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Cisco 300-420 Bundle

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 30

Question 290

The network architecture board discusses the following: A user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. Which technical principle BEST explains the design decision?

  1. DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain.
  2. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.
  3. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured.
  4. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.

Explanation

Correct Answer

B:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The correct engineering response is: Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs. The observable check is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.

Incorrect Answers

A:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. 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.

C:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. 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.

D:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. 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.

Question 291

The infrastructure team must validate this situation: A user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. Which acceptance observation BEST establishes the intended result?

  1. A planned uplink failure recovers within the agreed convergence objective without loops.
  2. All expected physical members join one logical bundle and traffic persists if a member fails.
  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.

Explanation

Correct Answer

C:

A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.

Incorrect Answers

A:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. In the case being tested, BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The necessary acceptance evidence is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.

B:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. In the case being tested, BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The necessary acceptance evidence is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.

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, BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The necessary acceptance evidence is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.

Question 292

A post-incident design review discusses the following: A user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. 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. Standardize EtherChannel negotiation modes and link speed settings on both ends.
  4. Treat only verified host-facing interfaces as BPDU Guard edge ports.

Explanation

Correct Answer

D:

Treat only verified host-facing interfaces as BPDU Guard edge ports. This control targets the underlying design risk. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The follow-up acceptance check remains: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.

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: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A directly relevant preventive control is: Treat only verified host-facing interfaces as BPDU Guard edge ports.

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: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A directly relevant preventive control is: Treat only verified host-facing interfaces as BPDU Guard edge ports.

C:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The repeat risk here is different: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A directly relevant preventive control is: Treat only verified host-facing interfaces as BPDU Guard edge ports.

Question 293

During a network design workshop, the team finds this issue: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Negotiate a consistent supported LACP mode on both ends and verify member compatibility.
  2. Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs.
  3. Enable supported UDLD protection on critical inter-switch fiber links.
  4. Use Root Guard on the port where superior BPDUs must not be accepted.

Explanation

Correct Answer

B:

Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs. This action addresses the stated design problem. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A practical confirmation is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus acceptance record also captures this result.

Incorrect Answers

A:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The actual fault is governed by a different mechanism: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The needed response is: Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive 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: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The needed response is: Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs.

D:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The actual fault is governed by a different mechanism: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The needed response is: Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs.

Question 294

In a technical design review: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. 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. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.
  3. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.
  4. UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses.

Explanation

Correct Answer

C:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The correct engineering response is: Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs. The observable check is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus acceptance record also captures this result.

Incorrect Answers

A:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. 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:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. 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:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. 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.

Question 295

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 user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. A planned uplink failure recovers within the agreed convergence objective without loops.
  2. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.
  3. Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.
  4. A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus acceptance record also captures this result.

Explanation

Correct Answer

D:

A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus acceptance record also captures this result. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.

Incorrect Answers

A:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. In the case being tested, BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The necessary acceptance evidence is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus 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, BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The necessary acceptance evidence is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus 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, BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The necessary acceptance evidence is: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus acceptance record also captures this result.

Question 296

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 user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. 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. Treat only verified host-facing interfaces as BPDU Guard edge ports. Apply the same control to the mixed-use industrial campus rollout checklist.
  2. Document secure WoL relay permissions and disable unrestricted directed broadcasts.
  3. Standardize EtherChannel negotiation modes and link speed settings on both ends.
  4. Maintain binding consistency for statically addressed devices and trusted uplinks.

Explanation

Correct Answer

A:

Treat only verified host-facing interfaces as BPDU Guard edge ports. Apply the same control to the mixed-use industrial campus rollout checklist. This control targets the underlying design risk. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The follow-up acceptance check remains: A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational. The mixed-use industrial campus acceptance record also captures this result.

Incorrect Answers

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: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A directly relevant preventive control is: Treat only verified host-facing interfaces as BPDU Guard edge ports. Apply the same control to the mixed-use industrial campus rollout checklist.

C:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The repeat risk here is different: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A directly relevant preventive control is: Treat only verified host-facing interfaces as BPDU Guard edge ports. Apply the same control to the mixed-use industrial campus rollout checklist.

D:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. A directly relevant preventive control is: Treat only verified host-facing interfaces as BPDU Guard edge ports. Apply the same control to the mixed-use industrial campus rollout checklist.

Question 297

A design team must resolve this enterprise network problem: An unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. 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. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.
  3. Use Root Guard on the port where superior BPDUs must not be accepted.
  4. Apply Dynamic ARP Inspection where supported using valid DHCP snooping bindings or other authorized ARP entries.

Explanation

Correct Answer

C:

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.

Incorrect Answers

A:

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.

B:

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.

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: 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 298

The design record describes this issue: An unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. Which technical principle BEST explains the design decision?

  1. DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain.
  2. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.
  3. UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses.
  4. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.

Explanation

Correct Answer

D:

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.

Incorrect Answers

A:

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

B:

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.

C:

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

Question 299

After designing a change for the following scenario: An unmanaged downstream switch attempts to become root over a legitimate switch-to-switch access-facing link. Which acceptance observation BEST establishes the intended result?

  1. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.
  2. The expected MST instances carry the assigned VLAN groups and topology-change rates remain controlled.
  3. All devices boot concurrently without power-denial events and the switch retains measurable headroom.
  4. All expected physical members join one logical bundle and traffic persists if a member fails.

Explanation

Correct Answer

A:

The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.

Incorrect Answers

B:

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.

C:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. 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.

D:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. 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.

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.