[Solved] A user runs ifconfig eth0 up but the interface remains down. What could be the problem? — Ans: User lacks root privileges to bring interface up | Linux CLI

Linux CLI - Networking Commands

A user runs ifconfig eth0 up but the interface remains down. What could be the problem?

AThe network cable is unplugged

BThe interface eth0 does not exist

CUser lacks root privileges to bring interface up

DThe ifconfig command is deprecated and won't work

Step-by-Step Solution

Solution:

Step 1: Understand permissions for interface control
Bringing interfaces up requires root privileges; without them, command fails silently or errors.
Step 2: Evaluate other options
Interface missing would cause error; ifconfig still works for up/down; unplugged cable doesn't prevent interface UP state.
Final Answer:
User lacks root privileges to bring interface up -> Option C
Quick Check:
Root needed to change interface state [OK]

Quick Trick: Use sudo to bring interfaces up or down [OK]

Common Mistakes:

Master "Networking Commands" in Linux CLI

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A user runs ifconfig eth0 up but the interface remains down. What could be the problem?