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Difficulty: HardRemote Access and Out-of-Band Management

A network engineer is designing an out-of-band (OOB) management solution for a remote datacenter rack to maintain administrative control during a complete primary network failure. The technical specifications mandate: (1) remote GUI-level visual access to bare-metal server console screens during POST/boot, (2) direct serial CLI management of edge routers and switches, and (3) the capability to remotely power-cycle frozen hardware. Which deployment strategy fulfills all of these requirements while maintaining dedicated OOB access?

  1. Deploy an IP-KVM switch for server console access, a serial console terminal server for network device CLI access, and a smart switched PDU for power cycling, all connected through an auxiliary cellular modem connection.Answer
  2. B
    Configure SNMPv2c across all switches and servers using UDP port 161 traps delivered over an dedicated in-band management VLAN to monitor system metrics and trigger remote reboots.
  3. C
    Enable unencrypted Telnet on TCP port 23 across network switches and RDP on TCP port 3389 across bare-metal servers, routed over the primary corporate WAN gateway.
  4. D
    Deploy TFTP using UDP port 69 over the primary interface to broadcast automated recovery files and execute remote OS reboots.

Answer

Deploy an IP-KVM switch for server console access, a serial console terminal server for network device CLI access, and a smart switched PDU for power cycling, all connected through an auxiliary cellular modem connection.
The combination of an IP-KVM, serial terminal server, smart switched PDU, and cellular modem provides complete out-of-band (OOB) administrative coverage. IP-KVM captures server video signals before the OS loads, the terminal server provides RS-232 serial console access to routers and switches, the switched PDU allows power cycling of locked devices, and the cellular modem ensures connectivity completely independent of primary network links.

Step-by-Step Solution

1
Analyze the management access requirements during primary network loss.
Identified three required functions: BIOS/POST GUI server access, router/switch serial CLI access, and remote hard power control, reachable via an independent network path.
In-band solutions (VLANs, primary WAN gateways) become unreachable during a primary network failure.
2
Map hardware appliances to specific out-of-band administration requirements.
IP-KVM satisfies server screen/GUI access; terminal server connects to device serial console ports; switched PDU provides power control per outlet.
Each dedicated device handles a distinct hardware management layer without relying on host operating systems.
3
Evaluate the transmission pathway for out-of-band reachability.
An auxiliary cellular modem provides independent internet access separate from primary fiber/ethernet ISPs.
Out-of-band management requires physical or logical path isolation from the main production data path.

Key Concept

Out-of-Band (OOB) Remote Management Architecture
Estimated Time:2m 0s
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Topics

Remote Access and Out-of-Band Management

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