XK0-006 Troubleshooting Practice Question
A Linux administrator is troubleshooting a server that has lost network connectivity. The administrator runs `ip a` and sees that the interface `ens33` is in the DOWN state and has no IP address assigned. The administrator wants to bring the interface up and assign it an IP address of 192.168.1.50/24. Which command should the administrator use?
⚠ Common exam trap
The trap here is thinking that assigning an IP address automatically brings the interface up; in reality, the link state must be set to UP separately.
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
✓
ip link set ens33 up && ip addr add 192.168.1.50/24 dev ens33
To restore connectivity, the administrator must both bring the interface up and assign an IP address. The `ip link set ens33 up` command changes the administrative state to UP, and `ip addr add` assigns the address. Combining them ensures the interface is operational with the correct IP, which is the most direct solution.
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 addr add 192.168.1.50/24 dev ens33
Why it's wrong here
This command assigns an IP address to the interface but does not bring the interface up. If the interface is DOWN, adding an IP address alone will not make it operational. The administrator must also set the link state to UP, typically with `ip link set ens33 up`, before or after assigning the address.
- ✗
ifconfig ens33 192.168.1.50 netmask 255.255.255.0 up
Why it's wrong here
While `ifconfig` can assign an IP and bring the interface up, it is deprecated in modern Linux distributions in favor of the `ip` command. The scenario does not specify that legacy tools are required. Moreover, the `ip` command is the current standard and is preferred for consistency and future-proofing.
- ✓
ip link set ens33 up && ip addr add 192.168.1.50/24 dev ens33
Why this is correct
This command sequence first brings the interface `ens33` up using `ip link set ens33 up`, then assigns the IP address with `ip addr add`. This is the correct approach because the interface must be administratively up to pass traffic. The `&&` ensures the second command runs only if the first succeeds, which is good practice.
- ✗
ip route add 192.168.1.0/24 dev ens33
Why it's wrong here
This command adds a route to the network 192.168.1.0/24 via the interface `ens33`, but it does not assign an IP address to the interface nor bring it up. Without an IP address on the interface, the route is useless. The administrator needs to configure the interface itself first.
Quick reference
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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