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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 26

Question 250

The design record describes this issue: A Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. 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. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.
  3. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.
  4. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.

Explanation

Correct Answer

D:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The correct engineering response is: Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities. The observable check is: Data-plane traffic remains within loss targets during a controlled route-processor switchover.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. 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.

B:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. 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.

C:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. 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.

Question 251

After designing a change for the following scenario: A Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. Which acceptance observation BEST establishes the intended result?

  1. Data-plane traffic remains within loss targets during a controlled route-processor switchover.
  2. Client traffic continues through the surviving distribution device after the primary gateway is shut down.
  3. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Explanation

Correct Answer

A:

Data-plane traffic remains within loss targets during a controlled route-processor switchover. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.

Incorrect Answers

B:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. In the case being tested, Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The necessary acceptance evidence is: Data-plane traffic remains within loss targets during a controlled route-processor switchover.

C:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. In the case being tested, Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The necessary acceptance evidence is: Data-plane traffic remains within loss targets during a controlled route-processor switchover.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The necessary acceptance evidence is: Data-plane traffic remains within loss targets during a controlled route-processor switchover.

Question 252

A preventive architecture review covers this situation: A Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.
  2. Test control-plane redundancy and helper interactions during staged software upgrades.
  3. Verify platform multichassis features and split-brain protections before cabling changes.
  4. Validate timer, tracking, and gateway ownership changes in scheduled failover drills.

Explanation

Correct Answer

B:

Test control-plane redundancy and helper interactions during staged software upgrades. This control targets the underlying design risk. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The follow-up acceptance check remains: Data-plane traffic remains within loss targets during a controlled route-processor switchover.

Incorrect Answers

A:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The repeat risk here is different: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A directly relevant preventive control is: Test control-plane redundancy and helper interactions during staged software upgrades.

C:

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: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A directly relevant preventive control is: Test control-plane redundancy and helper interactions during staged software upgrades.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The repeat risk here is different: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A directly relevant preventive control is: Test control-plane redundancy and helper interactions during staged software upgrades.

Question 253

A new campus or WAN review presents this constraint: During a predeployment review for a new headquarters building, the team discovers this design gap: a Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  2. Select a supported standards-based VRRP design compatible with the required participating platforms.
  3. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.
  4. Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.

Explanation

Correct Answer

D:

Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities. This action addresses the stated design problem. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A practical confirmation is: Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building 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 actual fault is governed by a different mechanism: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The needed response is: Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The actual fault is governed by a different mechanism: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The needed response is: Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.

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: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The needed response is: Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.

Question 254

For this Cisco ENSLD design case: During a predeployment review for a new headquarters building, the team discovers this design gap: a Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. 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. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.

Explanation

Correct Answer

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The correct engineering response is: Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities. The observable check is: Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building acceptance record also captures this result.

Incorrect Answers

B:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. 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:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. 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:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. 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.

Question 255

During acceptance testing for this network design: During a predeployment review for a new headquarters building, the team discovers this design gap: a Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Participating platforms elect the expected master and hosts retain gateway reachability after master failure.
  2. Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building acceptance record also captures this result.
  3. Client traffic continues through the surviving distribution device after the primary gateway is shut down.
  4. The port channel forms with valid peer identifiers and survives a single distribution-node failure.

Explanation

Correct Answer

B:

Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building acceptance record also captures this result. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.

Incorrect Answers

A:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. In the case being tested, Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The necessary acceptance evidence is: Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building 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, Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The necessary acceptance evidence is: Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building acceptance record also captures this result.

D:

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, Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The necessary acceptance evidence is: Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building acceptance record also captures this result.

Question 256

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a new headquarters building, the team discovers this design gap: a Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. 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. Validate timer, tracking, and gateway ownership changes in scheduled failover drills.
  2. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.
  3. Test control-plane redundancy and helper interactions during staged software upgrades. Apply the same control to the new headquarters building rollout checklist.
  4. Include upstream-path tracking and recovery hysteresis in gateway designs.

Explanation

Correct Answer

C:

Test control-plane redundancy and helper interactions during staged software upgrades. Apply the same control to the new headquarters building rollout checklist. This control targets the underlying design risk. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The follow-up acceptance check remains: Data-plane traffic remains within loss targets during a controlled route-processor switchover. The new headquarters building acceptance record also captures this result.

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: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A directly relevant preventive control is: Test control-plane redundancy and helper interactions during staged software upgrades. Apply the same control to the new headquarters building rollout checklist.

B:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The repeat risk here is different: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A directly relevant preventive control is: Test control-plane redundancy and helper interactions during staged software upgrades. Apply the same control to the new headquarters building rollout checklist.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. A directly relevant preventive control is: Test control-plane redundancy and helper interactions during staged software upgrades. Apply the same control to the new headquarters building rollout checklist.

Question 257

A Cisco enterprise designer reviews the following scenario: BGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. Which action MOST DIRECTLY meets the stated design requirement?

  1. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  2. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.
  3. Select a supported standards-based VRRP design compatible with the required participating platforms.
  4. Use an appropriate rapid spanning-tree design with correct edge-port roles and designated forwarding paths.

Explanation

Correct Answer

A:

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.

Incorrect Answers

B:

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: 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:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. 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:

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: 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 258

The network architecture board discusses the following: BGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. Which technical principle BEST explains the design decision?

  1. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  2. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.
  3. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.
  4. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.

Explanation

Correct Answer

B:

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.

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. Those technical conditions are not interchangeable.

C:

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 259

The infrastructure team must validate this situation: BGP and OSPF adjacencies over a fast optical campus ring take seconds to fail over after a clean link failure. 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. Participating platforms elect the expected master and hosts retain gateway reachability after master failure.
  3. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.
  4. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

Explanation

Correct Answer

C:

Loss of a test link is reflected in BFD-down and a timely routing reconvergence event. 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.

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. 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.

D:

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.

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.