XK0-006 Troubleshooting Practice Question
A Linux administrator needs to check which services are listening on TCP port 22. Which command 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
✓
ss -tlnp | grep :22
The 'ss -tlnp' command shows listening TCP sockets with process information, making it suitable for checking services on port 22.
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 | grep :22
Why this is correct
ss -tlnp shows listening TCP ports with process info; grep filters for port 22.
- ✗
ping -p 22 localhost
Why it's wrong here
ping does not show listening ports.
- ✗
ip addr show port 22
Why it's wrong here
ip addr shows IP addresses, not ports.
- ✗
traceroute -p 22 localhost
Why it's wrong here
traceroute is for path discovery, not port listening.
Go deeper
Related to this question
Learn chapter
Linux Fundamentals and History
Key term
Linux
Linux is an open-source operating system that manages computer hardware and software, widely used in servers, desktops, and embedded systems.
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.
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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.