
  3. The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.
  4. All expected physical members join one logical bundle and traffic persists if a member fails.

Explanation

Correct Answer

C:

The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.

Incorrect Answers

A:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. In the case being tested, Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The necessary acceptance evidence is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The necessary acceptance evidence is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.

D:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. In the case being tested, Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The necessary acceptance evidence is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.

Question 308

A post-incident design review discusses the following: A fiber uplink loses inbound BPDUs while remaining electrically up and starts forwarding in ways that risk a loop. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Standardize EtherChannel negotiation modes and link speed settings on both ends.
  2. Review trusted port assignments and rate limits as topology changes.
  3. Verify edge-port and point-to-point link settings in switch templates.
  4. Pair spanning-tree protections with fiber health monitoring and UDLD where supported.

Explanation

Correct Answer

D:

Pair spanning-tree protections with fiber health monitoring and UDLD where supported. This control targets the underlying design risk. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The follow-up acceptance check remains: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.

Incorrect Answers

A:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The repeat risk here is different: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. A directly relevant preventive control is: Pair spanning-tree protections with fiber health monitoring and UDLD where supported.

B:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. A directly relevant preventive control is: Pair spanning-tree protections with fiber health monitoring and UDLD where supported.

C:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The repeat risk here is different: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. A directly relevant preventive control is: Pair spanning-tree protections with fiber health monitoring and UDLD where supported.

Question 309

During a network design workshop, the team finds this issue: During a predeployment review for a public-sector campus, the team discovers this design gap: a fiber uplink loses inbound BPDUs while remaining electrically up and starts forwarding in ways that risk a loop. 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. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.
  3. Enable supported UDLD protection on critical inter-switch fiber links.
  4. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

Explanation

Correct Answer

B:

Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs. This action addresses the stated design problem. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. A practical confirmation is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop. The public-sector 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: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The needed response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

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: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The needed response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

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: Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The needed response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.

Question 310

In a technical design review: During a predeployment review for a public-sector campus, the team discovers this design gap: a fiber uplink loses inbound BPDUs while remaining electrically up and starts forwarding in ways that risk a loop. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.
  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. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.

Explanation

Correct Answer

C:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The correct engineering response is: Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs. The observable check is: The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop. The public-sector campus acceptance record also captures this result.

Incorrect Answers

A:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. 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.

B:

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

D:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The offered choice instead concerns a different principle: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. Those technical conditions are not interchangeable.