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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 29

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.

Question 281

A design team must resolve this enterprise network problem: A new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. 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. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.
  3. Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.
  4. Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

Explanation

Correct Answer

C:

Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths. This action addresses the stated design problem. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A practical confirmation is: A planned uplink failure recovers within the agreed convergence objective without loops.

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: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The needed response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

B:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The actual fault is governed by a different mechanism: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The needed response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

D:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The actual fault is governed by a different mechanism: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The needed response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

Question 282

The design record describes this issue: A new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. 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. Root Guard prevents a designated switch port from accepting a downstream superior-root claim.
  3. UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses.
  4. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured.

Explanation

Correct Answer

D:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The correct engineering response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths. The observable check is: A planned uplink failure recovers within the agreed convergence objective without loops.

Incorrect Answers

A:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. 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.

B:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. 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:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. 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 283

After designing a change for the following scenario: A new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. Which acceptance observation BEST establishes the intended result?

  1. A planned uplink failure recovers within the agreed convergence objective without loops.
  2. Forged ARP replies fail validation while legitimate endpoint ARP continues to resolve.
  3. A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode.
  4. The prohibited within-VLAN frame flow is blocked and unrelated permitted VLAN traffic remains functional.

Explanation

Correct Answer

A:

A planned uplink failure recovers within the agreed convergence objective without loops. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured.

Incorrect Answers

B:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. In the case being tested, RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The necessary acceptance evidence is: A planned uplink failure recovers within the agreed convergence objective without loops.

C:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The necessary acceptance evidence is: A planned uplink failure recovers within the agreed convergence objective without loops.

D:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. In the case being tested, RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The necessary acceptance evidence is: A planned uplink failure recovers within the agreed convergence objective without loops.

Question 284

A preventive architecture review covers this situation: A new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Treat only verified host-facing interfaces as BPDU Guard edge ports.
  2. Verify edge-port and point-to-point link settings in switch templates.
  3. Review trusted port assignments and rate limits as topology changes.
  4. Audit MST region name, revision and VLAN mappings whenever adding switches.

Explanation

Correct Answer

B:

Verify edge-port and point-to-point link settings in switch templates. This control targets the underlying design risk. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The follow-up acceptance check remains: A planned uplink failure recovers within the agreed convergence objective without loops.

Incorrect Answers

A:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The repeat risk here is different: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A directly relevant preventive control is: Verify edge-port and point-to-point link settings in switch templates.

C:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A directly relevant preventive control is: Verify edge-port and point-to-point link settings in switch templates.

D:

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: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A directly relevant preventive control is: Verify edge-port and point-to-point link settings in switch templates.

Question 285

A new campus or WAN review presents this constraint: During a predeployment review for a medical center network, the team discovers this design gap: a new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use Root Guard on the port where superior BPDUs must not be accepted.
  2. Enable DHCP snooping and trust only the approved server-facing paths.
  3. Use Loop Guard where appropriate to stop an expected non-designated port from transitioning to forwarding on lost BPDUs.
  4. Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

Explanation

Correct Answer

D:

Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths. This action addresses the stated design problem. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A practical confirmation is: A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result.

Incorrect Answers

A:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The actual fault is governed by a different mechanism: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The needed response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

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: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The needed response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

C:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The actual fault is governed by a different mechanism: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The needed response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

Question 286

For this Cisco ENSLD design case: During a predeployment review for a medical center network, the team discovers this design gap: a new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured.
  2. DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages.
  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

A:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The correct engineering response is: Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths. The observable check is: A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result.

Incorrect Answers

B:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The offered choice instead concerns a different principle: DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. Those technical conditions are not interchangeable.

C:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. 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.

D:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. 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 287

During acceptance testing for this network design: During a predeployment review for a medical center network, the team discovers this design gap: a new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Clients receive leases only from approved DHCP servers and rogue offers are dropped.
  2. A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result.
  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

B:

A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured.

Incorrect Answers

A:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. In the case being tested, RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The necessary acceptance evidence is: A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network 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, RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The necessary acceptance evidence is: A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result.

D:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. In the case being tested, RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The necessary acceptance evidence is: A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result.

Question 288

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a medical center network, the team discovers this design gap: a new access closet has slow convergence after uplink reconnection under an old spanning-tree mode. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Maintain binding consistency for statically addressed devices and trusted uplinks.
  2. Audit optical connections and align UDLD mode on critical peer links.
  3. Verify edge-port and point-to-point link settings in switch templates. Apply the same control to the medical center network rollout checklist.
  4. Document intended spanning-tree root placement and root-guard boundary ports.

Explanation

Correct Answer

C:

Verify edge-port and point-to-point link settings in switch templates. Apply the same control to the medical center network rollout checklist. This control targets the underlying design risk. RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The follow-up acceptance check remains: A planned uplink failure recovers within the agreed convergence objective without loops. The medical center network acceptance record also captures this result.

Incorrect Answers

A:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A directly relevant preventive control is: Verify edge-port and point-to-point link settings in switch templates. Apply the same control to the medical center network rollout checklist.

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The repeat risk here is different: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A directly relevant preventive control is: Verify edge-port and point-to-point link settings in switch templates. Apply the same control to the medical center network rollout checklist.

D:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The repeat risk here is different: RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. A directly relevant preventive control is: Verify edge-port and point-to-point link settings in switch templates. Apply the same control to the medical center network rollout checklist.

Question 289

A Cisco enterprise designer reviews the following scenario: A user-controlled switch is connected to an access port and sends superior BPDUs toward the distribution root. 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. 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. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.

Explanation

Correct Answer

A:

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.

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: 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:

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.

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: 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 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.