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Question

Difficulty: MediumRemote Access and Out-of-Band Management

Match each remote access technology or management tool on the left with the operational scenario on the right for which it serves as the most appropriate solution.

  • Direct Serial Console Cable (Rollover)Performing initial out-of-the-box CLI configuration on a new switch with no active IP address
  • Switched Power Distribution Unit (PDU)Performing a hard power cycle on a frozen network appliance remotely
  • Cellular-enabled Terminal ServerAccessing CLI management ports on edge network switches at an unstaffed site during a primary WAN link failure
  • VNC over SSH TunnelAccessing a remote graphical desktop session securely across an untrusted network connection

Answer

Direct Serial Console Cable matches initial CLI configuration on unconfigured devices. Switched PDU matches hard power cycling frozen appliances. Cellular-enabled Terminal Server matches remote CLI console access during primary WAN link failure. VNC over SSH Tunnel matches secure remote graphical desktop access.
Each management solution directly aligns with the operational constraints: Direct serial console works on unconfigured devices with no IP address; switched PDUs control power outlets for frozen hardware; cellular terminal servers provide an independent wireless OOB path during primary link outages; and VNC tunneled over SSH provides secure encrypted remote GUI access.

Step-by-Step Solution

1
Analyze the management requirements for unconfigured network devices.
Unconfigured devices lack IP addresses, requiring direct physical serial console connectivity.
Serial connections bypass lower-layer networking requirements.
2
Evaluate hardware control options for unresponsive devices.
Devices with locked operating systems require physical electrical power control provided by switched PDUs.
In-band or serial management commands cannot execute if the host operating system is frozen.
3
Identify backup out-of-band communication paths for branch sites.
Cellular terminal servers aggregate console ports and route management traffic over cellular networks when primary landline WAN links drop.
Maintains out-of-band management independent of primary transport infrastructure.
4
Determine secure graphical remote desktop access protocols.
Encapsulating unencrypted VNC traffic inside an encrypted SSH tunnel secures desktop graphical sessions over untrusted networks.
Combines VNC graphical interface functionality with SSH security.

Key Concept

Selecting appropriate in-band, out-of-band, physical, and remote management technologies based on network health, device status, and security constraints.
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Topics

Remote Access and Out-of-Band Management

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