XK0-006 Troubleshooting Practice Question
A Linux administrator needs to verify which network interfaces are up and their IP addresses on a server. Which command provides this information?
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 addr
The `ip addr` command displays all network interfaces along with their IP addresses, MAC addresses, and status (UP/DOWN).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ss -tlnp
Why it's wrong here
ss -tlnp lists listening TCP sockets with owning processes, not interface operational state or assigned IP addresses; ip addr show provides that. It tempts because ss is a legitimate network diagnostic tool, and it would be correct for identifying which ports services are listening on.
- ✗
nmcli dev show
Why it's wrong here
While `nmcli dev show` does display network device information, its output is excessively verbose and detailed, including a comprehensive list of all device parameters and their current states, rather than a concise summary of active interfaces and their IP addresses. It is tempting because it *does* show network device status, and would be the correct choice if the administrator needed to diagnose intricate network configuration issues or inspect specific driver details.
- ✗
ifconfig -a
Why it's wrong here
ifconfig -a lists all interfaces including those administratively down, so it does not isolate interfaces that are up; ip addr show or ip link show reports operational state and addresses. It tempts because ifconfig is the classic interface-inspection tool, and it would suffice if the task were simply listing every interface's configuration.
- ✓
ip addr
Why this is correct
The ip addr command reads interface state and assigned addresses directly from the kernel, listing every interface with its UP/DOWN flag and IPv4/IPv6 addresses. It satisfies the requirement to verify which interfaces are up and their IPs.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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