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Question

Difficulty: MediumRemote Access and Out-of-Band Management

A network administrator needs to perform remote power management on individual rack-mounted network devices in a server room. Specifically, when an appliance experiences an operating system freeze and stops responding to network traffic, the administrator must be able to reboot the specific device by toggling its electrical receptacle remotely over the network. Which device should be installed to meet this requirement?

  1. Switched Power Distribution Unit (PDU)Answer
  2. B
    Serial Terminal Server
  3. C
    Telnet gateway running on Port 23
  4. D
    SNMPv2c network monitoring agent

Answer

Switched Power Distribution Unit (PDU)
A switched Power Distribution Unit (PDU) features intelligent network-connected management interfaces that allow network engineers to power-cycle individual electrical outlets remotely. This provides out-of-band power management to force a hard reboot on hardware whose operating system or network stack has completely crashed.

Step-by-Step Solution

1
Identify the administrative requirement in the scenario.
The goal is to remotely power cycle (hard reboot) an individual device whose operating system has frozen.
When an OS hangs, software-based in-band protocols (such as SSH, RDP, or Telnet) become completely unresponsive.
2
Evaluate hardware capabilities for out-of-band power management.
A Switched PDU provides network-addressable power outlets that can be toggled on and off independently.
It operates independently of the managed target device's operating system state.

Key Concept

Remote Power Management and Switched PDUs
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Topics

Remote Access and Out-of-Band Management

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