The answer is that a firewall is likely blocking access to port 8080, as the filtered status in Nmap directly indicates that a firewall, ACL, or network filter is preventing probes from reaching the port. When Nmap reports a port as filtered, it means the scanner cannot determine whether the port is open or closed because packets are being dropped or rejected by an intermediary device, making this the most accurate conclusion for the target host. On the CompTIA PenTest+ PT0-002 exam, interpreting Nmap filtered port status tests your ability to distinguish between port states and infer network defenses, with a common trap being to assume filtered means the port is closed or that a service is simply not responding. Remember the memory tip: filtered equals firewall—if you see filtered, think of a filter blocking the path, not a service that is absent or unknown.
PT0-002 Practice Question: Information Gathering and Vulnerability Scanning
This PT0-002 practice question tests your understanding of information gathering and vulnerability scanning. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Network Topology
Based on the Nmap output above, which of the following conclusions is MOST accurate regarding the target host?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A firewall is likely blocking access to port 8080.
Option B is correct because 'filtered' indicates a firewall or ACL is blocking access to port 8080. Option A is wrong because filtered means state unknown; Option C is wrong because SSH is on standard port 22; Option D is not definitive from this scan alone.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The host is running Linux because SSH is open.
Why it's wrong here
SSH is not exclusive to Linux; other systems can run SSH.
✗
The host is running a web server on port 8080.
Why it's wrong here
Filtered means Nmap cannot determine if the service is running.
✗
The SSH service is configured to use a non-standard port.
A firewall is likely blocking access to port 8080.
Why this is correct
Filtered state typically results from a firewall dropping packets.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PT0-002 ACL questions on filtering logic and placement.
Information Gathering and Vulnerability Scanning — This question tests Information Gathering and Vulnerability Scanning — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: A firewall is likely blocking access to port 8080. — Option B is correct because 'filtered' indicates a firewall or ACL is blocking access to port 8080. Option A is wrong because filtered means state unknown; Option C is wrong because SSH is on standard port 22; Option D is not definitive from this scan alone.
What should I do if I get this PT0-002 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PT0-002 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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