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Difficulty: MediumRemote Access and Out-of-Band Management

A network specialist is establishing remote out-of-band access for a core router stationed at a remote datacenter. The solution must allow administrators to access the router's CLI interface to troubleshoot system failures even if the primary WAN interface and local network operating system crash. Which of the following implementations best meets these requirements?

  1. Connecting a cellular-enabled terminal console server directly to the router's serial console port.Answer
  2. B
    Configuring a Telnet connection over port 22 on the router's primary ethernet management interface.
  3. C
    Setting up an SNMPv2c agent on the router to execute configuration commands over UDP port 161.
  4. D
    Deploying a RADIUS server on the internal subnet to encapsulate serial interface signals across the primary LAN.

Answer

Connecting a cellular-enabled terminal console server directly to the router's serial console port provides dedicated out-of-band management independent of primary network links.
Out-of-band management provides a distinct physical or logical pathway—such as a cellular modem paired with a console server attached to the router's RS-232 serial console port—enabling command-line access even when primary WAN links or local interface drivers are unavailable.

Step-by-Step Solution

1
Identify the operational constraint and access requirement.
The solution requires access during total WAN failure and network OS crashes.
In-band solutions (like SSH or SNMP over primary Ethernet interfaces) rely on active network interfaces and running OS stacks, which fail during major link or system outages.
2
Evaluate alternative management channels.
Out-of-band (OOB) management using a dedicated cellular modem and console server bypasses the production network.
Connecting directly to the serial console port allows low-level CLI access regardless of internal IP interface status.

Key Concept

Out-of-Band (OOB) Management
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Topics

Remote Access and Out-of-Band Management

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