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Difficulty: MediumRemote Access and Out-of-Band Management

A network administrator is designing an out-of-band (OOB) management solution for a remote distribution facility to ensure administrative access and recovery capability during primary WAN transport outages or device hangs. Which of the following implementations should be included to satisfy these out-of-band management objectives? (Select TWO.)

  1. Connect the serial console ports of critical routers and switches to a dedicated console server equipped with a cellular modem.Answer
  2. B
    Configure interactive command-line SSH management sessions to communicate over UDP instead of TCP across the remote access connection.
  3. Deploy a remote switched Power Distribution Unit (PDU) to allow administrators to power-cycle unresponsive network hardware remotely.Answer
  4. D
    Establish Telnet access on standard port 22 across the public internet as the primary fallback protocol during outages.

Answer

The out-of-band management solution requires connecting serial console ports to a cellular-enabled console server and deploying a switched PDU for remote hardware power cycling.
Out-of-band management requires access pathways completely decoupled from the primary network payload path. Connecting network device console ports to a cellular terminal server provides dedicated CLI control during WAN outages. Additionally, installing a switched Power Distribution Unit allows administrators to perform remote power restarts on non-responsive hardware.

Step-by-Step Solution

1
Identify the primary requirement for out-of-band management access during network transport outages.
Recognize that access must pass through a separate physical or wireless medium, such as a cellular modem connected to a serial console server.
In-band administrative channels depend on working network routing and WAN links, whereas out-of-band cellular access remains operational independently.
2
Identify the recovery mechanism for non-responsive network appliances that cannot process CLI commands.
Select a remotely managed, switched Power Distribution Unit (PDU).
Switched PDUs enable administrators to perform hard power reboots on specific outlets over the out-of-band link when devices experience kernel panics or lockups.
3
Evaluate transport layer protocols and port security standards for remote management.
Confirm SSH over TCP port 22 is used for secure shell access, while avoiding unencrypted Telnet (port 23) and incorrect UDP transport assignments.
SSH relies on TCP for reliable connection-oriented delivery, while Telnet on port 23 lacks payload encryption.

Key Concept

Out-of-band (OOB) management provides dedicated hardware mechanisms (serial console servers, cellular modems, switched PDUs) to manage and recover infrastructure independently of the primary production IP network.
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Topics

Remote Access and Out-of-Band Management

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