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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 7

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.

Question 61

A new campus or WAN review presents this constraint: During a predeployment review for a distributed retail network, the team discovers this design gap: a new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Enable supported IS-IS adjacency authentication and restrict the physical or logical peer surface.
  2. Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.
  3. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.
  4. Use deliberate IS-IS metrics aligned to both directions of the design and verify bidirectional reachability.

Explanation

Correct Answer

D:

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. The distributed retail network acceptance record also captures this result.

Incorrect Answers

A:

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.

B:

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.

C:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. 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 62

For this Cisco ENSLD design case: During a predeployment review for a distributed retail network, the team discovers this design gap: a new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. 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. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.
  3. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists.
  4. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.

Explanation

Correct Answer

A:

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. The distributed retail network acceptance record also captures this result.

Incorrect Answers

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: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. 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: 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 shortest-path selection is based on configured link-state costs, which may differ by direction. 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 63

During acceptance testing for this network design: During a predeployment review for a distributed retail network, the team discovers this design gap: a new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. 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. The distributed retail network acceptance record also captures this result.
  3. Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.
  4. Only expected authenticated IS-IS peers form adjacencies and unauthorized join attempts fail.

Explanation

Correct Answer

B:

The computed best paths follow documented metrics and traffic returns across an available intended path. The distributed retail network acceptance record also captures this result. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction.

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 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. The distributed retail network acceptance record also captures this result.

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. The distributed retail network acceptance record also captures this result.

D:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. 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. The distributed retail network acceptance record also captures this result.

Question 64

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a distributed retail network, the team discovers this design gap: a new IS-IS backbone connection has large unidirectional metric asymmetry, producing unexpected return paths. 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. Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.
  2. Standardize key rotation and restrict routing adjacency interfaces.
  3. Version-control metric policy and inspect SPF changes during circuit upgrades. Apply the same control to the distributed retail network rollout checklist.
  4. Define stable IS-IS area boundaries and test failure behavior at each L1/L2 transition.

Explanation

Correct Answer

C:

Version-control metric policy and inspect SPF changes during circuit upgrades. Apply the same control to the distributed retail network rollout checklist. 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. The distributed retail network acceptance record also captures this result.

Incorrect Answers

A:

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 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. Apply the same control to the distributed retail network rollout checklist.

B:

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. Apply the same control to the distributed retail network rollout checklist.

D:

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. Apply the same control to the distributed retail network rollout checklist.

Question 65

A Cisco enterprise designer reviews the following scenario: A router being drained for maintenance continues drawing transit traffic through its IS-IS adjacency. 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. 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. Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements.

Explanation

Correct Answer

A:

Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service. This action addresses the stated design problem. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. A practical confirmation is: Other nodes stop using the device as transit while its required management or local reachability remains verified.

Incorrect Answers

B:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The actual fault is governed by a different mechanism: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The needed response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.

C:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The actual fault is governed by a different mechanism: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The needed response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.

D:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The actual fault is governed by a different mechanism: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The needed response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.

Question 66

The network architecture board discusses the following: A router being drained for maintenance continues drawing transit traffic through its IS-IS adjacency. 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. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists.
  3. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information.
  4. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.

Explanation

Correct Answer

B:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The correct engineering response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service. The observable check is: Other nodes stop using the device as transit while its required management or local reachability remains verified.

Incorrect Answers

A:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. 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.

C:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. 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.

D:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The offered choice instead concerns a different principle: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. Those technical conditions are not interchangeable.

Question 67

The infrastructure team must validate this situation: A router being drained for maintenance continues drawing transit traffic through its IS-IS adjacency. Which acceptance observation BEST establishes the intended result?

  1. Only expected authenticated IS-IS peers form adjacencies and unauthorized join attempts fail.
  2. Access routers retain area-local link-state information and still reach remote areas via the L1/L2 boundary.
  3. Other nodes stop using the device as transit while its required management or local reachability remains verified.
  4. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.

Explanation

Correct Answer

C:

Other nodes stop using the device as transit while its required management or local reachability remains verified. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists.

Incorrect Answers

A:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. In the case being tested, the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The necessary acceptance evidence is: Other nodes stop using the device as transit while its required management or local reachability remains verified.

B:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. In the case being tested, the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The necessary acceptance evidence is: Other nodes stop using the device as transit while its required management or local reachability remains verified.

D:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. In the case being tested, the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The necessary acceptance evidence is: Other nodes stop using the device as transit while its required management or local reachability remains verified.

Question 68

A post-incident design review discusses the following: A router being drained for maintenance continues drawing transit traffic through its IS-IS adjacency. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Version-control metric policy and inspect SPF changes during circuit upgrades.
  2. Standardize key rotation and restrict routing adjacency interfaces.
  3. Validate multipath equivalence and hashing behavior during capacity tests.
  4. Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.

Explanation

Correct Answer

D:

Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks. This control targets the underlying design risk. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The follow-up acceptance check remains: Other nodes stop using the device as transit while its required management or local reachability remains verified.

Incorrect Answers

A:

IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction. The repeat risk here is different: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. A directly relevant preventive control is: Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.

B:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The repeat risk here is different: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. A directly relevant preventive control is: Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.

C:

BGP multipath requires compatible selected paths under the platform’s path-equivalence rules; mere coexistence of peers is not enough. The repeat risk here is different: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. A directly relevant preventive control is: Adopt a controlled IS-IS maintenance runbook with pre-drain and restoration checks.

Question 69

During a network design workshop, the team finds this issue: During a predeployment review for a university backbone, the team discovers this design gap: a router being drained for maintenance continues drawing transit traffic through its IS-IS adjacency. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Enable supported IS-IS adjacency authentication and restrict the physical or logical peer surface.
  2. Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.
  3. Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity.
  4. Use a properly designed not-so-stubby area and validate Type 7 translation at its ABR.

Explanation

Correct Answer

B:

Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service. This action addresses the stated design problem. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. A practical confirmation is: Other nodes stop using the device as transit while its required management or local reachability remains verified. The university backbone acceptance record also captures this result.

Incorrect Answers

A:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The actual fault is governed by a different mechanism: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The needed response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.

C:

IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. The actual fault is governed by a different mechanism: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The needed response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.

D:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The actual fault is governed by a different mechanism: the IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The needed response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service.

Question 70

In a technical design review: During a predeployment review for a university backbone, the team discovers this design gap: a router being drained for maintenance continues drawing transit traffic through its IS-IS adjacency. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information.
  2. IS-IS shortest-path selection is based on configured link-state costs, which may differ by direction.
  3. The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists.
  4. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.

Explanation

Correct Answer

C:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The correct engineering response is: Use an appropriate IS-IS overload-bit maintenance procedure before removing the router from transit service. The observable check is: Other nodes stop using the device as transit while its required management or local reachability remains verified. The university backbone acceptance record also captures this result.

Incorrect Answers

A:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. 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.

B:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. 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:

The IS-IS overload bit discourages other routers from selecting the device as intermediate transit when a valid alternative exists. The offered choice instead concerns a different principle: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. Those technical conditions are not interchangeable.