This DP-203 practice question tests your understanding of develop data processing. 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.
Refer to the exhibit. You have an Azure Data Factory pipeline that copies data from Azure Blob Storage to Azure SQL Database. The copy activity uses a preCopyScript to truncate the destination table before writing. During a recent run, the copy activity failed after the truncation, leaving the destination table empty. You need to prevent data loss in future failures. What should you modify?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a staging table and then a stored procedure to swap tables.
Option C is correct because using a staging table prevents data loss: copy to staging, then swap. Option A is wrong because the fault tolerance setting only handles errors but does not roll back truncation. Option B is wrong because turning off truncation would not ensure atomicity. Option D is wrong because retry would re-execute truncation and fail again.
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.
✗
Add a retry policy to the copy activity.
Why it's wrong here
Retry would re-execute the preCopyScript, truncating again.
✗
Enable fault tolerance in the copy activity source.
Why it's wrong here
Fault tolerance skips erroneous rows but does not undo truncation.
✓
Use a staging table and then a stored procedure to swap tables.
Why this is correct
Staging table ensures atomicity: copy to staging, then swap with destination.
Related concept
Static NAT maps one inside address to one outside address.
✗
Remove the preCopyScript and set writeBatchSize to 0.
Why it's wrong here
Removing truncation may cause duplicate data, not prevent loss.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
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 DP-203 NAT questions on configuration and troubleshooting.
Develop data processing — This question tests Develop data processing — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a staging table and then a stored procedure to swap tables. — Option C is correct because using a staging table prevents data loss: copy to staging, then swap. Option A is wrong because the fault tolerance setting only handles errors but does not roll back truncation. Option B is wrong because turning off truncation would not ensure atomicity. Option D is wrong because retry would re-execute truncation and fail again.
What should I do if I get this DP-203 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 DP-203 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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