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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 13

Question 120

The change advisory board sees a repeat risk in this case: During a predeployment review for a university backbone, the team discovers this design gap: an EIGRP migration changes metric K-values on just one of two intended peers and adjacency establishment fails. 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. Enforce a single approved EIGRP metric profile via configuration validation. Apply the same control to the university backbone rollout checklist.
  2. Make EIGRP stub status part of remote-site configuration templates.
  3. Check summary coverage against the live IPAM and planned branch growth.
  4. Validate EIGRP successor and backup behavior during link-failure testing.

Explanation

Correct Answer

A:

Enforce a single approved EIGRP metric profile via configuration validation. Apply the same control to the university backbone rollout checklist. This control targets the underlying design risk. A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The follow-up acceptance check remains: Peer adjacencies establish and routes enter the topology table after the K-values match. The university backbone acceptance record also captures this result.

Incorrect Answers

B:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The repeat risk here is different: a mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. A directly relevant preventive control is: Enforce a single approved EIGRP metric profile via configuration validation. Apply the same control to the university backbone rollout checklist.

C:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The repeat risk here is different: a mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. A directly relevant preventive control is: Enforce a single approved EIGRP metric profile via configuration validation. Apply the same control to the university backbone rollout checklist.

D:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The repeat risk here is different: a mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. A directly relevant preventive control is: Enforce a single approved EIGRP metric profile via configuration validation. Apply the same control to the university backbone rollout checklist.

Question 121

A design team must resolve this enterprise network problem: A multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate a stub-area design with all routers in the area using compatible area type.
  2. Use a properly designed not-so-stubby area and validate Type 7 translation at its ABR.
  3. Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.
  4. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

Explanation

Correct Answer

C:

Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone. This action addresses the stated design problem. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A practical confirmation is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone.

Incorrect Answers

A:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. The actual fault is governed by a different mechanism: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The needed response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

B:

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: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The needed response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

D:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The actual fault is governed by a different mechanism: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The needed response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

Question 122

The design record describes this issue: A multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. Which technical principle BEST explains the design decision?

  1. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.
  2. An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed.
  3. An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas.
  4. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas.

Explanation

Correct Answer

D:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The correct engineering response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone. The observable check is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone.

Incorrect Answers

A:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The offered choice instead concerns a different principle: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. Those technical conditions are not interchangeable.

B:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The offered choice instead concerns a different principle: an OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. Those technical conditions are not interchangeable.

C:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The offered choice instead concerns a different principle: an OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. Those technical conditions are not interchangeable.

Question 123

After designing a change for the following scenario: A multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. Which acceptance observation BEST establishes the intended result?

  1. ABRs report appropriate area membership and interarea routes resolve through the intended backbone.
  2. The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent.
  3. The receiving area learns appropriate aggregates and retains working reachability to included component prefixes.
  4. Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

Explanation

Correct Answer

A:

ABRs report appropriate area membership and interarea routes resolve through the intended backbone. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas.

Incorrect Answers

B:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. In the case being tested, OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The necessary acceptance evidence is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone.

C:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. In the case being tested, OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The necessary acceptance evidence is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone.

D:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. In the case being tested, OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The necessary acceptance evidence is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone.

Question 124

A preventive architecture review covers this situation: A multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Use interface role templates and audit router-facing versus user-facing ports.
  2. Review area connectivity on topology diagrams before deploying new OSPF sites.
  3. Document the stub-area boundary and check router area-type consistency.
  4. Review NSSA translator redundancy and route-leak policy before rollout.

Explanation

Correct Answer

B:

Review area connectivity on topology diagrams before deploying new OSPF sites. This control targets the underlying design risk. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The follow-up acceptance check remains: ABRs report appropriate area membership and interarea routes resolve through the intended backbone.

Incorrect Answers

A:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The repeat risk here is different: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A directly relevant preventive control is: Review area connectivity on topology diagrams before deploying new OSPF sites.

C:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. The repeat risk here is different: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A directly relevant preventive control is: Review area connectivity on topology diagrams before deploying new OSPF sites.

D:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The repeat risk here is different: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A directly relevant preventive control is: Review area connectivity on topology diagrams before deploying new OSPF sites.

Question 125

A new campus or WAN review presents this constraint: During a predeployment review for a logistics division, the team discovers this design gap: a multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.
  2. Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.
  3. Keep access routers in Level 1 and use appropriate Level 1-2 routers for interarea connectivity.
  4. Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

Explanation

Correct Answer

D:

Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone. This action addresses the stated design problem. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A practical confirmation is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.

Incorrect Answers

A:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The actual fault is governed by a different mechanism: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The needed response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

B:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The actual fault is governed by a different mechanism: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The needed response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

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: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The needed response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.

Question 126

For this Cisco ENSLD design case: During a predeployment review for a logistics division, the team discovers this design gap: a multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas.
  2. An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas.
  3. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.
  4. An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR.

Explanation

Correct Answer

A:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The correct engineering response is: Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone. The observable check is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.

Incorrect Answers

B:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The offered choice instead concerns a different principle: an OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. Those technical conditions are not interchangeable.

C:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The offered choice instead concerns a different principle: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. Those technical conditions are not interchangeable.

D:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The offered choice instead concerns a different principle: an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. Those technical conditions are not interchangeable.

Question 127

During acceptance testing for this network design: During a predeployment review for a logistics division, the team discovers this design gap: a multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. The receiving area learns appropriate aggregates and retains working reachability to included component prefixes.
  2. ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.
  3. Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.
  4. The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent.

Explanation

Correct Answer

B:

ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas.

Incorrect Answers

A:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. In the case being tested, OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The necessary acceptance evidence is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.

C:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. In the case being tested, OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The necessary acceptance evidence is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.

D:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. In the case being tested, OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The necessary acceptance evidence is: ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.

Question 128

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a logistics division, the team discovers this design gap: a multi-area OSPF design accidentally leaves one nonbackbone area disconnected from Area 0. 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. Use interface role templates and audit router-facing versus user-facing ports.
  2. Document the stub-area boundary and check router area-type consistency.
  3. Review area connectivity on topology diagrams before deploying new OSPF sites. Apply the same control to the logistics division rollout checklist.
  4. Review NSSA translator redundancy and route-leak policy before rollout.

Explanation

Correct Answer

C:

Review area connectivity on topology diagrams before deploying new OSPF sites. Apply the same control to the logistics division rollout checklist. This control targets the underlying design risk. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The follow-up acceptance check remains: ABRs report appropriate area membership and interarea routes resolve through the intended backbone. The logistics division acceptance record also captures this result.

Incorrect Answers

A:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The repeat risk here is different: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A directly relevant preventive control is: Review area connectivity on topology diagrams before deploying new OSPF sites. Apply the same control to the logistics division rollout checklist.

B:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. The repeat risk here is different: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A directly relevant preventive control is: Review area connectivity on topology diagrams before deploying new OSPF sites. Apply the same control to the logistics division rollout checklist.

D:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The repeat risk here is different: OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. A directly relevant preventive control is: Review area connectivity on topology diagrams before deploying new OSPF sites. Apply the same control to the logistics division rollout checklist.

Question 129

A Cisco enterprise designer reviews the following scenario: Thousands of individual access prefixes are injected between OSPF areas and cause excessive route-state churn. Which action MOST DIRECTLY meets the stated design requirement?

  1. Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.
  2. Use a properly designed not-so-stubby area and validate Type 7 translation at its ABR.
  3. Redesign area boundaries so ordinary interarea connectivity traverses the OSPF backbone.
  4. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

Explanation

Correct Answer

A:

Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations. This action addresses the stated design problem. An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. A practical confirmation is: The receiving area learns appropriate aggregates and retains working reachability to included component prefixes.

Incorrect Answers

B:

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: an OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The needed response is: Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.

C:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The actual fault is governed by a different mechanism: an OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The needed response is: Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.

D:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The actual fault is governed by a different mechanism: an OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The needed response is: Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.

Question 130

The network architecture board discusses the following: Thousands of individual access prefixes are injected between OSPF areas and cause excessive route-state churn. Which technical principle BEST explains the design decision?

  1. An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed.
  2. An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas.
  3. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.
  4. An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR.

Explanation

Correct Answer

B:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The correct engineering response is: Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations. The observable check is: The receiving area learns appropriate aggregates and retains working reachability to included component prefixes.

Incorrect Answers

A:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The offered choice instead concerns a different principle: an OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. Those technical conditions are not interchangeable.

C:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The offered choice instead concerns a different principle: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. Those technical conditions are not interchangeable.

D:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The offered choice instead concerns a different principle: an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. Those technical conditions are not interchangeable.