The answer is to use a combination of ping sweep with fping followed by nmap -sS (SYN scan) on discovered hosts. This approach is correct because it first reduces the scan scope by quickly identifying live hosts with a low-overhead ping sweep, then applies a stealthy SYN scan—also known as a half-open scan—to probe only those active targets for open ports, thereby minimizing network disruption and avoiding IDS detection. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to balance speed, stealth, and accuracy during internal network reconnaissance; a common trap is choosing masscan for its raw speed, but its aggressive packet rate often triggers alerts, while a full connect scan (-sT) is too noisy and leaves logged connections. Remember the memory tip: “Ping to find, SYN to bind”—first sweep for life, then half-open for ports.
PT0-002 Tools and Code Analysis Practice Question
This PT0-002 practice question tests your understanding of tools and code analysis. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is performing an internal network assessment and needs to quickly identify all live hosts and their open ports across a large subnet (10.0.0.0/16). The tester wants to minimize network disruption and avoid IDS detection. Which tool and technique should the tester use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a combination of ping sweep with fping followed by nmap -sS (SYN scan) on discovered hosts
Option B is correct because it reduces the scan scope with a ping sweep, then uses a stealthy SYN scan to identify open ports, minimizing traffic and detection risk. Option A scans all ports with connect scan which is noisy. Option C is extremely slow and inefficient. Option D masscan is fast but less stealthy and may still trigger alerts.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use nmap with -sT (TCP connect scan) and -p- (all ports) on the entire subnet
Why it's wrong here
This is too noisy and slow, and likely to be detected by IDS.
✗
Use masscan with a low rate (--rate=100) to scan all ports on all IPs
Why it's wrong here
Masscan is fast but its pattern can be detected by IDS, even at low rates.
✓
Use a combination of ping sweep with fping followed by nmap -sS (SYN scan) on discovered hosts
Why this is correct
Reduces scope and uses stealthy SYN scan, minimizing detection.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Use netcat to perform a sequential port scan on each IP in the subnet
Why it's wrong here
Extremely slow and inefficient for a large subnet.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PT0-002 subnetting questions on CIDR, address ranges, and subnet selection.
Tools and Code Analysis — This question tests Tools and Code Analysis — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use a combination of ping sweep with fping followed by nmap -sS (SYN scan) on discovered hosts — Option B is correct because it reduces the scan scope with a ping sweep, then uses a stealthy SYN scan to identify open ports, minimizing traffic and detection risk. Option A scans all ports with connect scan which is noisy. Option C is extremely slow and inefficient. Option D masscan is fast but less stealthy and may still trigger alerts.
What should I do if I get this PT0-002 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PT0-002 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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