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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 9

Question 80

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a logistics division, the team discovers this design gap: an IS-IS link is connected to a neighboring organization and unauthorized routers could establish routing adjacencies. 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. Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.
  2. Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.
  3. Standardize key rotation and restrict routing adjacency interfaces. Apply the same control to the logistics division rollout checklist.
  4. Version-control metric policy and inspect SPF changes during circuit upgrades.

Explanation

Correct Answer

C:

Standardize key rotation and restrict routing adjacency interfaces. Apply the same control to the logistics division rollout checklist. This control targets the underlying design risk. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The follow-up acceptance check remains: Only expected authenticated IS-IS peers form adjacencies and unauthorized join attempts fail. The logistics division acceptance record also captures this result.

Incorrect Answers

A:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The repeat risk here is different: Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. A directly relevant preventive control is: Standardize key rotation and restrict routing adjacency interfaces. Apply the same control to the logistics division rollout checklist.

B:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The repeat risk here is different: Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. A directly relevant preventive control is: Standardize key rotation and restrict routing adjacency interfaces. Apply the same control to the logistics division rollout checklist.

D:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The repeat risk here is different: Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. A directly relevant preventive control is: Standardize key rotation and restrict routing adjacency interfaces. Apply the same control to the logistics division rollout checklist.

Question 81

A Cisco enterprise designer reviews the following scenario: A hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. Which action MOST DIRECTLY meets the stated design requirement?

  1. Configure remote EIGRP spokes as stubs with appropriate advertised route types.
  2. Make EIGRP metric K-values consistent across peers that must form an adjacency.
  3. Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.
  4. Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.

Explanation

Correct Answer

A:

Configure remote EIGRP spokes as stubs with appropriate advertised route types. This action addresses the stated design problem. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A practical confirmation is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

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 stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The needed response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types.

C:

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: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The needed response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types.

D:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The actual fault is governed by a different mechanism: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The needed response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types.

Question 82

The network architecture board discusses the following: A hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. Which technical principle BEST explains the design decision?

  1. A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange.
  2. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes.
  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

B:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The correct engineering response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types. The observable check is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

Incorrect Answers

A:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. 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 stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. 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 stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. 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 83

The infrastructure team must validate this situation: A hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. Which acceptance observation BEST establishes the intended result?

  1. The topology table identifies feasible successors where available and failover measurements match expectations.
  2. Traffic to each intended component prefix succeeds and unused portions of the summary are not inadvertently advertised.
  3. Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.
  4. Peer adjacencies establish and routes enter the topology table after the K-values match.

Explanation

Correct Answer

C:

Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes.

Incorrect Answers

A:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. In the case being tested, EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The necessary acceptance evidence is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

B:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. In the case being tested, EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The necessary acceptance evidence is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

D:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. In the case being tested, EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The necessary acceptance evidence is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

Question 84

A post-incident design review discusses the following: A hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Validate EIGRP successor and backup behavior during link-failure testing.
  2. Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.
  3. Check summary coverage against the live IPAM and planned branch growth.
  4. Make EIGRP stub status part of remote-site configuration templates.

Explanation

Correct Answer

D:

Make EIGRP stub status part of remote-site configuration templates. This control targets the underlying design risk. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The follow-up acceptance check remains: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact.

Incorrect Answers

A:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The repeat risk here is different: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A directly relevant preventive control is: Make EIGRP stub status part of remote-site configuration templates.

B:

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: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A directly relevant preventive control is: Make EIGRP stub status part of remote-site configuration templates.

C:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The repeat risk here is different: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A directly relevant preventive control is: Make EIGRP stub status part of remote-site configuration templates.

Question 85

During a network design workshop, the team finds this issue: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: a hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.
  2. Configure remote EIGRP spokes as stubs with appropriate advertised route types.
  3. Narrow the summary or correct allocation so the aggregate represents reachable subordinate networks.
  4. Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.

Explanation

Correct Answer

B:

Configure remote EIGRP spokes as stubs with appropriate advertised route types. This action addresses the stated design problem. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A practical confirmation is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

Incorrect Answers

A:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The actual fault is governed by a different mechanism: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The needed response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types.

C:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The actual fault is governed by a different mechanism: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The needed response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types.

D:

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: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The needed response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types.

Question 86

In a technical design review: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: a hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks.
  2. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup.
  3. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes.
  4. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.

Explanation

Correct Answer

C:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The correct engineering response is: Configure remote EIGRP spokes as stubs with appropriate advertised route types. The observable check is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

Incorrect Answers

A:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. 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.

B:

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

D:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The offered choice instead concerns a different principle: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. Those technical conditions are not interchangeable.

Question 87

An engineering reviewer needs objective proof for the following: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: a hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Traffic to each intended component prefix succeeds and unused portions of the summary are not inadvertently advertised.
  4. Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

Explanation

Correct Answer

D:

Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes.

Incorrect Answers

A:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. In the case being tested, EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The necessary acceptance evidence is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

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, EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The necessary acceptance evidence is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

C:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. In the case being tested, EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The necessary acceptance evidence is: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

Question 88

The change advisory board sees a repeat risk in this case: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: a hub-and-spoke EIGRP network has small remote sites that must never become transit for routes learned elsewhere. 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. Make EIGRP stub status part of remote-site configuration templates. Apply the same control to the manufacturing regional hub rollout checklist.
  2. Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.
  3. Check summary coverage against the live IPAM and planned branch growth.
  4. Enforce a single approved EIGRP metric profile via configuration validation.

Explanation

Correct Answer

A:

Make EIGRP stub status part of remote-site configuration templates. Apply the same control to the manufacturing regional hub rollout checklist. This control targets the underlying design risk. EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The follow-up acceptance check remains: Hub route queries do not unnecessarily propagate through the spoke and local reachability remains intact. The manufacturing regional hub acceptance record also captures this result.

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. The repeat risk here is different: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A directly relevant preventive control is: Make EIGRP stub status part of remote-site configuration templates. Apply the same control to the manufacturing regional hub rollout checklist.

C:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The repeat risk here is different: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A directly relevant preventive control is: Make EIGRP stub status part of remote-site configuration templates. Apply the same control to the manufacturing regional hub rollout checklist.

D:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The repeat risk here is different: EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. A directly relevant preventive control is: Make EIGRP stub status part of remote-site configuration templates. Apply the same control to the manufacturing regional hub rollout checklist.

Question 89

A design team must resolve this enterprise network problem: A WAN team expects every EIGRP backup next hop to be instantly installable despite a neighbor not meeting the feasibility condition. Which action MOST DIRECTLY meets the stated design requirement?

  1. Configure remote EIGRP spokes as stubs with appropriate advertised route types.
  2. Make EIGRP metric K-values consistent across peers that must form an adjacency.
  3. Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.
  4. Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.

Explanation

Correct Answer

C:

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.

Incorrect Answers

A:

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: 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:

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.

D:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. 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 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.