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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 6

Question 50

The network architecture board discusses the following: An IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. Which technical principle BEST explains the design decision?

  1. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information.
  2. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.
  3. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction.
  4. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists.

Explanation

Correct Answer

B:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The correct engineering response is: Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity. The observable check is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.

Incorrect Answers

A:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The offered choice instead concerns a different principle: Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. Those technical conditions are not interchangeable.

C:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The offered choice instead concerns a different principle: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. Those technical conditions are not interchangeable.

D:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The offered choice instead concerns a different principle: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. Those technical conditions are not interchangeable.

Question 51

The infrastructure team must validate this situation: An IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. Which acceptance observation BEST establishes the intended result?

  1. Other nodes stop using the device as transit while its required management or local reachability remains verified.
  2. Only expected authenticated IS-IS peers form adjacencies and unauthorized join attempts fail.
  3. Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.
  4. The computed best paths follow documented metrics and traffic returns across an available intended path.

Explanation

Correct Answer

C:

Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.

Incorrect Answers

A:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. In the case being tested, IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The necessary acceptance evidence is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.

B:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. In the case being tested, IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The necessary acceptance evidence is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.

D:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. In the case being tested, IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The necessary acceptance evidence is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.

Question 52

A post-incident design review discusses the following: An IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Standardize key rotation and restrict routing adjacency interfaces.
  2. Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.
  3. Version-control metric policy and inspect SPF changes during circuit upgrades.
  4. Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.

Explanation

Correct Answer

D:

Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition. This control targets the underlying design risk. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The follow-up acceptance check remains: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.

Incorrect Answers

A:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The repeat risk here is different: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A directly relevant preventive control is: Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.

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: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A directly relevant preventive control is: Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.

C:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The repeat risk here is different: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A directly relevant preventive control is: Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.

Question 53

During a network design workshop, the team finds this issue: During a predeployment review for a multisite healthcare network, the team discovers this design gap: an IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.
  2. Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity.
  3. Enable supported IS-IS adjacency authentication and restrict the physical or logical peer surface.
  4. Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it.

Explanation

Correct Answer

B:

Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity. This action addresses the stated design problem. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A practical confirmation is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result.

Incorrect Answers

A:

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: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The needed response is: Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity.

C:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The actual fault is governed by a different mechanism: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The needed response is: Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity.

D:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The actual fault is governed by a different mechanism: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The needed response is: Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity.

Question 54

In a technical design review: During a predeployment review for a multisite healthcare network, the team discovers this design gap: an IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction.
  2. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists.
  3. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.
  4. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules.

Explanation

Correct Answer

C:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The correct engineering response is: Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity. The observable check is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network 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 offered choice instead concerns a different principle: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. Those technical conditions are not interchangeable.

B:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The offered choice instead concerns a different principle: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. Those technical conditions are not interchangeable.

D:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The offered choice instead concerns a different principle: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. Those technical conditions are not interchangeable.

Question 55

An engineering reviewer needs objective proof for the following: During a predeployment review for a multisite healthcare network, the team discovers this design gap: an IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Other nodes stop using the device as transit while its required management or local reachability remains verified.
  2. The computed best paths follow documented metrics and traffic returns across an available intended path.
  3. Only expected authenticated IS-IS peers form adjacencies and unauthorized join attempts fail.
  4. Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result.

Explanation

Correct Answer

D:

Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.

Incorrect Answers

A:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. In the case being tested, IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The necessary acceptance evidence is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result.

B:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. In the case being tested, IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The necessary acceptance evidence is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result.

C:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. In the case being tested, IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The necessary acceptance evidence is: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result.

Question 56

The change advisory board sees a repeat risk in this case: During a predeployment review for a multisite healthcare network, the team discovers this design gap: an IS-IS campus has access routers that need only local area routes but their LSDBs grow with all enterprise topology changes. 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. Apply the same control to the multisite healthcare network rollout checklist.
  2. Standardize key rotation and restrict routing adjacency interfaces.
  3. Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.
  4. Version-control metric policy and inspect SPF changes during circuit upgrades.

Explanation

Correct Answer

A:

Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition. Apply the same control to the multisite healthcare network rollout checklist. This control targets the underlying design risk. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The follow-up acceptance check remains: Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary. The multisite healthcare network acceptance record also captures this result.

Incorrect Answers

B:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The repeat risk here is different: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A directly relevant preventive control is: Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition. Apply the same control to the multisite healthcare network rollout checklist.

C:

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: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A directly relevant preventive control is: Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition. Apply the same control to the multisite healthcare network 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: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. A directly relevant preventive control is: Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition. Apply the same control to the multisite healthcare network rollout checklist.

Question 57

A design team must resolve this enterprise network problem: A new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.
  2. Enable supported IS-IS adjacency authentication and restrict the physical or logical peer surface.
  3. Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.
  4. Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it.

Explanation

Correct Answer

C:

Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability. This action addresses the stated design problem. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. A practical confirmation is: The computed best paths follow documented metrics and traffic returns across an available intended path.

Incorrect Answers

A:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The actual fault is governed by a different mechanism: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The needed response is: Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.

B:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The actual fault is governed by a different mechanism: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The needed response is: Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.

D:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The actual fault is governed by a different mechanism: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The needed response is: Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.

Question 58

The design record describes this issue: A new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. Which technical principle BEST explains the design decision?

  1. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.
  2. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information.
  3. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules.
  4. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction.

Explanation

Correct Answer

D:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The correct engineering response is: Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability. The observable check is: The computed best paths follow documented metrics and traffic returns across an available intended path.

Incorrect Answers

A:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The offered choice instead concerns a different principle: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. Those technical conditions are not interchangeable.

B:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The offered choice instead concerns a different principle: Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. Those technical conditions are not interchangeable.

C:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The offered choice instead concerns a different principle: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. Those technical conditions are not interchangeable.

Question 59

After designing a change for the following scenario: A new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. Which acceptance observation BEST establishes the intended result?

  1. The computed best paths follow documented metrics and traffic returns across an available intended path.
  2. Other nodes stop using the device as transit while its required management or local reachability remains verified.
  3. Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.
  4. Both intended qualifying paths are installed and observed utilization remains inside the design constraints.

Explanation

Correct Answer

A:

The computed best paths follow documented metrics and traffic returns across an available intended path. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction.

Incorrect Answers

B:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. In the case being tested, IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The necessary acceptance evidence is: The computed best paths follow documented metrics and traffic returns across an available intended path.

C:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. In the case being tested, IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The necessary acceptance evidence is: The computed best paths follow documented metrics and traffic returns across an available intended path.

D:

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, IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The necessary acceptance evidence is: The computed best paths follow documented metrics and traffic returns across an available intended path.

Question 60

A preventive architecture review covers this situation: A new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Standardize key rotation and restrict routing adjacency interfaces.
  2. Version-control metric policy and inspect SPF changes during circuit upgrades.
  3. Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.
  4. Re-evaluate feasible paths whenever interface bandwidth or delay policy changes.

Explanation

Correct Answer

B:

Version-control metric policy and inspect SPF changes during circuit upgrades. This control targets the underlying design risk. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The follow-up acceptance check remains: The computed best paths follow documented metrics and traffic returns across an available intended path.

Incorrect Answers

A:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The repeat risk here is different: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. A directly relevant preventive control is: Version-control metric policy and inspect SPF changes during circuit upgrades.

C:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The repeat risk here is different: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. A directly relevant preventive control is: Version-control metric policy and inspect SPF changes during circuit upgrades.

D:

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: IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. A directly relevant preventive control is: Version-control metric policy and inspect SPF changes during circuit upgrades.