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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 4

Question 30

For this Cisco ENSLD design case: During a predeployment review for a logistics division, the team discovers this design gap: an IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.
  2. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.
  3. Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets.
  4. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.

Explanation

Correct Answer

A:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The correct engineering response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites. The observable check is: Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result.

Incorrect Answers

B:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The offered choice instead concerns a different principle: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. Those technical conditions are not interchangeable.

C:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The offered choice instead concerns a different principle: Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. Those technical conditions are not interchangeable.

D:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. 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 31

During acceptance testing for this network design: During a predeployment review for a logistics division, the team discovers this design gap: an IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.
  2. Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result.
  3. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.
  4. Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

Explanation

Correct Answer

B:

Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.

Incorrect Answers

A:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. In the case being tested, IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The necessary acceptance evidence is: Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result.

C:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. In the case being tested, IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The necessary acceptance evidence is: Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result.

D:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. In the case being tested, IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The necessary acceptance evidence is: Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result.

Question 32

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a logistics division, the team discovers this design gap: an IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. 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 platform support for /31 and standardize point-to-point allocations in IPAM.
  2. Record expected host growth and address reservations before assigning a VLAN prefix.
  3. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes. Apply the same control to the logistics division rollout checklist.
  4. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.

Explanation

Correct Answer

C:

Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes. Apply the same control to the logistics division rollout checklist. This control targets the underlying design risk. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The follow-up acceptance check remains: Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. The logistics division acceptance record also captures this result.

Incorrect Answers

A:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The repeat risk here is different: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. A directly relevant preventive control is: Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes. Apply the same control to the logistics division rollout checklist.

B:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The repeat risk here is different: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. A directly relevant preventive control is: Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes. Apply the same control to the logistics division rollout checklist.

D:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The repeat risk here is different: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. A directly relevant preventive control is: Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes. Apply the same control to the logistics division rollout checklist.

Question 33

A Cisco enterprise designer reviews the following scenario: Two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. Which action MOST DIRECTLY meets the stated design requirement?

  1. Create a renumbering and conflict-remediation plan before joining the overlapping networks.
  2. Use a structured site and VLAN hierarchy with separate /64 segments within the organization’s larger allocation.
  3. Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.
  4. Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

Explanation

Correct Answer

A:

Create a renumbering and conflict-remediation plan before joining the overlapping networks. This action addresses the stated design problem. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A practical confirmation is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

Incorrect Answers

B:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The actual fault is governed by a different mechanism: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The needed response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks.

C:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The actual fault is governed by a different mechanism: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The needed response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks.

D:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The actual fault is governed by a different mechanism: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The needed response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks.

Question 34

The network architecture board discusses the following: Two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. Which technical principle BEST explains the design decision?

  1. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.
  2. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.
  3. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.
  4. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.

Explanation

Correct Answer

B:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The correct engineering response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks. The observable check is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

Incorrect Answers

A:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. 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.

C:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. 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.

D:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The offered choice instead concerns a different principle: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. Those technical conditions are not interchangeable.

Question 35

The infrastructure team must validate this situation: Two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. Which acceptance observation BEST establishes the intended result?

  1. Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability.
  2. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.
  3. Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.
  4. Traffic to each intended component prefix succeeds and unused portions of the summary are not inadvertently advertised.

Explanation

Correct Answer

C:

Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.

Incorrect Answers

A:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. In the case being tested, Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The necessary acceptance evidence is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

B:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. In the case being tested, Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The necessary acceptance evidence is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

D:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. In the case being tested, Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The necessary acceptance evidence is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

Question 36

A post-incident design review discusses the following: Two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.
  2. Record expected host growth and address reservations before assigning a VLAN prefix.
  3. Maintain an address management registry and enforce aggregate boundaries during branch allocations.
  4. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.

Explanation

Correct Answer

D:

Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories. This control targets the underlying design risk. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The follow-up acceptance check remains: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.

Incorrect Answers

A:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The repeat risk here is different: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A directly relevant preventive control is: Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.

B:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The repeat risk here is different: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A directly relevant preventive control is: Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.

C:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The repeat risk here is different: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A directly relevant preventive control is: Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.

Question 37

During a network design workshop, the team finds this issue: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. 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 a structured site and VLAN hierarchy with separate /64 segments within the organization’s larger allocation.
  2. Create a renumbering and conflict-remediation plan before joining the overlapping networks.
  3. Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.
  4. Make EIGRP metric K-values consistent across peers that must form an adjacency.

Explanation

Correct Answer

B:

Create a renumbering and conflict-remediation plan before joining the overlapping networks. This action addresses the stated design problem. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A practical confirmation is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

Incorrect Answers

A:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The actual fault is governed by a different mechanism: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The needed response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks.

C:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The actual fault is governed by a different mechanism: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The needed response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks.

D:

A mismatch in EIGRP K-values prevents neighbor compatibility for route exchange. The actual fault is governed by a different mechanism: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The needed response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks.

Question 38

In a technical design review: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.
  2. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.
  3. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.
  4. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.

Explanation

Correct Answer

C:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The correct engineering response is: Create a renumbering and conflict-remediation plan before joining the overlapping networks. The observable check is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

Incorrect Answers

A:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. 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.

B:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The offered choice instead concerns a different principle: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. Those technical conditions are not interchangeable.

D:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. 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.

Question 39

An engineering reviewer needs objective proof for the following: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.
  2. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.
  3. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.
  4. Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

Explanation

Correct Answer

D:

Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.

Incorrect Answers

A:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. In the case being tested, Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The necessary acceptance evidence is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

B:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. In the case being tested, Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The necessary acceptance evidence is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

C:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. In the case being tested, Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The necessary acceptance evidence is: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

Question 40

The change advisory board sees a repeat risk in this case: During a predeployment review for a manufacturing regional hub, the team discovers this design gap: two subsidiaries independently choose the same RFC 1918 prefixes and a merger creates ambiguous VPN routing. 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. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories. Apply the same control to the manufacturing regional hub rollout checklist.
  2. Maintain an address management registry and enforce aggregate boundaries during branch allocations.
  3. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.
  4. Document platform support for /31 and standardize point-to-point allocations in IPAM.

Explanation

Correct Answer

A:

Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories. Apply the same control to the manufacturing regional hub rollout checklist. This control targets the underlying design risk. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The follow-up acceptance check remains: Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary. The manufacturing regional hub acceptance record also captures this result.

Incorrect Answers

B:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The repeat risk here is different: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A directly relevant preventive control is: Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories. Apply the same control to the manufacturing regional hub rollout checklist.

C:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The repeat risk here is different: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A directly relevant preventive control is: Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories. Apply the same control to the manufacturing regional hub rollout checklist.

D:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The repeat risk here is different: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. A directly relevant preventive control is: Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories. Apply the same control to the manufacturing regional hub rollout checklist.