The answer is probabilistic record linkage using name, DOB, and ZIP. This technique is the correct choice because it uses multiple non-unique attributes—such as name, date of birth, and ZIP code—to calculate a probability that two records refer to the same entity, even when no common identifier exists across systems. On the CompTIA Data+ DA0-001 exam, this scenario tests your understanding of data integration and deduplication methods, often appearing in questions about merging healthcare or customer data from disparate sources. A common trap is selecting manual matching, which is not scalable for large datasets, or assuming random IDs can preserve relationships. The key memory tip: think “fuzzy match with weights” for probabilistic linkage—it scores similarity across fields rather than requiring exact matches, making it ideal for real-world data where identifiers are inconsistent or missing.
DA0-001 Mining and Acquiring Data Practice Question
This DA0-001 practice question tests your understanding of mining and acquiring data. 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.
A healthcare organization acquires data from multiple hospitals with different patient record systems. The data includes patient IDs but no common identifier across systems. Which technique should be used to link records?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Probabilistic record linkage using name, DOB, and ZIP
Option D (probabilistic linkage) is designed for such situations. Option A (random IDs) loses connections. Option B (merge without dedup) creates duplicates. Option C (manual matching) is not scalable.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Merge all records without deduplication
Why it's wrong here
Merging without dedup creates duplicate patient records.
✗
Generate random unique IDs for each system
Why it's wrong here
Random IDs do not help link records across systems.
✗
Manually match records for all patients
Why it's wrong here
Manual matching is impractical for large datasets.
✓
Probabilistic record linkage using name, DOB, and ZIP
Why this is correct
Probabilistic linkage uses multiple attributes to find matches with high confidence.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DA0-001 NAT questions on configuration and troubleshooting.
Mining and Acquiring Data — This question tests Mining and Acquiring Data — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Probabilistic record linkage using name, DOB, and ZIP — Option D (probabilistic linkage) is designed for such situations. Option A (random IDs) loses connections. Option B (merge without dedup) creates duplicates. Option C (manual matching) is not scalable.
What should I do if I get this DA0-001 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DA0-001 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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