This EX200 practice question tests your understanding of manage containers. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A container fails to start because the port it needs is already in use. Which command can the administrator use to identify the process using the port?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
podman logs <container>
Why wrong: Logs do not show port conflicts.
ss -tlnp
Correct. This displays listening ports and the associated process IDs.
podman port -l
Why wrong: This only shows port mappings for the most recent container.
firewall-cmd --list-ports
Why wrong: This lists firewall open ports, not running processes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ss -tlnp
Option B is correct because the `ss -tlnp` command displays listening TCP sockets (`-t`), numeric addresses (`-n`), and the associated process information (`-p`). This allows the administrator to identify which process (PID and program name) is bound to a specific port, directly addressing the container startup failure caused by a port conflict.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
podman logs <container>
Why it's wrong here
Logs do not show port conflicts.
ss -tlnp
Why this is correct
Correct. This displays listening ports and the associated process IDs.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
podman port -l
Why it's wrong here
This only shows port mappings for the most recent container.
firewall-cmd --list-ports
Why it's wrong here
This lists firewall open ports, not running processes.
Common exam traps
The trap here is that candidates often think `podman port -l` or `podman logs` can diagnose host-level port conflicts, but these commands only show container-specific information and cannot identify processes outside the container namespace.
Trap categories for this question
Command / output trap
Logs do not show port conflicts.
Detailed technical explanation
The `ss` command reads socket information from the kernel's netlink interface, providing detailed socket statistics including the inode and PID of the owning process. Unlike `netstat`, `ss` is more efficient and is the recommended tool on modern RHEL/CentOS systems. In a real-world scenario, a container might fail to start because a system service like `httpd` or `nginx` is already listening on port 80, and `ss -tlnp` would immediately reveal the conflicting PID and process name.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Manage containers — This question tests Manage containers — Read the scenario before looking for a memorised answer..
The correct answer is: ss -tlnp — Option B is correct because the `ss -tlnp` command displays listening TCP sockets (`-t`), numeric addresses (`-n`), and the associated process information (`-p`). This allows the administrator to identify which process (PID and program name) is bound to a specific port, directly addressing the container startup failure caused by a port conflict.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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