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You run ip addr show eth0 but get an error 'Device not found'. What is the likely cause?

medium📝 Debug Q6 of 15
Linux CLI - Networking Commands
You run ip addr show eth0 but get an error 'Device not found'. What is the likely cause?
AYou need root privileges to run ip addr show
BThe interface eth0 does not exist on the system
CThe interface eth0 is down
DThe ip command is not installed
Step-by-Step Solution
Solution:

  1. Step 1: Analyze the error message

    'Device not found' means the interface name is invalid or missing.

  2. Step 2: Check other options

    Command missing would cause 'command not found', interface down still shows info, root not required for show.

  3. Final Answer:

    The interface eth0 does not exist on the system -> Option B

  4. Quick Check:

    Device not found = interface missing [OK]
Quick Trick: Device not found means interface name is wrong or missing [OK]
Common Mistakes:
  • Assuming interface down causes error
  • Thinking root needed to view interfaces
  • Confusing missing command with missing device

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