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Difficulty: MediumNetwork Hardware Devices

A network administrator is designing an intermediate distribution frame (IDF) deployment for a newly renovated office area. The floor hosts three distinct logical subnets—Administrative, Sales, and Voice over IP (VoIP). The newly deployed IP telephones and wireless access points require network data connectivity alongside inline Power over Ethernet (PoE) to eliminate local AC adapters. Which of the following hardware deployment strategies would successfully route traffic between the subnets while delivering inline power to the endpoints? (Select TWO.)

  1. Deploying a PoE-capable Layer 3 switch configured for inter-VLAN routingAnswer
  2. Deploying a PoE-capable Layer 2 switch connected to a Layer 3 routerAnswer
  3. C
    Deploying an unmanaged Layer 2 switch to interconnect and route traffic between subnets
  4. D
    Deploying a standalone DNS server to handle IP address leasing and inter-subnet packet forwarding

Answer

The two valid strategies are deploying a PoE-capable Layer 3 switch configured for inter-VLAN routing, and deploying a PoE-capable Layer 2 switch connected to a Layer 3 router.
To satisfy both requirements—delivering Power over Ethernet (PoE) to endpoints and routing traffic between distinct logical IP subnets—the network design must incorporate PoE-capable switching hardware alongside Layer 3 routing functionality. A Layer 3 switch with PoE combines both capabilities into a single device. Alternatively, pairing a Layer 2 PoE switch for power/switching with an external Layer 3 router for inter-subnet forwarding also achieves the desired design.

Step-by-Step Solution

1
Analyze the inline power requirement for VoIP phones and access points.
Identified that the access layer switch must support Power over Ethernet (PoE/PoE+) standards to send power over twisted-pair Ethernet cables.
Eliminates local power adapters for powered network endpoints.
2
Analyze the inter-subnet communication requirement.
Identified that inter-VLAN/inter-subnet routing requires Layer 3 packet processing capability.
Layer 2 devices only forward frames within a single broadcast domain.
3
Evaluate hardware deployment options that fulfill both requirements simultaneously.
Determined that either a single Layer 3 switch with integrated PoE support or a dedicated Layer 2 PoE switch paired with a Layer 3 router successfully meets both criteria.
Both architectures provide Layer 3 boundary routing alongside Layer 2 Power over Ethernet sourcing.

Key Concept

Network Hardware Device Functions and OSI Layer Operations
Estimated Time:1m 30s
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Topics

Network Hardware Devices

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