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Difficulty: Very hardRemote Access and Out-of-Band Management

A network engineer must implement a true out-of-band (OOB) remote management architecture for a critical enterprise data center. During a widespread core routing outage where the primary WAN connection and internal IP infrastructure are completely unreachable, the administrator needs direct console-level command-line access to reconfigure core switches. Which solution meets these out-of-band remote access and resilience requirements?

  1. Connect the serial console ports of all core devices to an OOB console terminal server equipped with a dedicated cellular modem connection.Answer
  2. B
    Configure an IP-KVM switch connected to the primary in-band management VLAN and allow SSH access over TCP port 23 across the primary gateway.
  3. C
    Deploy SNMPv2c agents over UDP port 161 on all core device primary interfaces to issue automated reboot commands during a link loss event.
  4. D
    Configure TACACS+ over UDP port 49 on the primary default gateway router to enable encrypted out-of-band console sessions.

Answer

Connecting the serial console ports of core devices to an out-of-band console terminal server backed by a dedicated cellular modem provides true out-of-band management independent of primary IP network availability.
The correct option describes a true out-of-band (OOB) management solution. Connecting physical serial console ports to a console terminal server with a dedicated cellular modem ensures administrators can reach network hardware CLI shells even when all primary wired ISP links, switches, and internal IP routing protocols have failed.

Step-by-Step Solution

1
Analyze the outage condition and management requirements.
Identified that primary WAN links and internal IP routing are fully down, eliminating all in-band IP-based management paths.
Out-of-band (OOB) access requires a completely isolated media path that does not depend on the operational state of the primary network hardware or IP routing stack.
2
Evaluate hardware interface requirements for console-level control.
Serial console (RS-232/RJ-45 console) connections directly communicate with device bootloaders and shells without requiring active IP stacks on the target network devices.
Terminal servers (console servers) pool these serial connections into a central management node.
3
Select the independent transmission medium for external connection.
A dedicated cellular modem interface attached to the terminal server allows administrators to dial in externally when landline ISP connections fail.
Cellular connectivity operates completely out-of-band from the site's primary wired internet infrastructure.

Key Concept

Out-of-Band (OOB) Management and Console Servers
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Topics

Remote Access and Out-of-Band Management

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