XK0-006 Troubleshooting Practice Question
After modifying the network configuration on a RHEL 8 system, the administrator wants to bring up the interface without rebooting. Which command sequence should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
nmcli con up eth0
nmcli con up ifcfg-eth0 activates the connection. If using legacy scripts, ifup eth0 would work, but nmcli is the modern method for NetworkManager.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ip link set eth0 up
Why it's wrong here
ip link set up only brings the link up but does not apply NetworkManager connection settings.
- ✗
systemctl restart network && nmcli dev connect eth0
Why it's wrong here
systemctl restart network is legacy; nmcli dev connect is not a valid command.
- ✓
nmcli con up eth0
Why this is correct
nmcli con up brings up the connection associated with the interface.
- ✗
ifconfig eth0 up
Why it's wrong here
ifconfig is deprecated and also does not apply NetworkManager settings.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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