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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 3

Question 20

A post-incident design review discusses the following: A core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. 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. Publish a site-level IPv6 addressing plan and review allocations before turn-up.
  3. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.
  4. Document platform support for /31 and standardize point-to-point allocations in IPAM.

Explanation

Correct Answer

D:

Document platform support for /31 and standardize point-to-point allocations in IPAM. This control targets the underlying design risk. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The follow-up acceptance check remains: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.

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: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A directly relevant preventive control is: Document platform support for /31 and standardize point-to-point allocations in IPAM.

B:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The repeat risk here is different: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A directly relevant preventive control is: Document platform support for /31 and standardize point-to-point allocations in IPAM.

C:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The repeat risk here is different: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A directly relevant preventive control is: Document platform support for /31 and standardize point-to-point allocations in IPAM.

Question 21

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 core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.
  2. Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.
  3. Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.
  4. Use a structured site and VLAN hierarchy with separate /64 segments within the organization’s larger allocation.

Explanation

Correct Answer

B:

Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link. This action addresses the stated design problem. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A practical confirmation is: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone acceptance record also captures this result.

Incorrect Answers

A:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The actual fault is governed by a different mechanism: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The needed response is: Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.

C:

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: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The needed response is: Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.

D:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The actual fault is governed by a different mechanism: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The needed response is: Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.

Question 22

In a technical design review: During a predeployment review for a university backbone, the team discovers this design gap: a core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Hierarchical IPv6 prefix planning supports route summarization and stable per-link /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

C:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The correct engineering response is: Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link. The observable check is: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone 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 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.

B:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. 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.

D:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. 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 23

An engineering reviewer needs objective proof for the following: During a predeployment review for a university backbone, the team discovers this design gap: a core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.
  2. Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability.
  3. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.
  4. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone acceptance record also captures this result.

Explanation

Correct Answer

D:

Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone acceptance record also captures this result. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.

Incorrect Answers

A:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. In the case being tested, RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The necessary acceptance evidence is: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone acceptance record also captures this result.

B:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. In the case being tested, RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The necessary acceptance evidence is: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone acceptance record also captures this result.

C:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. In the case being tested, RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The necessary acceptance evidence is: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone acceptance record also captures this result.

Question 24

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: a core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. 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. Apply the same control to the university backbone rollout checklist.
  2. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.
  3. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.
  4. Record expected host growth and address reservations before assigning a VLAN prefix.

Explanation

Correct Answer

A:

Document platform support for /31 and standardize point-to-point allocations in IPAM. Apply the same control to the university backbone rollout checklist. This control targets the underlying design risk. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. The follow-up acceptance check remains: Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. The university backbone 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 repeat risk here is different: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A directly relevant preventive control is: Document platform support for /31 and standardize point-to-point allocations in IPAM. Apply the same control to the university backbone rollout checklist.

C:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The repeat risk here is different: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A directly relevant preventive control is: Document platform support for /31 and standardize point-to-point allocations in IPAM. Apply the same control to the university backbone rollout checklist.

D:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The repeat risk here is different: RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. A directly relevant preventive control is: Document platform support for /31 and standardize point-to-point allocations in IPAM. Apply the same control to the university backbone rollout checklist.

Question 25

A design team must resolve this enterprise network problem: An IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. Which action MOST DIRECTLY meets the stated design requirement?

  1. Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.
  2. Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.
  3. Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.
  4. Use a structured site and VLAN hierarchy with separate /64 segments within the organization’s larger allocation.

Explanation

Correct Answer

C:

Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites. This action addresses the stated design problem. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. A practical confirmation is: Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability.

Incorrect Answers

A:

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: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The needed response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

B:

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: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The needed response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

D:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The actual fault is governed by a different mechanism: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The needed response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

Question 26

The design record describes this issue: An IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. Which technical principle BEST explains the design decision?

  1. Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets.
  2. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.
  3. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.
  4. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.

Explanation

Correct Answer

D:

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.

Incorrect Answers

A:

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.

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: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. 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: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. Those technical conditions are not interchangeable.

Question 27

After designing a change for the following scenario: An IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. 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. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.
  3. Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.
  4. The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

Explanation

Correct Answer

A:

Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.

Incorrect Answers

B:

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.

C:

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.

D:

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.

Question 28

A preventive architecture review covers this situation: An IPv6 enterprise wants consistent addressing across 70 routed VLANs and has a provider-delegated /48. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Record expected host growth and address reservations before assigning a VLAN prefix.
  2. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.
  3. Maintain an address management registry and enforce aggregate boundaries during branch allocations.
  4. Document the stub-area boundary and check router area-type consistency.

Explanation

Correct Answer

B:

Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes. 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.

Incorrect Answers

A:

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.

C:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. 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.

D:

An OSPF stub area restricts external Type 5 LSA flooding while permitting interarea reachability as designed. 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.

Question 29

A new campus or WAN review presents this constraint: 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 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. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.
  3. Design metrics and path diversity with the EIGRP feasibility condition in mind rather than assuming all backups are feasible successors.
  4. Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

Explanation

Correct Answer

D:

Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites. This action addresses the stated design problem. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. A practical confirmation 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

A:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The actual fault is governed by a different mechanism: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The needed response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

B:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The actual fault is governed by a different mechanism: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The needed response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

C:

A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. The actual fault is governed by a different mechanism: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The needed response is: Assign a unique /64 to each VLAN from the delegated /48 while reserving structured blocks for future sites.

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.