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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 25

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.

Question 241

A Cisco enterprise designer reviews the following scenario: A campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. 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 upstream interface or route tracking to reduce the gateway priority when critical reachability fails.
  3. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  4. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

Explanation

Correct Answer

A:

Select a supported standards-based VRRP design compatible with the required participating platforms. This action addresses the stated design problem. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A practical confirmation is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure.

Incorrect Answers

B:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The actual fault is governed by a different mechanism: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The needed response is: Select a supported standards-based VRRP design compatible with the required participating platforms.

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The needed response is: Select a supported standards-based VRRP design compatible with the required participating platforms.

D:

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The needed response is: Select a supported standards-based VRRP design compatible with the required participating platforms.

Question 242

The network architecture board discusses the following: A campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. 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. 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

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The correct engineering response is: Select a supported standards-based VRRP design compatible with the required participating platforms. The observable check is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure.

Incorrect Answers

A:

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

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

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

Question 243

The infrastructure team must validate this situation: A campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. 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. Client traffic continues through the surviving distribution device after the primary gateway is shut down.
  3. Participating platforms elect the expected master and hosts retain gateway reachability after master failure.
  4. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.

Explanation

Correct Answer

C:

Participating platforms elect the expected master and hosts retain gateway reachability after master failure. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.

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, VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The necessary acceptance evidence is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure.

B:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. In the case being tested, VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The necessary acceptance evidence is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. In the case being tested, VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The necessary acceptance evidence is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure.

Question 244

A post-incident design review discusses the following: A campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Set realistic BFD detection timers and avoid destabilizing CPU or marginal links.
  2. Verify platform multichassis features and split-brain protections before cabling changes.
  3. Validate timer, tracking, and gateway ownership changes in scheduled failover drills.
  4. Verify actual platform and software interoperability before relying on multivendor FHRP.

Explanation

Correct Answer

D:

Verify actual platform and software interoperability before relying on multivendor FHRP. This control targets the underlying design risk. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The follow-up acceptance check remains: Participating platforms elect the expected master and hosts retain gateway reachability after master failure.

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A directly relevant preventive control is: Verify actual platform and software interoperability before relying on multivendor FHRP.

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A directly relevant preventive control is: Verify actual platform and software interoperability before relying on multivendor FHRP.

C:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The repeat risk here is different: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A directly relevant preventive control is: Verify actual platform and software interoperability before relying on multivendor FHRP.

Question 245

During a network design workshop, the team finds this issue: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.
  2. Select a supported standards-based VRRP design compatible with the required participating platforms.
  3. Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.
  4. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.

Explanation

Correct Answer

B:

Select a supported standards-based VRRP design compatible with the required participating platforms. This action addresses the stated design problem. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A practical confirmation is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus 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 actual fault is governed by a different mechanism: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The needed response is: Select a supported standards-based VRRP design compatible with the required participating platforms.

C:

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The needed response is: Select a supported standards-based VRRP design compatible with the required participating platforms.

D:

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The needed response is: Select a supported standards-based VRRP design compatible with the required participating platforms.

Question 246

In a technical design review: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. 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. Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support.
  3. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  4. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.

Explanation

Correct Answer

C:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The correct engineering response is: Select a supported standards-based VRRP design compatible with the required participating platforms. The observable check is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus acceptance record also captures this result.

Incorrect Answers

A:

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

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

D:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. 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 247

An engineering reviewer needs objective proof for the following: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Data-plane traffic remains within loss targets during a controlled route-processor switchover.
  2. After loss of the tracked upstream path, the healthy gateway takes active forwarding and client traffic succeeds.
  3. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.
  4. Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus acceptance record also captures this result.

Explanation

Correct Answer

D:

Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus acceptance record also captures this result. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The necessary acceptance evidence is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial 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, VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The necessary acceptance evidence is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus acceptance record also captures this result.

C:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The necessary acceptance evidence is: Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus acceptance record also captures this result.

Question 248

The change advisory board sees a repeat risk in this case: During a predeployment review for a mixed-use industrial campus, the team discovers this design gap: a campus needs a vendor-independent first-hop gateway protocol rather than a Cisco-specific HSRP design. 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 actual platform and software interoperability before relying on multivendor FHRP. Apply the same control to the mixed-use industrial campus rollout checklist.
  2. Include upstream-path tracking and recovery hysteresis in gateway designs.
  3. Verify platform multichassis features and split-brain protections before cabling changes.
  4. Test control-plane redundancy and helper interactions during staged software upgrades.

Explanation

Correct Answer

A:

Verify actual platform and software interoperability before relying on multivendor FHRP. Apply the same control to the mixed-use industrial campus rollout checklist. This control targets the underlying design risk. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The follow-up acceptance check remains: Participating platforms elect the expected master and hosts retain gateway reachability after master failure. The mixed-use industrial campus 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 repeat risk here is different: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A directly relevant preventive control is: Verify actual platform and software interoperability before relying on multivendor FHRP. Apply the same control to the mixed-use industrial campus rollout checklist.

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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A directly relevant preventive control is: Verify actual platform and software interoperability before relying on multivendor FHRP. Apply the same control to the mixed-use industrial 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: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. A directly relevant preventive control is: Verify actual platform and software interoperability before relying on multivendor FHRP. Apply the same control to the mixed-use industrial campus rollout checklist.

Question 249

A design team must resolve this enterprise network problem: A Layer 3 gateway design promises packet forwarding continuity through a route-processor restart on hardware that supports nonstop forwarding. 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 upstream interface or route tracking to reduce the gateway priority when critical reachability fails.
  3. Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.
  4. Evaluate a VLAN access map for the specific Layer 2 filtering requirement with platform support.

Explanation

Correct Answer

C:

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.

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: 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:

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

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: 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 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.