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

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Cisco 300-420 Practice Test 24

Question 230

In a technical design review: During a predeployment review for a regional distribution facility, the team discovers this design gap: a distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  2. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.
  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

C:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The correct engineering response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover. The observable check is: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility 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 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.

B:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. 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.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. 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 231

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 distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

D:

Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility acceptance record also captures this result. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.

Incorrect Answers

A:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The necessary acceptance evidence is: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility acceptance record also captures this result.

B:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The necessary acceptance evidence is: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility acceptance record also captures this result.

C:

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, an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The necessary acceptance evidence is: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility acceptance record also captures this result.

Question 232

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 distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. 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. Apply the same control to the regional distribution facility rollout checklist.
  2. Test control-plane redundancy and helper interactions during staged software upgrades.
  3. Verify actual platform and software interoperability before relying on multivendor FHRP.
  4. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.

Explanation

Correct Answer

A:

Validate timer, tracking, and gateway ownership changes in scheduled failover drills. Apply the same control to the regional distribution facility rollout checklist. This control targets the underlying design risk. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The follow-up acceptance check remains: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility 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 repeat risk here is different: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A directly relevant preventive control is: Validate timer, tracking, and gateway ownership changes in scheduled failover drills. Apply the same control to the regional distribution facility rollout checklist.

C:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The repeat risk here is different: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A directly relevant preventive control is: Validate timer, tracking, and gateway ownership changes in scheduled failover drills. Apply the same control to the regional distribution facility rollout checklist.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The repeat risk here is different: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A directly relevant preventive control is: Validate timer, tracking, and gateway ownership changes in scheduled failover drills. Apply the same control to the regional distribution facility rollout checklist.

Question 233

A design team must resolve this enterprise network problem: A redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. Which action MOST DIRECTLY meets the stated design requirement?

  1. Select a supported standards-based VRRP design compatible with the required participating platforms.
  2. Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.
  3. Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.
  4. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

Explanation

Correct Answer

C:

Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails. This action addresses the stated design problem. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A practical confirmation is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

Incorrect Answers

A:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The actual fault is governed by a different mechanism: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The needed response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

B:

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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The needed response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The needed response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

Question 234

The design record describes this issue: A redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. Which technical principle BEST explains the design decision?

  1. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.
  2. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  3. Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN.
  4. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.

Explanation

Correct Answer

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The correct engineering response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails. The observable check is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

Incorrect Answers

A:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. 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.

B:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. 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:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The offered choice instead concerns a different principle: Fabric-enabled wireless introduces control and forwarding integration choices different from a fully traditional overlay-free WLAN. Those technical conditions are not interchangeable.

Question 235

After designing a change for the following scenario: A redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. Which acceptance observation BEST establishes the intended result?

  1. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.
  2. The port channel forms with valid peer identifiers and survives a single distribution-node failure.
  3. Data-plane traffic remains within loss targets during a controlled route-processor switchover.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Explanation

Correct Answer

A:

After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.

Incorrect Answers

B:

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, FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The necessary acceptance evidence is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

C:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The necessary acceptance evidence is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The necessary acceptance evidence is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

Question 236

A preventive architecture review covers this situation: A redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.
  2. Include upstream-path tracking and recovery hysteresis in gateway designs.
  3. Verify actual platform and software interoperability before relying on multivendor FHRP.
  4. Validate timer, tracking, and gateway ownership changes in scheduled failover drills.

Explanation

Correct Answer

B:

Include upstream-path tracking and recovery hysteresis in gateway designs. This control targets the underlying design risk. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The follow-up acceptance check remains: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A directly relevant preventive control is: Include upstream-path tracking and recovery hysteresis in gateway designs.

C:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The repeat risk here is different: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A directly relevant preventive control is: Include upstream-path tracking and recovery hysteresis in gateway designs.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The repeat risk here is different: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A directly relevant preventive control is: Include upstream-path tracking and recovery hysteresis in gateway designs.

Question 237

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 redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Select a supported standards-based VRRP design compatible with the required participating platforms.
  2. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.
  3. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  4. Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

Explanation

Correct Answer

D:

Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails. This action addresses the stated design problem. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A practical confirmation is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.

Incorrect Answers

A:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The actual fault is governed by a different mechanism: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The needed response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The needed response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

C:

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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The needed response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

Question 238

For this Cisco ENSLD design case: During a predeployment review for a medical center network, the team discovers this design gap: a redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. 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. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.
  3. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.
  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:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The correct engineering response is: Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails. The observable check is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.

Incorrect Answers

B:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. 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.

C:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. 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.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. 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 239

During acceptance testing for this network design: During a predeployment review for a medical center network, the team discovers this design gap: a redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Client traffic continues through the surviving distribution device after the primary gateway is shut down.
  2. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.
  3. Participating platforms elect the expected master and hosts retain gateway reachability after master failure.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Explanation

Correct Answer

B:

After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.

Incorrect Answers

A:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. In the case being tested, FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The necessary acceptance evidence is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.

C:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. In the case being tested, FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The necessary acceptance evidence is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The necessary acceptance evidence is: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.

Question 240

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 redundant first-hop gateway keeps winning the active role despite losing its routed upstream connectivity. 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. Verify platform multichassis features and split-brain protections before cabling changes.
  2. Verify actual platform and software interoperability before relying on multivendor FHRP.
  3. Include upstream-path tracking and recovery hysteresis in gateway designs. Apply the same control to the medical center network rollout checklist.
  4. Test control-plane redundancy and helper interactions during staged software upgrades.

Explanation

Correct Answer

C:

Include upstream-path tracking and recovery hysteresis in gateway designs. Apply the same control to the medical center network rollout checklist. This control targets the underlying design risk. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The follow-up acceptance check remains: After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds. The medical center network acceptance record also captures this result.

Incorrect Answers

A:

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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A directly relevant preventive control is: Include upstream-path tracking and recovery hysteresis in gateway designs. Apply the same control to the medical center network rollout checklist.

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The repeat risk here is different: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A directly relevant preventive control is: Include upstream-path tracking and recovery hysteresis in gateway designs. Apply the same control to the medical center network 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: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. A directly relevant preventive control is: Include upstream-path tracking and recovery hysteresis in gateway designs. Apply the same control to the medical center network rollout checklist.