The answer is that the parsingMode is set to 'json' instead of 'default' or 'text'. This is the most likely cause because Azure AI Search uses the parsingMode parameter to determine how to interpret the content of indexed documents; when set to 'json', the indexer expects structured JSON files and will silently skip text extraction from binary formats like PDFs, producing no errors and no output. On the AI-102 exam, this scenario tests your understanding of indexer configuration for blob storage, where a common trap is assuming that a lack of errors means the configuration is correct—the indexer runs successfully but simply finds no text to extract. A reliable memory tip is to think of parsingMode as the "file format interpreter": use 'default' for most documents including PDFs, 'text' for plain text, and 'json' only when your blobs are actual JSON files.
AI-102 Practice Question: Implement knowledge mining and information extraction solutions
This AI-102 practice question tests your understanding of implement knowledge mining and information extraction solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 have an Azure AI Search indexer that is configured to index PDF files from Azure Blob Storage. The indexer is not extracting any text from the PDFs, and no errors are reported. You review the indexer definition as shown. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The parsingMode is set to 'json' instead of 'default' or 'text'
Option B is correct because the parsingMode is set to 'json', which is for JSON files, not PDFs. For PDF parsing, the mode should be 'default' or 'text'. Option A is wrong because contentAndMetadata is fine. Option C is wrong because field mappings are correct. Option D is wrong because the path mapping is fine.
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.
✓
The parsingMode is set to 'json' instead of 'default' or 'text'
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The field mapping from 'content' to 'content' is redundant and causes a conflict
Why it's wrong here
It is valid.
✗
The field mapping for 'metadata_storage_path' should be to 'metadata_storage_path'
Why it's wrong here
Mapping to 'path' is valid.
✗
The dataToExtract is set to 'contentAndMetadata' which is not supported for PDFs
Why it's wrong here
It is supported.
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.
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 AI-102 NAT questions on configuration and troubleshooting.
Implement knowledge mining and information extraction solutions — This question tests Implement knowledge mining and information extraction solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The parsingMode is set to 'json' instead of 'default' or 'text' — Option B is correct because the parsingMode is set to 'json', which is for JSON files, not PDFs. For PDF parsing, the mode should be 'default' or 'text'. Option A is wrong because contentAndMetadata is fine. Option C is wrong because field mappings are correct. Option D is wrong because the path mapping is fine.
What should I do if I get this AI-102 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 AI-102 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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