This PDE practice question tests your understanding of ensuring solution quality. 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 company uses BigQuery for analytics. They need to ensure data quality by preventing duplicate records from being inserted. Which approach is most effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a DML MERGE statement that filters out duplicates based on a unique key.
Using MERGE with ROW_NUMBER() to identify and skip duplicates in a staging table before inserting into the final table is a common pattern for deduplication.
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.
✗
Use BigQuery ML to train a model that identifies anomalies.
Why it's wrong here
ML models are not designed for exact deduplication and add unnecessary complexity.
✓
Use a DML MERGE statement that filters out duplicates based on a unique key.
Why this is correct
MERGE with deduplication logic ensures only one copy of each record is inserted, maintaining data quality.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Cloud Data Loss Prevention API to scan for duplicates.
Why it's wrong here
DLP is for sensitive data detection, not deduplication.
✗
Use COUNT DISTINCT in queries to ignore duplicates.
Why it's wrong here
This masks duplicates but does not prevent them from being stored; it does not ensure data quality at rest.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 PDE NAT questions on configuration and troubleshooting.
Ensuring solution quality — This question tests Ensuring solution quality — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a DML MERGE statement that filters out duplicates based on a unique key. — Using MERGE with ROW_NUMBER() to identify and skip duplicates in a staging table before inserting into the final table is a common pattern for deduplication.
What should I do if I get this PDE 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 PDE 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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