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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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Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

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Cisco 300-420 Practice Test 1

Question 1

A Cisco enterprise designer reviews the following scenario: A rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. 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. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.
  3. Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.
  4. Use a structured site and VLAN hierarchy with separate /64 segments within the organization’s larger allocation.

Explanation

Correct Answer

A:

Allocate at least a /25 for the present host count and separately reserve adjacent space for growth. This action addresses the stated design problem. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A practical confirmation is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

Incorrect Answers

B:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The actual fault is governed by a different mechanism: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The needed response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.

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: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The needed response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.

D:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The actual fault is governed by a different mechanism: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The needed response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.

Question 2

The network architecture board discusses the following: A rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. 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. Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets.
  4. Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes.

Explanation

Correct Answer

B:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The correct engineering response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth. The observable check is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

Incorrect Answers

A:

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

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

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. 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 3

The infrastructure team must validate this situation: A rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. 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. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.
  3. The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.
  4. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.

Explanation

Correct Answer

C:

The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.

Incorrect Answers

A:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. In the case being tested, a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The necessary acceptance evidence is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

B:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. In the case being tested, a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The necessary acceptance evidence is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

D:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. In the case being tested, a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The necessary acceptance evidence is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

Question 4

A post-incident design review discusses the following: A rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Publish a site-level IPv6 addressing plan and review allocations before turn-up.
  2. Document platform support for /31 and standardize point-to-point allocations in IPAM.
  3. Maintain an address management registry and enforce aggregate boundaries during branch allocations.
  4. Record expected host growth and address reservations before assigning a VLAN prefix.

Explanation

Correct Answer

D:

Record expected host growth and address reservations before assigning a VLAN prefix. This control targets the underlying design risk. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The follow-up acceptance check remains: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets.

Incorrect Answers

A:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The repeat risk here is different: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A directly relevant preventive control is: Record expected host growth and address reservations before assigning a VLAN prefix.

B:

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: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A directly relevant preventive control is: Record expected host growth and address reservations before assigning a VLAN prefix.

C:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The repeat risk here is different: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A directly relevant preventive control is: Record expected host growth and address reservations before assigning a VLAN prefix.

Question 5

During a network design workshop, the team finds this issue: During a predeployment review for a multisite healthcare network, the team discovers this design gap: a rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. 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. Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.
  3. Use suitable /31 IPv4 addressing on compatible point-to-point links rather than a /24 on each link.
  4. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.

Explanation

Correct Answer

B:

Allocate at least a /25 for the present host count and separately reserve adjacent space for growth. This action addresses the stated design problem. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A practical confirmation is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare 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: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The needed response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.

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: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The needed response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.

D:

Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity. The actual fault is governed by a different mechanism: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The needed response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.

Question 6

In a technical design review: During a predeployment review for a multisite healthcare network, the team discovers this design gap: a rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. 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. RFC 3021 /31s can use both addresses on point-to-point links without ordinary network and broadcast host reservations.
  3. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.
  4. Contiguous nonoverlapping prefixes can be summarized at a network boundary, reducing routing-table complexity.

Explanation

Correct Answer

C:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The correct engineering response is: Allocate at least a /25 for the present host count and separately reserve adjacent space for growth. The observable check is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network acceptance record also captures this result.

Incorrect Answers

A:

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

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

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. 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 7

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 rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.
  2. Both router endpoints exchange routes and ping one another over a /31 while the overall address pool is conserved.
  3. Branch prefixes fall inside the advertised aggregate and reachability tests confirm no unintended addresses are drawn into the summary.
  4. The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network acceptance record also captures this result.

Explanation

Correct Answer

D:

The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network acceptance record also captures this result. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints.

Incorrect Answers

A:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. In the case being tested, a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The necessary acceptance evidence is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network acceptance record also captures this result.

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, a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The necessary acceptance evidence is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network 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, a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The necessary acceptance evidence is: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network acceptance record also captures this result.

Question 8

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 rapidly expanding regional site has 108 end hosts but its design allocates only a /26 IPv4 user subnet. 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. Record expected host growth and address reservations before assigning a VLAN prefix. Apply the same control to the multisite healthcare network rollout checklist.
  2. Document platform support for /31 and standardize point-to-point allocations in IPAM.
  3. Reserve hierarchy by region and use automated checks to prevent overlapping IPv6 prefixes.
  4. Check for overlapping prefixes during acquisitions and maintain authoritative IP address inventories.

Explanation

Correct Answer

A:

Record expected host growth and address reservations before assigning a VLAN prefix. Apply the same control to the multisite healthcare network rollout checklist. This control targets the underlying design risk. A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The follow-up acceptance check remains: The approved subnet provides 126 usable addresses and 108 endpoints can obtain unique leases without overlapping other subnets. The multisite healthcare network acceptance record also captures this result.

Incorrect Answers

B:

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: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A directly relevant preventive control is: Record expected host growth and address reservations before assigning a VLAN prefix. Apply the same control to the multisite healthcare network 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: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A directly relevant preventive control is: Record expected host growth and address reservations before assigning a VLAN prefix. Apply the same control to the multisite healthcare network rollout checklist.

D:

Overlapping private address space prevents unambiguous ordinary IP routing between identical prefixes. The repeat risk here is different: a /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. A directly relevant preventive control is: Record expected host growth and address reservations before assigning a VLAN prefix. Apply the same control to the multisite healthcare network rollout checklist.

Question 9

A design team must resolve this enterprise network problem: Several branches received scattered /24 IPv4 prefixes, forcing hundreds of individual route entries across the enterprise core. 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. Use a structured site and VLAN hierarchy with separate /64 segments within the organization’s larger allocation.
  3. Replan branches with contiguous, hierarchical address blocks and advertise appropriately scoped summaries.
  4. Create a renumbering and conflict-remediation plan before joining the overlapping networks.

Explanation

Correct Answer

C:

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.

Incorrect Answers

A:

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.

B:

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

D:

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.

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.