This PT0-002 practice question tests your understanding of planning and scoping. 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.
During scoping, a tester learns that the client's network has multiple subsidiaries with different IP ranges. The client wants a test that covers all subsidiaries but with a limited number of target IPs. How should the tester proceed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Select a representative sample of IPs from each subsidiary
Selecting a representative sample of IPs from each subsidiary allows coverage across all subsidiaries while respecting the target limit. Testing only headquarters ignores subsidiaries, and combining ranges may produce too many targets. Asking for a larger budget may not be an option.
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.
✗
Ask for a larger budget
Why it's wrong here
This does not solve the immediate scoping constraint.
✓
Select a representative sample of IPs from each subsidiary
Why this is correct
Sampling provides coverage across the entire organization within limits.
Test only the corporate headquarters and ignore subsidiaries
Why it's wrong here
This does not meet the client's requirement to cover all subsidiaries.
✗
Use a subnet calculator to combine all ranges
Why it's wrong here
Combining ranges may still exceed the limit or not accurately represent each subsidiary.
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 analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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.
Planning and Scoping — This question tests Planning and Scoping — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Select a representative sample of IPs from each subsidiary — Selecting a representative sample of IPs from each subsidiary allows coverage across all subsidiaries while respecting the target limit. Testing only headquarters ignores subsidiaries, and combining ranges may produce too many targets. Asking for a larger budget may not be an option.
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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