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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 10

Question 90

The design record describes this issue: A WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. Which technical principle BEST explains the design decision?

  1. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes.
  2. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks.
  3. A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange.
  4. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup.

Explanation

Correct Answer

D:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The correct engineering response is: Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors. The observable check is: The topology table identifies feasible successors where available and failover measurements match expectations.

Incorrect Answers

A:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The offered choice instead concerns a different principle: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. Those technical conditions are not interchangeable.

B:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The offered choice instead concerns a different principle: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. Those technical conditions are not interchangeable.

C:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The offered choice instead concerns a different principle: a mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. Those technical conditions are not interchangeable.

Question 91

After designing a change for the following scenario: A WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. Which acceptance observation BEST establishes the intended result?

  1. The topology table identifies feasible successors where available and failover measurements match expectations.
  2. Both intended qualifying paths are installed and observed utilization remains inside the design constraints.
  3. Peer adjacencies establish and routes enter the topology table after the K-values match.
  4. Traffic to each intended component prefix succeeds and unused portions of the summary are not inadvertently advertised.

Explanation

Correct Answer

A:

The topology table identifies feasible successors where available and failover measurements match expectations. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup.

Incorrect Answers

B:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. In the case being tested, a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The necessary acceptance evidence is: The topology table identifies feasible successors where available and failover measurements match expectations.

C:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. In the case being tested, a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The necessary acceptance evidence is: The topology table identifies feasible successors where available and failover measurements match expectations.

D:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. In the case being tested, a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The necessary acceptance evidence is: The topology table identifies feasible successors where available and failover measurements match expectations.

Question 92

A preventive architecture review covers this situation: A WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.
  2. Validate EIGRP successor and backup behavior during link-failure testing.
  3. Enforce a single approved EIGRP metric profile via configuration validation.
  4. Make EIGRP stub status part of remote-site configuration templates.

Explanation

Correct Answer

B:

Validate EIGRP successor and backup behavior during link-failure testing. This control targets the underlying design risk. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The follow-up acceptance check remains: The topology table identifies feasible successors where available and failover measurements match expectations.

Incorrect Answers

A:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The repeat risk here is different: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A directly relevant preventive control is: Validate EIGRP successor and backup behavior during link-failure testing.

C:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The repeat risk here is different: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A directly relevant preventive control is: Validate EIGRP successor and backup behavior during link-failure testing.

D:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The repeat risk here is different: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A directly relevant preventive control is: Validate EIGRP successor and backup behavior during link-failure testing.

Question 93

A new campus or WAN review presents this constraint: During a predeployment review for a financial services campus, the team discovers this design gap: a WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.
  2. Narrow the summary or correct allocation so the aggregate represents reachable subordinate networks.
  3. Make EIGRP metric K-values consistent across peers that must form an adjacency.
  4. Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.

Explanation

Correct Answer

D:

Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors. This action addresses the stated design problem. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A practical confirmation is: The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.

Incorrect Answers

A:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The actual fault is governed by a different mechanism: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The needed response is: Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.

B:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The actual fault is governed by a different mechanism: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The needed response is: Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.

C:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The actual fault is governed by a different mechanism: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The needed response is: Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.

Question 94

For this Cisco ENSLD design case: During a predeployment review for a financial services campus, the team discovers this design gap: a WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup.
  2. A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange.
  3. EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations.
  4. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks.

Explanation

Correct Answer

A:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The correct engineering response is: Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors. The observable check is: The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.

Incorrect Answers

B:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The offered choice instead concerns a different principle: a mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. Those technical conditions are not interchangeable.

C:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The offered choice instead concerns a different principle: EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. Those technical conditions are not interchangeable.

D:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The offered choice instead concerns a different principle: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. Those technical conditions are not interchangeable.

Question 95

During acceptance testing for this network design: During a predeployment review for a financial services campus, the team discovers this design gap: a WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Both intended qualifying paths are installed and observed utilization remains inside the design constraints.
  2. The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.
  3. Peer adjacencies establish and routes enter the topology table after the K-values match.
  4. Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

Explanation

Correct Answer

B:

The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup.

Incorrect Answers

A:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. In the case being tested, a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The necessary acceptance evidence is: The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.

C:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. In the case being tested, a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The necessary acceptance evidence is: The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.

D:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. In the case being tested, a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The necessary acceptance evidence is: The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.

Question 96

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a financial services campus, the team discovers this design gap: a WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. 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. Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.
  2. Make EIGRP stub status part of remote-site configuration templates.
  3. Validate EIGRP successor and backup behavior during link-failure testing. Apply the same control to the financial services campus rollout checklist.
  4. Check summary coverage against the live IPAM and planned branch growth.

Explanation

Correct Answer

C:

Validate EIGRP successor and backup behavior during link-failure testing. Apply the same control to the financial services campus rollout checklist. This control targets the underlying design risk. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The follow-up acceptance check remains: The topology table identifies feasible successors where available and failover measurements match expectations. The financial services campus acceptance record also captures this result.

Incorrect Answers

A:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The repeat risk here is different: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A directly relevant preventive control is: Validate EIGRP successor and backup behavior during link-failure testing. Apply the same control to the financial services campus rollout checklist.

B:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The repeat risk here is different: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A directly relevant preventive control is: Validate EIGRP successor and backup behavior during link-failure testing. Apply the same control to the financial services campus rollout checklist.

D:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The repeat risk here is different: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. A directly relevant preventive control is: Validate EIGRP successor and backup behavior during link-failure testing. Apply the same control to the financial services campus rollout checklist.

Question 97

A Cisco enterprise designer reviews the following scenario: Two EIGRP links have unequal metrics and the business wants controlled use of both only where loop-free feasibility permits it. Which action MOST DIRECTLY meets the stated design requirement?

  1. Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.
  2. Make EIGRP metric K-values consistent across peers that must form an adjacency.
  3. Configure remote EIGRP spokes as stubs with appropriate advertised route types.
  4. Ensure next-hop reachability through the IGP or apply next-hop-self at an appropriate border as designed.

Explanation

Correct Answer

A:

Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate. This action addresses the stated design problem. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. A practical confirmation is: Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

Incorrect Answers

B:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The actual fault is governed by a different mechanism: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The needed response is: Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.

C:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The actual fault is governed by a different mechanism: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The needed response is: Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.

D:

BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. The actual fault is governed by a different mechanism: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The needed response is: Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.

Question 98

The network architecture board discusses the following: Two EIGRP links have unequal metrics and the business wants controlled use of both only where loop-free feasibility permits it. Which technical principle BEST explains the design decision?

  1. A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange.
  2. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks.
  3. EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations.
  4. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.

Explanation

Correct Answer

B:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The correct engineering response is: Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate. The observable check is: Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

Incorrect Answers

A:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The offered choice instead concerns a different principle: a mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. Those technical conditions are not interchangeable.

C:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The offered choice instead concerns a different principle: EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. Those technical conditions are not interchangeable.

D:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The offered choice instead concerns a different principle: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. Those technical conditions are not interchangeable.

Question 99

The infrastructure team must validate this situation: Two EIGRP links have unequal metrics and the business wants controlled use of both only where loop-free feasibility permits it. Which acceptance observation BEST establishes the intended result?

  1. Traffic to each intended component prefix succeeds and unused portions of the summary are not inadvertently advertised.
  2. Peer adjacencies establish and routes enter the topology table after the K-values match.
  3. Both intended qualifying paths are installed and observed utilization remains inside the design constraints.
  4. Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

Explanation

Correct Answer

C:

Both intended qualifying paths are installed and observed utilization remains inside the design constraints. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks.

Incorrect Answers

A:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. In the case being tested, EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The necessary acceptance evidence is: Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

B:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. In the case being tested, EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The necessary acceptance evidence is: Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

D:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. In the case being tested, EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The necessary acceptance evidence is: Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

Question 100

A post-incident design review discusses the following: Two EIGRP links have unequal metrics and the business wants controlled use of both only where loop-free feasibility permits it. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Make EIGRP stub status part of remote-site configuration templates.
  2. Check summary coverage against the live IPAM and planned branch growth.
  3. Enforce a single approved EIGRP metric profile via configuration validation.
  4. Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.

Explanation

Correct Answer

D:

Re-evaluate feasible paths whenever interface bandwidth or delay policy changes. This control targets the underlying design risk. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The follow-up acceptance check remains: Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

Incorrect Answers

A:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The repeat risk here is different: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. A directly relevant preventive control is: Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.

B:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The repeat risk here is different: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. A directly relevant preventive control is: Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.

C:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The repeat risk here is different: EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. A directly relevant preventive control is: Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.