XK0-006 Troubleshooting Practice Question
A Linux administrator wants to view all listening TCP ports and the associated processes on a system. Which command should be used?
⚠ Common exam trap
A common mix-up: candidates choose `netstat -tulpn` (Option B) because it is historically familiar, but the XK0-005 exam emphasizes modern tools like `ss` over deprecated commands.
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
The `ss -tlnp` command is correct because it displays all TCP listening sockets (`-t` for TCP, `-l` for listening) with numeric addresses (`-n`) and shows the associated process information (`-p`). This is the modern replacement for `netstat` and is the recommended tool on current Linux distributions for socket statistics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
lsof -i TCP
Why it's wrong here
lsof can show listening ports but requires filtering; ss is more direct.
- ✗
netstat -tulpn
Why it's wrong here
netstat is deprecated; ss is the modern replacement.
- ✓
ss -tlnp
Why this is correct
Correct command.
- ✗
nmap -sT localhost
Why it's wrong here
nmap scans ports but is not the standard tool for local listening ports.
Go deeper
Related to this question
Learn chapter
Linux Fundamentals and History
Key term
Process
In IT service management, a process is a structured set of activities designed to accomplish a specific objective, such as managing incidents or changes, by transforming inputs into defined outputs.
Key term
Linux
Linux is an open-source operating system that manages computer hardware and software, widely used in servers, desktops, and embedded systems.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.