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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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Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

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Cisco 300-420 Practice Test 33

Question 320

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a large research campus, the team discovers this design gap: a fiber pair has one-way transmission that is invisible to an ordinary link-up indicator. 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. Document intended spanning-tree root placement and root-guard boundary ports.
  2. Maintain binding consistency for statically addressed devices and trusted uplinks.
  3. Audit optical connections and align UDLD mode on critical peer links. Apply the same control to the large research campus rollout checklist.
  4. Treat only verified host-facing interfaces as BPDU Guard edge ports.

Explanation

Correct Answer

C:

Audit optical connections and align UDLD mode on critical peer links. Apply the same control to the large research campus rollout checklist. This control targets the underlying design risk. UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The follow-up acceptance check remains: A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode. The large research campus acceptance record also captures this result.

Incorrect Answers

A:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The repeat risk here is different: UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. A directly relevant preventive control is: Audit optical connections and align UDLD mode on critical peer links. Apply the same control to the large research campus rollout checklist.

B:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. A directly relevant preventive control is: Audit optical connections and align UDLD mode on critical peer links. Apply the same control to the large research campus rollout checklist.

D:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The repeat risk here is different: UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. A directly relevant preventive control is: Audit optical connections and align UDLD mode on critical peer links. Apply the same control to the large research campus rollout checklist.

Question 321

A Cisco enterprise designer reviews the following scenario: A server-access port bundle is configured with static on mode on one side and LACP active on the other. 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 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. Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

Explanation

Correct Answer

A:

Negotiate a consistent supported LACP mode on both ends and verify member compatibility. This action addresses the stated design problem. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A practical confirmation is: All expected physical members join one logical bundle and traffic persists if a member fails.

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: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The needed response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

C:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. The actual fault is governed by a different mechanism: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The needed response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

D:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The actual fault is governed by a different mechanism: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The needed response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

Question 322

The network architecture board discusses the following: A server-access port bundle is configured with static on mode on one side and LACP active on the other. 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. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably.
  3. A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement.
  4. DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages.

Explanation

Correct Answer

B:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The correct engineering response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility. The observable check is: All expected physical members join one logical bundle and traffic persists if a member fails.

Incorrect Answers

A:

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

C:

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

D:

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

Question 323

The infrastructure team must validate this situation: A server-access port bundle is configured with static on mode on one side and LACP active on the other. Which acceptance observation BEST establishes the intended result?

  1. Clients receive leases only from approved DHCP servers and rogue offers are dropped.
  2. Authorized wake packets reach sleeping clients on the intended VLAN and unapproved broadcast exposure stays blocked.
  3. All expected physical members join one logical bundle and traffic persists if a member fails.
  4. A simulated unidirectional failure raises a UDLD event and the protection action matches the approved mode.

Explanation

Correct Answer

C:

All expected physical members join one logical bundle and traffic persists if a member fails. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably.

Incorrect Answers

A:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. In the case being tested, LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The necessary acceptance evidence is: All expected physical members join one logical bundle and traffic persists if a member fails.

B:

Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design. In the case being tested, LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The necessary acceptance evidence is: All expected physical members join one logical bundle and traffic persists if a member fails.

D:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The necessary acceptance evidence is: All expected physical members join one logical bundle and traffic persists if a member fails.

Question 324

A post-incident design review discusses the following: A server-access port bundle is configured with static on mode on one side and LACP active on the other. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document intended spanning-tree root placement and root-guard boundary ports.
  2. Use explicit per-VLAN security tests before deploying VACL changes widely.
  3. Verify edge-port and point-to-point link settings in switch templates.
  4. Standardize EtherChannel negotiation modes and link speed settings on both ends.

Explanation

Correct Answer

D:

Standardize EtherChannel negotiation modes and link speed settings on both ends. This control targets the underlying design risk. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The follow-up acceptance check remains: All expected physical members join one logical bundle and traffic persists if a member fails.

Incorrect Answers

A:

Root Guard prevents a designated switch port from accepting a downstream superior-root claim. The repeat risk here is different: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A directly relevant preventive control is: Standardize EtherChannel negotiation modes and link speed settings on both ends.

B:

A VACL can filter traffic within a VLAN independent of ordinary routed interface ACL enforcement. The repeat risk here is different: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A directly relevant preventive control is: Standardize EtherChannel negotiation modes and link speed settings on both ends.

C:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The repeat risk here is different: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A directly relevant preventive control is: Standardize EtherChannel negotiation modes and link speed settings on both ends.

Question 325

During a network design workshop, the team finds this issue: During a predeployment review for a regional distribution facility, the team discovers this design gap: a server-access port bundle is configured with static on mode on one side and LACP active on the other. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Apply Dynamic ARP Inspection where supported using valid DHCP snooping bindings or other authorized ARP entries.
  2. Negotiate a consistent supported LACP mode on both ends and verify member compatibility.
  3. Enable BPDU Guard on genuine edge ports to shut down ports that unexpectedly receive BPDUs.
  4. Enable supported UDLD protection on critical inter-switch fiber links.

Explanation

Correct Answer

B:

Negotiate a consistent supported LACP mode on both ends and verify member compatibility. This action addresses the stated design problem. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A practical confirmation is: All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility 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 actual fault is governed by a different mechanism: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The needed response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

C:

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: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The needed response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

D:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The actual fault is governed by a different mechanism: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The needed response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility.

Question 326

In a technical design review: During a predeployment review for a regional distribution facility, the team discovers this design gap: a server-access port bundle is configured with static on mode on one side and LACP active on the other. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages.
  2. Ordinary local broadcast frames do not propagate across a Layer 3 boundary without an explicit WoL relay design.
  3. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably.
  4. Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding.

Explanation

Correct Answer

C:

LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The correct engineering response is: Negotiate a consistent supported LACP mode on both ends and verify member compatibility. The observable check is: All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility 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 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.

B:

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

D:

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

Question 327

An engineering reviewer needs objective proof for the following: During a predeployment review for a regional distribution facility, the team discovers this design gap: a server-access port bundle is configured with static on mode on one side and LACP active on the other. 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. 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. The regional distribution facility acceptance record also captures this result.

Explanation

Correct Answer

D:

All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility acceptance record also captures this result. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably.

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, LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The necessary acceptance evidence is: All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility acceptance record also captures this result.

B:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. In the case being tested, LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The necessary acceptance evidence is: All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility acceptance record also captures this result.

C:

Loop Guard helps protect against unidirectional BPDU loss causing unexpected spanning-tree forwarding. In the case being tested, LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The necessary acceptance evidence is: All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility acceptance record also captures this result.

Question 328

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: a server-access port bundle is configured with static on mode on one side and LACP active on the other. 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. Standardize EtherChannel negotiation modes and link speed settings on both ends. Apply the same control to the regional distribution facility rollout checklist.
  2. Treat only verified host-facing interfaces as BPDU Guard edge ports.
  3. Review trusted port assignments and rate limits as topology changes.
  4. Audit optical connections and align UDLD mode on critical peer links.

Explanation

Correct Answer

A:

Standardize EtherChannel negotiation modes and link speed settings on both ends. Apply the same control to the regional distribution facility rollout checklist. This control targets the underlying design risk. LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. The follow-up acceptance check remains: All expected physical members join one logical bundle and traffic persists if a member fails. The regional distribution facility acceptance record also captures this result.

Incorrect Answers

B:

BPDU Guard protects an edge port from participating in an unintended bridge topology when BPDUs appear. The repeat risk here is different: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A directly relevant preventive control is: Standardize EtherChannel negotiation modes and link speed settings on both ends. Apply the same control to the regional distribution facility rollout checklist.

C:

DHCP snooping separates trusted DHCP sources from untrusted access ports and can block rogue server messages. The repeat risk here is different: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A directly relevant preventive control is: Standardize EtherChannel negotiation modes and link speed settings on both ends. Apply the same control to the regional distribution facility rollout checklist.

D:

UDLD can detect certain unidirectional Layer 2 link conditions that simple physical carrier status misses. The repeat risk here is different: LACP requires peer participation and compatible member parameters before an aggregated bundle can form reliably. A directly relevant preventive control is: Standardize EtherChannel negotiation modes and link speed settings on both ends. Apply the same control to the regional distribution facility rollout checklist.

Question 329

A design team must resolve this enterprise network problem: IP phones and access points draw more total PoE power than a new access switch’s available budget. Which action MOST DIRECTLY meets the stated design requirement?

  1. Negotiate a consistent supported LACP mode on both ends and verify member compatibility.
  2. Evaluate MST regions and appropriately scoped Layer 2 domains to improve spanning-tree scalability.
  3. Calculate aggregate PoE demand including startup spikes and choose switches with adequate supported power budgets.
  4. Provide an approved routed WoL delivery method rather than assuming a Layer 2 broadcast crosses routers automatically.

Explanation

Correct Answer

C:

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.

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: 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:

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

D:

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 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.