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Difficulty: MediumRemote Access and Out-of-Band Management

During a maintenance window, a network technician inadvertently removes the IP address configuration from a core switch's primary VLAN interface, causing all active remote management sessions to drop. The switch remains powered on and operational, but it is no longer reachable across the local area network. Which of the following physical management methods should the technician use to regain command-line access to the switch?

  1. Connect an RS-232 serial cable directly from a management workstation to the switch console port.Answer
  2. B
    Establish an SSH session on TCP port 22 targeting the switch default gateway address.
  3. C
    Initiate an unencrypted Telnet connection over UDP port 23 to broadcast an administrative recovery frame.
  4. D
    Launch an RDP connection on TCP port 3389 to access the switch desktop management utility.

Answer

Connecting an RS-232 serial cable directly from a management workstation to the switch console port.
Out-of-band (OOB) management via a direct serial console connection operates independently of the IP protocol stack and network interface status. Connecting directly to the device console port using an RS-232 serial cable allows full administrative access to the command-line interface even when network IP addresses are absent or misconfigured.

Step-by-Step Solution

1
Analyze the failure domain described in the scenario.
In-band connectivity is lost because the Layer 3 IP address configuration on the target device was deleted.
Network protocols requiring IP connectivity (such as SSH, Telnet, HTTPS, RDP) cannot route traffic to an unaddressed network interface.
2
Identify the appropriate management architecture required for recovery.
Out-of-band (OOB) access via local physical serial connection is needed.
Direct console access connects to the terminal hardware controller directly and operates independently of network interface state or IP addressing.
3
Select the correct physical medium and connection protocol.
An RS-232 serial connection using a console cable attached to the dedicated console port provides direct CLI interface access.
This allows the administrator to re-enter IP configuration commands directly without relying on network packet routing.

Key Concept

Out-of-Band (OOB) Console Management
Estimated Time:1m 30s
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Topics

Remote Access and Out-of-Band Management

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