- A
The ElastiCache cache is returning stale cached responses that contain the old information.
Correct. The cache is not invalidated on document updates, so identical queries return cached old responses.
- B
The 'maximum results' parameter in the RetrieveAndGenerate API is set to a value too low to retrieve the new chunks.
Why wrong: Plausible but unlikely because the sync succeeded and the index contains new chunks; low max results could still retrieve new chunks if they are relevant.
- C
The embedding model used by the knowledge base has not been retrained on the new documentation.
Why wrong: Incorrect. Embedding models are pre-trained and not retrained per sync; new chunks are embedded using the same model.
- D
The IAM role for the Lambda function lacks permissions to access the new S3 objects.
Why wrong: Incorrect. If permissions were lacking, the data source sync would have failed.
Quick Answer
The answer is the ElastiCache cache returning stale cached responses that contain the old information. This is the most likely cause because the Lambda function caches responses keyed by user query with a 24-hour TTL, and no cache invalidation occurs after documentation updates. Even though the Bedrock knowledge base sync completed and new chunks exist in the OpenSearch index, the RetrieveAndGenerate API call hits the cached response from Redis before reaching the updated vector store, serving outdated data. On the AWS Certified AI Practitioner AIF-C01 exam, this scenario tests your understanding of how caching layers can bypass retrieval in a chatbot architecture—a common trap where learners focus only on the knowledge base sync or vector store health. Remember the memory tip: "Cache before context" means stale cache will always override fresh retrieval if invalidation is missing.
AIF-C01 Fundamentals of Generative AI Practice Question
This AIF-C01 practice question tests your understanding of fundamentals of generative ai. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 operates a customer support chatbot that uses Amazon Bedrock with a knowledge base sourced from an S3 bucket containing frequently updated product documentation. The knowledge base uses OpenSearch Serverless as the vector store and is configured to sync daily. The chatbot uses the RetrieveAndGenerate API with a custom Lambda function that applies a system prompt instructing the model to base answers solely on the retrieved context. After a major update to the product documentation, the IT team verifies that the data source sync completed successfully and the new chunks are present in the OpenSearch index. However, the chatbot continues to respond with outdated information. Further investigation reveals that the Lambda function includes a response caching mechanism using Amazon ElastiCache for Redis with a Time-To-Live (TTL) of 24 hours. The cache key is based on the user query. The team notes that no cache invalidation is performed after documentation updates. What is the most likely cause of the outdated responses?
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The ElastiCache cache is returning stale cached responses that contain the old information.
Since the data source sync succeeded and the index contains new chunks, the retrieval should be able to access the latest data. However, the Lambda function caches responses keyed by query. With a 24-hour TTL and no invalidation, the cache returns stale responses containing the old safety information. Clearing the cache or reducing TTL would resolve the issue. The other options are less likely: low max results might cause missing new chunks but would not consistently return old info; the embedding model is not retrained per sync; IAM permissions would affect sync, not retrieval.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 ElastiCache cache is returning stale cached responses that contain the old information.
Why this is correct
Correct. The cache is not invalidated on document updates, so identical queries return cached old responses.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'maximum results' parameter in the RetrieveAndGenerate API is set to a value too low to retrieve the new chunks.
Why it's wrong here
Plausible but unlikely because the sync succeeded and the index contains new chunks; low max results could still retrieve new chunks if they are relevant.
- ✗
The embedding model used by the knowledge base has not been retrained on the new documentation.
Why it's wrong here
Incorrect. Embedding models are pre-trained and not retrained per sync; new chunks are embedded using the same model.
- ✗
The IAM role for the Lambda function lacks permissions to access the new S3 objects.
Why it's wrong here
Incorrect. If permissions were lacking, the data source sync would have failed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which AIF-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Fundamentals of Generative AI — study guide chapter
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FAQ
Questions learners often ask
What does this AIF-C01 question test?
Fundamentals of Generative AI — This question tests Fundamentals of Generative AI — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ElastiCache cache is returning stale cached responses that contain the old information. — Since the data source sync succeeded and the index contains new chunks, the retrieval should be able to access the latest data. However, the Lambda function caches responses keyed by query. With a 24-hour TTL and no invalidation, the cache returns stale responses containing the old safety information. Clearing the cache or reducing TTL would resolve the issue. The other options are less likely: low max results might cause missing new chunks but would not consistently return old info; the embedding model is not retrained per sync; IAM permissions would affect sync, not retrieval.
What should I do if I get this AIF-C01 question wrong?
Identify which AIF-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 23, 2026
This AIF-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AIF-C01 exam.
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