The answer is `ss -tlnp`. This command is the correct choice because it leverages the `netlink` interface to read socket information directly from the kernel, making it the modern, built-in replacement for `netstat` on distributions like RHEL 7+ and Ubuntu 16.04+ that have deprecated the older tool. For the CompTIA PenTest+ PT0-002 exam, this tests your ability to perform local reconnaissance from a low-privileged shell, where you must quickly identify listening services without root privileges or a full port scan. A common trap is assuming `netstat` is always available, but many modern systems ship only `ss`; the `-tlnp` flags specifically filter for TCP, listening, numeric output, and associated processes. Remember the mnemonic: "TCP Listening? No Problem" for `-t`, `-l`, `-n`, `-p`.
PT0-002 Tools and Code Analysis Practice Question
This PT0-002 practice question tests your understanding of tools and code analysis. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 penetration tester wants to quickly identify the listening services on a target Linux server without performing a full port scan. The tester has obtained an unauthenticated shell as a low-privileged user. Which built-in command is most likely available on a modern Linux distribution to list all listening TCP sockets?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 `ss -tlnp` is the modern replacement for `netstat` on Linux distributions that have deprecated `netstat` (e.g., RHEL 7+, Ubuntu 16.04+). It uses the `netlink` interface to read socket information directly from the kernel, making it faster and more reliable than parsing `/proc/net/tcp`. The flags `-t` (TCP), `-l` (listening), `-n` (numeric addresses/ports), and `-p` (show process) precisely list all listening TCP sockets without requiring root privileges for basic socket listing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
netstat -tlnp
Why it's wrong here
netstat is not always installed by default on modern distributions, and the -p flag may require root to show process names.
✓
ss -tlnp
Why this is correct
ss is part of iproute2 and is commonly pre-installed; -t shows TCP, -l listening, -n numeric, -p shows process (if permitted).
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
lsof -i
Why it's wrong here
lsof may require root to list all processes, and it is not specifically designed for listening sockets only.
✗
ifconfig -a
Why it's wrong here
ifconfig displays network interface configuration, not socket information.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `netstat` is universally available on Linux, but the PT0-002 exam tests awareness of modern tooling deprecation, where `ss` is the default built-in command on distributions like CentOS 7+ and Ubuntu 16.04+.
Trap categories for this question
Command / output trap
netstat is not always installed by default on modern distributions, and the -p flag may require root to show process names.
Detailed technical explanation
How to think about this question
The `ss` command reads socket information from the kernel's `netlink` socket (`NETLINK_SOCK_DIAG`), which provides a direct and efficient interface for querying socket states, unlike `netstat` which parses the `/proc/net/tcp` file system. In a real-world penetration test, a low-privileged user can still use `ss -tlnp` to see listening services and their associated PIDs, which is critical for identifying vulnerable services without triggering network-based detection. Note that the `-p` flag may require `CAP_NET_ADMIN` or root on some hardened systems, but on standard distributions it works for the user's own processes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Tools and Code Analysis — This question tests Tools and Code Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ss -tlnp — Option B is correct because `ss -tlnp` is the modern replacement for `netstat` on Linux distributions that have deprecated `netstat` (e.g., RHEL 7+, Ubuntu 16.04+). It uses the `netlink` interface to read socket information directly from the kernel, making it faster and more reliable than parsing `/proc/net/tcp`. The flags `-t` (TCP), `-l` (listening), `-n` (numeric addresses/ports), and `-p` (show process) precisely list all listening TCP sockets without requiring root privileges for basic socket listing.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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