XK0-006 Troubleshooting Practice Question
A system administrator notices that a web server is running but users cannot connect to port 443. Which ss command will show if the server is listening on that port?
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
✓
ss -tlnp
ss -tlnp shows listening TCP sockets with numeric ports and process info. -t for TCP, -l listening, -n numeric, -p process.
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 -s
Why it's wrong here
ss -s gives a summary, not per-port details.
- ✓
ss -tlnp
Why this is correct
Shows TCP listening sockets with process info.
- ✗
ss -tuln
Why it's wrong here
This shows listening UDP and TCP, but no process info.
- ✗
ss -tan
Why it's wrong here
Shows all TCP connections, not just listening.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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