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Difficulty: HardRemote Access and Out-of-Band Management

An organization is deploying an edge computing cabinet at a remote manufacturing facility that frequently experiences complete primary ISP fiber outages. The network operations team must maintain secure command-line access to core switches for initial boot troubleshooting and possess the ability to hard-reboot frozen hardware remotely without relying on local site staff or the primary WAN link. Which of the following solutions best satisfies both the out-of-band reachability and remote power management requirements?

  1. Deploying a serial console server connected to the network devices' console ports and paired with an external cellular modem, along with a switched Power Distribution Unit (PDU) managed securely via SSH.Answer
  2. B
    Configuring in-band SSH access on the switch management VLAN over the primary ISP gateway, combined with an unmanaged Power Distribution Unit (PDU) connected to an Uninterruptible Power Supply (UPS).
  3. C
    Establishing a remote Telnet session over port 23 to an IP-KVM switch attached to the primary WAN port, along with automated SNMPv2 traps to handle device reboots.
  4. D
    Setting up a TFTP server over UDP port 69 on the local gateway router to push recovery scripts, paired with a standard analog line connected to an in-band management port.

Answer

Deploying a serial console server connected to the network devices' console ports paired with a cellular modem and a switched Power Distribution Unit (PDU) managed via SSH.
The combination of a cellular modem and serial console server creates a dedicated Out-of-Band (OOB) channel independent of the primary ISP link. Coupling this with a switched Power Distribution Unit (PDU) controllable via encrypted SSH enables network administrators to interact with bare-metal console interfaces and execute hard power cycles on unresponsive network hardware during link failures.

Step-by-Step Solution

1
Identify the primary operational constraint.
The remote site suffers complete primary WAN (fiber) outages and potential OS freezes on network devices.
In-band management paths (such as standard WAN/VLAN IP paths) become unreachable whenever the primary network link or OS network stack goes down.
2
Determine the required Out-of-Band (OOB) architecture.
An independent communication path such as a cellular modem connected to a serial console/terminal server is required.
A console server provides low-level direct serial access to hardware command-line interfaces regardless of network protocol state.
3
Determine the power management mechanism.
A switched Power Distribution Unit (PDU) allows individual power outlets to be rebooted remotely via secure CLI (SSH) or management interfaces.
When a network device experiences a total system lockup, a hard power cycle via a switched PDU is the only remote remediation method.

Key Concept

Out-of-Band (OOB) Management and Remote Infrastructure Control
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Topics

Remote Access and Out-of-Band Management

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