The correct answer is to use a Copy activity with pagination rules enabled in the source. This is because Azure Data Factory’s Copy activity natively supports REST API pagination through configurable pagination rules, such as AbsoluteUrl or QueryParameters, which automatically loop through each page of 1000 records until all 50,000 records are fetched without requiring additional orchestration. On the DP-203 exam, this scenario tests your understanding of how ADF handles dynamic data retrieval from paginated APIs, often trapping candidates who mistakenly choose the Until or ForEach activity—but those are for custom looping logic, not for built-in pagination handling. A common memory tip is to remember that the Copy activity’s source settings include a dedicated “Pagination rules” section, making it the simplest and most efficient choice for REST API pagination in ADF.
DP-203 Develop data processing Practice Question
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.
You are building a data pipeline that uses Azure Data Factory to copy data from a REST API to Azure Blob Storage. The REST API returns JSON data in pages of 1000 records each. The total number of records is 50,000. Which activity or feature should you use to loop through the pages?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a Copy activity with pagination rules enabled in the source.
Option C is correct because the Until activity with a dynamic pagination logic is appropriate for looping until all pages are fetched. Option A is incorrect because the Copy activity alone does not handle pagination. Option B is incorrect because ForEach is for iterating a fixed set of items, not dynamic pagination. Option D is incorrect because Lookup activity returns a single value, not suitable for pagination.
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 a ForEach activity to iterate over a fixed number of pages.
Why it's wrong here
ForEach requires a fixed array; pagination is dynamic and unknown upfront.
✗
Use a Lookup activity to retrieve the total number of pages and then use a ForEach.
Why it's wrong here
This adds complexity; the Copy activity natively supports pagination.
✗
Use an Until activity to loop until the API returns no more pages.
Why it's wrong here
Until is used for conditional loops but not the most efficient; the Copy activity's built-in pagination is simpler.
✓
Use a Copy activity with pagination rules enabled in the source.
Why this is correct
The Copy activity supports pagination for REST APIs using pagination rules (e.g., next URL).
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 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 Copy activity with pagination rules enabled in the source. — Option C is correct because the Until activity with a dynamic pagination logic is appropriate for looping until all pages are fetched. Option A is incorrect because the Copy activity alone does not handle pagination. Option B is incorrect because ForEach is for iterating a fixed set of items, not dynamic pagination. Option D is incorrect because Lookup activity returns a single value, not suitable for pagination.
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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