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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 27

Question 260

A post-incident design review discusses the following: BGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Include upstream-path tracking and recovery hysteresis in gateway designs.
  2. Verify platform multichassis features and split-brain protections before cabling changes.
  3. Maintain binding consistency for statically addressed devices and trusted uplinks.
  4. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.

Explanation

Correct Answer

D:

Set realistic BFD detection timers and avoid destabilizing CPU or marginal links. This control targets the underlying design risk. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The follow-up acceptance check remains: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Incorrect Answers

A:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A directly relevant preventive control is: Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.

B:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The repeat risk here is different: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A directly relevant preventive control is: Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.

C:

DAI checks ARP packet bindings to reduce ARP spoofing within the Layer 2 broadcast domain. The repeat risk here is different: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A directly relevant preventive control is: Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.

Question 261

During a network design workshop, the team finds this issue: During a predeployment review for a public-sector campus, the team discovers this design gap: bGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. 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 supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.
  2. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  3. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.
  4. Design available control-plane nodes and their capacity for endpoint-to-location mapping.

Explanation

Correct Answer

B:

Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed. This action addresses the stated design problem. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A practical confirmation is: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The actual fault is governed by a different mechanism: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The needed response is: Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.

C:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The actual fault is governed by a different mechanism: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The needed response is: Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.

D:

The fabric control plane tracks endpoint identity or location to guide overlay forwarding. The actual fault is governed by a different mechanism: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The needed response is: Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.

Question 262

In a technical design review: During a predeployment review for a public-sector campus, the team discovers this design gap: bGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.
  2. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.
  3. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.
  4. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.

Explanation

Correct Answer

C:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The correct engineering response is: Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed. The observable check is: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

Incorrect Answers

A:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The offered choice instead concerns a different principle: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. Those technical conditions are not interchangeable.

B:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The offered choice instead concerns a different principle: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. Those technical conditions are not interchangeable.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The offered choice instead concerns a different principle: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. Those technical conditions are not interchangeable.

Question 263

An engineering reviewer needs objective proof for the following: During a predeployment review for a public-sector campus, the team discovers this design gap: bGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. The port channel forms with valid peer identifiers and survives a single distribution-node failure.
  2. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.
  3. Client traffic continues through the surviving distribution device after the primary gateway is shut down.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

Explanation

Correct Answer

D:

Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.

Incorrect Answers

A:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. In the case being tested, BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The necessary acceptance evidence is: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

B:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. In the case being tested, BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The necessary acceptance evidence is: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

C:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. In the case being tested, BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The necessary acceptance evidence is: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

Question 264

The change advisory board sees a repeat risk in this case: During a predeployment review for a public-sector campus, the team discovers this design gap: bGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. 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. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links. Apply the same control to the public-sector campus rollout checklist.
  2. Verify actual platform and software interoperability before relying on multivendor FHRP.
  3. Include upstream-path tracking and recovery hysteresis in gateway designs.
  4. Test control-plane redundancy and helper interactions during staged software upgrades.

Explanation

Correct Answer

A:

Set realistic BFD detection timers and avoid destabilizing CPU or marginal links. Apply the same control to the public-sector campus rollout checklist. This control targets the underlying design risk. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The follow-up acceptance check remains: Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. The public-sector campus acceptance record also captures this result.

Incorrect Answers

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The repeat risk here is different: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A directly relevant preventive control is: Set realistic BFD detection timers and avoid destabilizing CPU or marginal links. Apply the same control to the public-sector campus rollout checklist.

C:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A directly relevant preventive control is: Set realistic BFD detection timers and avoid destabilizing CPU or marginal links. Apply the same control to the public-sector campus rollout checklist.

D:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The repeat risk here is different: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. A directly relevant preventive control is: Set realistic BFD detection timers and avoid destabilizing CPU or marginal links. Apply the same control to the public-sector campus rollout checklist.

Question 265

A design team must resolve this enterprise network problem: Access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.
  2. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  3. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.
  4. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

Explanation

Correct Answer

C:

Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3. This action addresses the stated design problem. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A practical confirmation is: The port channel forms with valid peer identifiers and survives a single distribution-node failure.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The actual fault is governed by a different mechanism: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The needed response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

B:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The actual fault is governed by a different mechanism: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The needed response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The actual fault is governed by a different mechanism: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The needed response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

Question 266

The design record describes this issue: Access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. Which technical principle BEST explains the design decision?

  1. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.
  2. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.
  3. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  4. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.

Explanation

Correct Answer

D:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The correct engineering response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3. The observable check is: The port channel forms with valid peer identifiers and survives a single distribution-node failure.

Incorrect Answers

A:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. Those technical conditions are not interchangeable.

B:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. Those technical conditions are not interchangeable.

C:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. Those technical conditions are not interchangeable.

Question 267

After designing a change for the following scenario: Access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. Which acceptance observation BEST establishes the intended result?

  1. The port channel forms with valid peer identifiers and survives a single distribution-node failure.
  2. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.
  3. Data-plane traffic remains within loss targets during a controlled route-processor switchover.
  4. Client traffic continues through the surviving distribution device after the primary gateway is shut down.

Explanation

Correct Answer

A:

The port channel forms with valid peer identifiers and survives a single distribution-node failure. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.

Incorrect Answers

B:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The necessary acceptance evidence is: The port channel forms with valid peer identifiers and survives a single distribution-node failure.

C:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The necessary acceptance evidence is: The port channel forms with valid peer identifiers and survives a single distribution-node failure.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. In the case being tested, Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The necessary acceptance evidence is: The port channel forms with valid peer identifiers and survives a single distribution-node failure.

Question 268

A preventive architecture review covers this situation: Access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Validate timer, tracking, and gateway ownership changes in scheduled failover drills.
  2. Verify platform multichassis features and split-brain protections before cabling changes.
  3. Include upstream-path tracking and recovery hysteresis in gateway designs.
  4. Include wireless fabric role and mobility tests in the overall SDA design review.

Explanation

Correct Answer

B:

Verify platform multichassis features and split-brain protections before cabling changes. This control targets the underlying design risk. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The follow-up acceptance check remains: The port channel forms with valid peer identifiers and survives a single distribution-node failure.

Incorrect Answers

A:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The repeat risk here is different: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A directly relevant preventive control is: Verify platform multichassis features and split-brain protections before cabling changes.

C:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A directly relevant preventive control is: Verify platform multichassis features and split-brain protections before cabling changes.

D:

Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. The repeat risk here is different: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A directly relevant preventive control is: Verify platform multichassis features and split-brain protections before cabling changes.

Question 269

A new campus or WAN review presents this constraint: During a predeployment review for a large research campus, the team discovers this design gap: access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. 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 upstream interface or route tracking to reduce the gateway priority when critical reachability fails.
  2. Select a supported standards-based VRRP design compatible with the required participating platforms.
  3. Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.
  4. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

Explanation

Correct Answer

D:

Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3. This action addresses the stated design problem. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. A practical confirmation is: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

Incorrect Answers

A:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The actual fault is governed by a different mechanism: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The needed response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The actual fault is governed by a different mechanism: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The needed response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

C:

RSTP enables faster convergence than legacy 802.1D in supported topologies when port roles are correctly configured. The actual fault is governed by a different mechanism: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The needed response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

Question 270

For this Cisco ENSLD design case: During a predeployment review for a large research campus, the team discovers this design gap: access switches dual-home to separate distribution devices, but the proposed design creates two unrelated LACP peers. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.
  2. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.
  3. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.
  4. Route summarization reduces upstream route detail and contains changes within appropriate campus areas.

Explanation

Correct Answer

A:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The correct engineering response is: Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3. The observable check is: The port channel forms with valid peer identifiers and survives a single distribution-node failure. The large research campus acceptance record also captures this result.

Incorrect Answers

B:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. Those technical conditions are not interchangeable.

C:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. Those technical conditions are not interchangeable.

D:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The offered choice instead concerns a different principle: Route summarization reduces upstream route detail and contains changes within appropriate campus areas. Those technical conditions are not interchangeable.