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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 16

Question 150

In a technical design review: During a predeployment review for a multisite healthcare network, the team discovers this design gap: a remote OSPF area must import a limited external route locally but should not flood all backbone external LSAs inward. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.
  3. An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR.
  4. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information.

Explanation

Correct Answer

C:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The correct engineering response is: Use a properly designed not-so-stubby area and validate Type 7 translation at its ABR. The observable check is: The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent. The multisite healthcare network acceptance record also captures this result.

Incorrect Answers

A:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. 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.

B:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. 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 NSSA can originate Type 7 external information and translate it at an eligible ABR. 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.

Question 151

An engineering reviewer needs objective proof for the following: During a predeployment review for a multisite healthcare network, the team discovers this design gap: a remote OSPF area must import a limited external route locally but should not flood all backbone external LSAs inward. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. The area has no Type 5 external LSAs and still learns expected interarea routes or default access.
  2. The receiving area learns appropriate aggregates and retains working reachability to included component prefixes.
  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. The multisite healthcare network acceptance record also captures this result.

Explanation

Correct Answer

D:

The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent. The multisite healthcare network acceptance record also captures this result. An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR.

Incorrect Answers

A:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. In the case being tested, an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The necessary acceptance evidence is: The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent. The multisite healthcare network acceptance record also captures this result.

B:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. In the case being tested, an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The necessary acceptance evidence is: The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent. The multisite healthcare network acceptance record also captures this result.

C:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. In the case being tested, an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The necessary acceptance evidence is: The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent. The multisite healthcare network acceptance record also captures this result.

Question 152

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: a remote OSPF area must import a limited external route locally but should not flood all backbone external LSAs inward. 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. Review NSSA translator redundancy and route-leak policy before rollout. Apply the same control to the multisite healthcare network rollout checklist.
  2. Review area connectivity on topology diagrams before deploying new OSPF sites.
  3. Allocate prefixes by area and test summary behavior during partial site outages.
  4. Document the stub-area boundary and check router area-type consistency.

Explanation

Correct Answer

A:

Review NSSA translator redundancy and route-leak policy before rollout. Apply the same control to the multisite healthcare network rollout checklist. This control targets the underlying design risk. An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. The follow-up acceptance check remains: The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent. The multisite healthcare network acceptance record also captures this result.

Incorrect Answers

B:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The repeat risk here is different: an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. A directly relevant preventive control is: Review NSSA translator redundancy and route-leak policy before rollout. Apply the same control to the multisite healthcare network rollout checklist.

C:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The repeat risk here is different: an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. A directly relevant preventive control is: Review NSSA translator redundancy and route-leak policy before rollout. Apply the same control to the multisite healthcare network rollout checklist.

D:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. The repeat risk here is different: an OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. A directly relevant preventive control is: Review NSSA translator redundancy and route-leak policy before rollout. Apply the same control to the multisite healthcare network rollout checklist.

Question 153

A design team must resolve this enterprise network problem: An OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. 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. Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.
  3. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.
  4. Configure remote EIGRP spokes as stubs with appropriate advertised route types.

Explanation

Correct Answer

C:

Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported. This action addresses the stated design problem. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A practical confirmation is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

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: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The needed response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

B:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The actual fault is governed by a different mechanism: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The needed response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

D:

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: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The needed response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

Question 154

The design record describes this issue: An OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. 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. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas.
  3. An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR.
  4. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.

Explanation

Correct Answer

D:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The correct engineering response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported. The observable check is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

Incorrect Answers

A:

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

B:

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

C:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. 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 155

After designing a change for the following scenario: An OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. Which acceptance observation BEST establishes the intended result?

  1. Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.
  2. The local redistributed prefix appears via the correct NSSA translation behavior and prohibited external floods remain absent.
  3. ABRs report appropriate area membership and interarea routes resolve through the intended backbone.
  4. The area has no Type 5 external LSAs and still learns expected interarea routes or default access.

Explanation

Correct Answer

A:

Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.

Incorrect Answers

B:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. In the case being tested, Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The necessary acceptance evidence is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

C:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. In the case being tested, Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The necessary acceptance evidence is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

D:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. In the case being tested, Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The necessary acceptance evidence is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

Question 156

A preventive architecture review covers this situation: An OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Review area connectivity on topology diagrams before deploying new OSPF sites.
  2. Use interface role templates and audit router-facing versus user-facing ports.
  3. Allocate prefixes by area and test summary behavior during partial site outages.
  4. Validate EIGRP successor and backup behavior during link-failure testing.

Explanation

Correct Answer

B:

Use interface role templates and audit router-facing versus user-facing ports. This control targets the underlying design risk. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The follow-up acceptance check remains: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies.

Incorrect Answers

A:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. The repeat risk here is different: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A directly relevant preventive control is: Use interface role templates and audit router-facing versus user-facing ports.

C:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The repeat risk here is different: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A directly relevant preventive control is: Use interface role templates and audit router-facing versus user-facing ports.

D:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The repeat risk here is different: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A directly relevant preventive control is: Use interface role templates and audit router-facing versus user-facing ports.

Question 157

A new campus or WAN review presents this constraint: During a predeployment review for a distributed retail network, the team discovers this design gap: an OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.
  3. Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.
  4. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

Explanation

Correct Answer

D:

Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported. This action addresses the stated design problem. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A practical confirmation is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result.

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: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The needed response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

B:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The actual fault is governed by a different mechanism: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The needed response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

C:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The actual fault is governed by a different mechanism: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The needed response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

Question 158

For this Cisco ENSLD design case: During a predeployment review for a distributed retail network, the team discovers this design gap: an OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.
  2. OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas.
  3. An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas.
  4. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.

Explanation

Correct Answer

A:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The correct engineering response is: Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported. The observable check is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result.

Incorrect Answers

B:

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

C:

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

D:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The offered choice instead concerns a different principle: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. Those technical conditions are not interchangeable.

Question 159

During acceptance testing for this network design: During a predeployment review for a distributed retail network, the team discovers this design gap: an OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

B:

Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies.

Incorrect Answers

A:

An OSPF NSSA can originate Type 7 external information and translate it at an eligible ABR. In the case being tested, Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The necessary acceptance evidence is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result.

C:

OSPF’s normal multiarea hierarchy uses Area 0 as the backbone connecting other areas. In the case being tested, Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The necessary acceptance evidence is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result.

D:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. In the case being tested, Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The necessary acceptance evidence is: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result.

Question 160

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a distributed retail network, the team discovers this design gap: an OSPF transit circuit flaps when two routers disagree about which side is authorized to join the routing process. 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. Document the stub-area boundary and check router area-type consistency.
  2. Allocate prefixes by area and test summary behavior during partial site outages.
  3. Use interface role templates and audit router-facing versus user-facing ports. Apply the same control to the distributed retail network rollout checklist.
  4. Review NSSA translator redundancy and route-leak policy before rollout.

Explanation

Correct Answer

C:

Use interface role templates and audit router-facing versus user-facing ports. Apply the same control to the distributed retail network rollout checklist. This control targets the underlying design risk. Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. The follow-up acceptance check remains: Transit neighbors reach Full state while access interfaces show no unsolicited OSPF adjacencies. The distributed retail network acceptance record also captures this result.

Incorrect Answers

A:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. The repeat risk here is different: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A directly relevant preventive control is: Use interface role templates and audit router-facing versus user-facing ports. Apply the same control to the distributed retail network rollout checklist.

B:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The repeat risk here is different: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A directly relevant preventive control is: Use interface role templates and audit router-facing versus user-facing ports. Apply the same control to the distributed retail network 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: Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. A directly relevant preventive control is: Use interface role templates and audit router-facing versus user-facing ports. Apply the same control to the distributed retail network rollout checklist.