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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 34

Question 330

The design record describes this issue: IP phones and access points draw more total PoE power than a new access switch’s available budget. 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. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.
  3. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably.
  4. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.

Explanation

Correct Answer

D:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The correct engineering response is: Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets. The observable check is: All devices boot concurrently without power-denial events and the switch retains measurable headroom.

Incorrect Answers

A:

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

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

C:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The offered choice instead concerns a different principle: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. Those technical conditions are not interchangeable.

Question 331

After designing a change for the following scenario: IP phones and access points draw more total PoE power than a new access switch’s available budget. Which acceptance observation BEST establishes the intended result?

  1. All devices boot concurrently without power-denial events and the switch retains measurable headroom.
  2. Forged ARP replies fail validation while legitimate endpoint ARP continues to resolve.
  3. The protected port enters a root-inconsistent state upon an injected superior BPDU and recovers when it stops.
  4. The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Explanation

Correct Answer

A:

All devices boot concurrently without power-denial events and the switch retains measurable headroom. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.

Incorrect Answers

B:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. In the case being tested, Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The necessary acceptance evidence is: All devices boot concurrently without power-denial events and the switch retains measurable headroom.

C:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. In the case being tested, Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The necessary acceptance evidence is: All devices boot concurrently without power-denial events and the switch retains measurable headroom.

D:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. In the case being tested, Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The necessary acceptance evidence is: All devices boot concurrently without power-denial events and the switch retains measurable headroom.

Question 332

A preventive architecture review covers this situation: IP phones and access points draw more total PoE power than a new access switch’s available budget. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Verify edge-port and point-to-point link settings in switch templates.
  2. Track PoE class and endpoint growth in access-switch capacity plans.
  3. Pair spanning-tree protections with fiber health monitoring and UDLD where supported.
  4. Document intended spanning-tree root placement and root-guard boundary ports.

Explanation

Correct Answer

B:

Track PoE class and endpoint growth in access-switch capacity plans. This control targets the underlying design risk. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The follow-up acceptance check remains: All devices boot concurrently without power-denial events and the switch retains measurable headroom.

Incorrect Answers

A:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The repeat risk here is different: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A directly relevant preventive control is: Track PoE class and endpoint growth in access-switch capacity plans.

C:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The repeat risk here is different: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A directly relevant preventive control is: Track PoE class and endpoint growth in access-switch capacity plans.

D:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The repeat risk here is different: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A directly relevant preventive control is: Track PoE class and endpoint growth in access-switch capacity plans.

Question 333

A new campus or WAN review presents this constraint: During a predeployment review for a medical center network, the team discovers this design gap: iP phones and access points draw more total PoE power than a new access switch’s available budget. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs.
  2. Apply Dynamic ARP Inspection where supported using valid DHCP snooping bindings or other authorized ARP entries.
  3. Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.
  4. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

Explanation

Correct Answer

D:

Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets. This action addresses the stated design problem. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A practical confirmation is: All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network 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 actual fault is governed by a different mechanism: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The needed response is: Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

B:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The actual fault is governed by a different mechanism: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The needed response is: Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

C:

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: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The needed response is: Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

Question 334

For this Cisco ENSLD design case: During a predeployment review for a medical center network, the team discovers this design gap: iP phones and access points draw more total PoE power than a new access switch’s available budget. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.
  2. BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear.
  3. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.
  4. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.

Explanation

Correct Answer

A:

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The correct engineering response is: Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets. The observable check is: All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result.

Incorrect Answers

B:

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

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

Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. 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 335

During acceptance testing for this network design: During a predeployment review for a medical center network, the team discovers this design gap: iP phones and access points draw more total PoE power than a new access switch’s available budget. 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. All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result.
  3. A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode.
  4. Clients receive leases only from approved DHCP servers and rogue offers are dropped.

Explanation

Correct Answer

B:

All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.

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, Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The necessary acceptance evidence is: All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result.

C:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The necessary acceptance evidence is: All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result.

D:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. In the case being tested, Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The necessary acceptance evidence is: All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result.

Question 336

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a medical center network, the team discovers this design gap: iP phones and access points draw more total PoE power than a new access switch’s available budget. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Review trusted port assignments and rate limits as topology changes.
  2. Pair spanning-tree protections with fiber health monitoring and UDLD where supported.
  3. Track PoE class and endpoint growth in access-switch capacity plans. Apply the same control to the medical center network rollout checklist.
  4. Verify edge-port and point-to-point link settings in switch templates.

Explanation

Correct Answer

C:

Track PoE class and endpoint growth in access-switch capacity plans. Apply the same control to the medical center network rollout checklist. This control targets the underlying design risk. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. The follow-up acceptance check remains: All devices boot concurrently without power-denial events and the switch retains measurable headroom. The medical center network acceptance record also captures this result.

Incorrect Answers

A:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A directly relevant preventive control is: Track PoE class and endpoint growth in access-switch capacity plans. Apply the same control to the medical center network rollout checklist.

B:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The repeat risk here is different: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A directly relevant preventive control is: Track PoE class and endpoint growth in access-switch capacity plans. Apply the same control to the medical center network rollout checklist.

D:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The repeat risk here is different: Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints. A directly relevant preventive control is: Track PoE class and endpoint growth in access-switch capacity plans. Apply the same control to the medical center network rollout checklist.

Question 337

A Cisco enterprise designer reviews the following scenario: A remote campus must wake powered-down PCs using Wake-on-LAN packets delivered from another IP 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. Enable supported UDLD protection on critical inter-switch fiber links.
  3. Apply Dynamic ARP Inspection where supported using valid DHCP snooping bindings or other authorized ARP entries.
  4. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

Explanation

Correct Answer

A:

Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically. This action addresses the stated design problem. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. A practical confirmation is: Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.

Incorrect Answers

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The actual fault is governed by a different mechanism: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The needed response is: Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.

C:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The actual fault is governed by a different mechanism: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The needed response is: Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.

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: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The needed response is: Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.

Question 338

The network architecture board discusses the following: A remote campus must wake powered-down PCs using Wake-on-LAN packets delivered from another IP subnet. Which technical principle BEST explains the design decision?

  1. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.
  2. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.
  3. DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain.
  4. Per-port support does not guarantee the chassis can supply simultaneous power across all endpoints.

Explanation

Correct Answer

B:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The correct engineering response is: Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically. The observable check is: Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.

Incorrect Answers

A:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. 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.

C:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. 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:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. 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 339

The infrastructure team must validate this situation: A remote campus must wake powered-down PCs using Wake-on-LAN packets delivered from another IP subnet. Which acceptance observation BEST establishes the intended result?

  1. A test BPDU on the access port triggers the expected protective state while legitimate uplinks stay operational.
  2. The suspected port is held loop-inconsistent under the test condition instead of creating a forwarding loop.
  3. Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.
  4. Forged ARP replies fail validation while legitimate endpoint ARP continues to resolve.

Explanation

Correct Answer

C:

Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.

Incorrect Answers

A:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. In the case being tested, Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The necessary acceptance evidence is: Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.

B:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. In the case being tested, Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The necessary acceptance evidence is: Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.

D:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. In the case being tested, Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The necessary acceptance evidence is: Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.

Question 340

A post-incident design review discusses the following: A remote campus must wake powered-down PCs using Wake-on-LAN packets delivered from another IP subnet. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Pair spanning-tree protections with fiber health monitoring and UDLD where supported.
  2. Review trusted port assignments and rate limits as topology changes.
  3. Audit optical connections and align UDLD mode on critical peer links.
  4. Document secure WoL relay permissions and disable unrestricted directed broadcasts.

Explanation

Correct Answer

D:

Document secure WoL relay permissions and disable unrestricted directed broadcasts. This control targets the underlying design risk. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. The follow-up acceptance check remains: Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.

Incorrect Answers

A:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The repeat risk here is different: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. A directly relevant preventive control is: Document secure WoL relay permissions and disable unrestricted directed broadcasts.

B:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. A directly relevant preventive control is: Document secure WoL relay permissions and disable unrestricted directed broadcasts.

C:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The repeat risk here is different: Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. A directly relevant preventive control is: Document secure WoL relay permissions and disable unrestricted directed broadcasts.