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Difficulty: Very hardNetwork Hardware Devices

A network infrastructure team is deploying physical hardware components across an enterprise campus expansion. The architecture requires specialized hardware to handle incoming fiber demarcation, centralized wireless management, application server traffic distribution, and power delivery over copper runs without upgrading legacy switches. Match each network hardware device to its primary operational function and deployment scenario.

  • Optical Network Terminal (ONT)Converts optical light signals from a fiber-optic ISP drop into standard electrical Ethernet signals at the customer demarcation point.
  • Wireless LAN Controller (WLC)Centralizes configuration profiles, SSIDs, security policies, and dynamic RF channel assignments for multiple lightweight access points.
  • Load BalancerMonitors backend server health and distributes incoming client requests across multiple nodes to prevent individual server overload.
  • PoE InjectorSplices direct current electrical power into an unshielded twisted-pair network cable run to power an end device when the upstream switch is non-PoE capable.

Answer

Optical Network Terminal (ONT) matches with converting optical light signals into electrical Ethernet signals at the demarcation point. Wireless LAN Controller (WLC) matches with centralizing configuration and RF management across lightweight access points. Load Balancer matches with monitoring backend server health and distributing incoming client traffic across multiple server nodes. PoE Injector matches with adding electrical power into an Ethernet cable run when the upstream switch does not support Power over Ethernet.
The correct pairings align each hardware device with its exact physical or logical function: the ONT performs optical-to-electrical signal conversion at the demarcation point, the WLC manages lightweight access points centrally, the Load Balancer optimizes traffic distribution across application server clusters based on health probes, and the PoE Injector introduces power onto a copper cabling run to supply remote powered devices when using non-PoE switches.

Step-by-Step Solution

1
Analyze the fiber-optic Internet Service Provider demarcation requirement.
Identify that converting fiber-optic light pulses into electrical copper Ethernet signals requires an Optical Network Terminal (ONT).
FTTP installations require an ONT to interface between the optical distribution network and the local Ethernet network.
2
Analyze the centralized wireless infrastructure management requirement.
Identify that managing lightweight access points centrally for RF tuning, security, and SSIDs requires a Wireless LAN Controller (WLC).
Autonomous access points are managed individually, whereas lightweight access points require a centralized controller for unified control plane operations.
3
Analyze the application traffic distribution and server redundancy requirement.
Identify that distributing incoming requests based on health checks to prevent server overload requires a Load Balancer.
Load balancers perform health probes and run algorithms like round-robin or least-connections to divide client workloads across web or application server farms.
4
Analyze the legacy non-PoE switch power addition requirement.
Identify that injecting DC power into copper network lines without replacing legacy infrastructure requires a PoE Injector.
A PoE injector acts as a midspan power device, combining data from a non-PoE switch port with DC power to output a single PoE-compliant cable run.

Key Concept

Identifying specialized network hardware roles, deployment boundaries, and operational functions in enterprise and SOHO network architectures.
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Network Hardware Devices

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