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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 2

Question 10

The design record describes this issue: Several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. Which technical principle BEST explains the design decision?

  1. Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets.
  2. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.
  3. IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets.
  4. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.

Explanation

Correct Answer

D:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The correct engineering response is: Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries. The observable check is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.

Incorrect Answers

A:

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

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

C:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The offered choice instead concerns a different principle: IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. Those technical conditions are not interchangeable.

Question 11

After designing a change for the following scenario: Several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. Which acceptance observation BEST establishes the intended result?

  1. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.
  2. Traffic to both formerly overlapping destinations follows the intended routes after renumbering or a documented translation boundary.
  3. The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.
  4. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.

Explanation

Correct Answer

A:

Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.

Incorrect Answers

B:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. In the case being tested, Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The necessary acceptance evidence is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.

C:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. In the case being tested, Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The necessary acceptance evidence is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.

D:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. In the case being tested, Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The necessary acceptance evidence is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.

Question 12

A preventive architecture review covers this situation: Several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.
  2. Maintain an address management registry and enforce aggregate boundaries during branch allocations.
  3. Publish a site-level IPv6 addressing plan and review allocations before turn-up.
  4. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.

Explanation

Correct Answer

B:

Maintain an address management registry and enforce aggregate boundaries during branch allocations. This control targets the underlying design risk. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The follow-up acceptance check remains: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.

Incorrect Answers

A:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The repeat risk here is different: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A directly relevant preventive control is: Maintain an address management registry and enforce aggregate boundaries during branch allocations.

C:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The repeat risk here is different: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A directly relevant preventive control is: Maintain an address management registry and enforce aggregate boundaries during branch allocations.

D:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. The repeat risk here is different: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A directly relevant preventive control is: Maintain an address management registry and enforce aggregate boundaries during branch allocations.

Question 13

A new campus or WAN review presents this constraint: During a predeployment review for a distributed retail network, the team discovers this design gap: several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Create a renumbering and conflict-remediation plan before joining the overlapping networks.
  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. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.

Explanation

Correct Answer

D:

Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries. This action addresses the stated design problem. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A practical confirmation is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.

Incorrect Answers

A:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The actual fault is governed by a different mechanism: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The needed response is: Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.

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: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The needed response is: Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.

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: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The needed response is: Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.

Question 14

For this Cisco ENSLD design case: During a predeployment review for a distributed retail network, the team discovers this design gap: several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.
  2. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.
  3. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.
  4. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.

Explanation

Correct Answer

A:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The correct engineering response is: Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries. The observable check is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.

Incorrect Answers

B:

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

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

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. 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 15

During acceptance testing for this network design: During a predeployment review for a distributed retail network, the team discovers this design gap: several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. 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. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.
  3. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.
  4. Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability.

Explanation

Correct Answer

B:

Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.

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, Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The necessary acceptance evidence is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.

C:

RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations. In the case being tested, Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The necessary acceptance evidence is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.

D:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. In the case being tested, Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The necessary acceptance evidence is: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.

Question 16

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a distributed retail network, the team discovers this design gap: several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. 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. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.
  2. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.
  3. Maintain an address management registry and enforce aggregate boundaries during branch allocations. Apply the same control to the distributed retail network rollout checklist.
  4. Document platform support for /31 and standardize point-to-point allocations in IPAM.

Explanation

Correct Answer

C:

Maintain an address management registry and enforce aggregate boundaries during branch allocations. Apply the same control to the distributed retail network rollout checklist. This control targets the underlying design risk. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The follow-up acceptance check remains: Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary. The distributed retail network acceptance record also captures this result.

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: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A directly relevant preventive control is: Maintain an address management registry and enforce aggregate boundaries during branch allocations. Apply the same control to the distributed retail network rollout checklist.

B:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The repeat risk here is different: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A directly relevant preventive control is: Maintain an address management registry and enforce aggregate boundaries during branch allocations. Apply the same control to the distributed retail network 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: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. A directly relevant preventive control is: Maintain an address management registry and enforce aggregate boundaries during branch allocations. Apply the same control to the distributed retail network rollout checklist.

Question 17

A Cisco enterprise designer reviews the following scenario: A core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.
  2. Create a renumbering and conflict-remediation plan before joining the overlapping networks.
  3. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.
  4. Keep OSPF enabled only on deliberate transit interfaces and make end-user interfaces passive where supported.

Explanation

Correct Answer

A:

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.

Incorrect Answers

B:

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

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.

D:

Passive OSPF interfaces advertise their connected networks without forming unnecessary neighbor adjacencies. 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 18

The network architecture board discusses the following: A core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. Which technical principle BEST explains the design decision?

  1. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.
  2. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.
  3. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.
  4. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules.

Explanation

Correct Answer

B:

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.

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: Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. Those technical conditions are not interchangeable.

C:

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: Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. 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: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. Those technical conditions are not interchangeable.

Question 19

The infrastructure team must validate this situation: A core design wastes /24 subnets on each of thirty numbered router-to-router Ethernet links. 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. The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.
  3. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.
  4. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.

Explanation

Correct Answer

C:

Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved. 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.

B:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. 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.

D:

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

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.