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

A principal network architect is designing a high-availability out-of-band (OOB) management framework for a remote enterprise data center. The solution must guarantee secure administrative access to core network appliances and power controls even during a complete collapse of the primary WAN infrastructure and internal LAN control planes. Which TWO of the following deployment strategies directly satisfy these out-of-band access and security requirements? (Select TWO.)

  1. Deploy an encrypted cellular modem connected to a centralized serial console server that interfaces directly with the console ports of network appliances.Answer
  2. Utilize remote-managed Power Distribution Units (PDUs) reachable via an isolated OOB management network segment to perform hardware power cycling.Answer
  3. C
    Configure Telnet daemons on primary core switch interfaces to provide low-overhead command-line fallback access across the main network.
  4. D
    Deploy SNMPv2c agents across production VLANs to report link status and push configuration changes using standard community strings.

Answer

The correct strategies are deploying an encrypted cellular modem connected to a serial console server for terminal console access, and using remote-managed PDUs on an isolated OOB network segment for power management.
True out-of-band (OOB) management requires complete architectural isolation from production network channels. Connecting a central serial console server to appliance serial console ports via an encrypted cellular modem ensures administrators retain direct shell access during total WAN/LAN failures. Complementing this with intelligent PDUs on an isolated management network enables power-cycling frozen hardware remotely.

Step-by-Step Solution

1
Analyze the operational constraints of out-of-band management during primary network failures.
OOB management infrastructure must remain operational over alternative mediums (such as cellular or dedicated dial-up) when primary WAN routers and LAN switches fail.
In-band mechanisms depend on active data plane routing and switching, rendering them unavailable during major infrastructure outages.
2
Select components that provide direct device control and power management without relying on local network stacks.
Serial console servers provide low-level terminal access via RS-232 serial links, while remote smart PDUs allow cold-rebooting frozen devices.
Serial console access bypasses standard IP networking stacks on target appliances, and remote PDUs solve kernel hang scenarios.

Key Concept

Out-of-band (OOB) management architectures separate administrative control channels from production data networks using independent physical paths, secure serial console servers, and remote PDU power management.
Estimated Time:3m 0s
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Topics

Remote Access and Out-of-Band Management

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