The correct answer is to add a reranking step after retrieval to select the most relevant chunks. This strategy directly addresses the root cause of hallucination in RAG—when the LLM receives irrelevant context, it fabricates plausible-sounding but incorrect information. Reranking works by taking the initial set of retrieved documents (even with a low topK of 3) and applying a more precise relevance model to reorder or filter them, ensuring only the most pertinent chunks reach the LLM. On the Oracle Cloud Infrastructure Generative AI Professional 1Z0-1127 exam, this concept tests your understanding of retrieval quality versus retrieval quantity; a common trap is assuming that increasing topK or reducing chunk size alone solves noise issues, but reranking is the targeted fix for ranking errors. Remember the mnemonic: “Retrieve, Rerank, then Reason”—without the middle step, the LLM is just guessing from a messy pile of papers.
1Z0-1127 Practice Question: Building LLM Applications with RAG and Vector Search
This 1Z0-1127 practice question tests your understanding of building llm applications with rag and vector search. 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 RAG application is hallucinating because the LLM receives irrelevant context from the retrieval step, even when topK is set to 3. Which strategy would best reduce hallucination by improving the relevance of retrieved documents?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a reranking step after retrieval to select the most relevant chunks
Adding a reranking step after initial retrieval can filter out irrelevant documents, improving the quality of context fed to the LLM. Increasing topK would add more noise. Using a smaller chunk size might help but not as targeted. Changing the query rewriting may not address the core issue of ranking.
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.
✗
Reduce the chunk size to one sentence per chunk
Why it's wrong here
May lose necessary context.
✓
Add a reranking step after retrieval to select the most relevant chunks
Why this is correct
Reranking improves the relevance of the final context set.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Implement a query rewriting mechanism
Why it's wrong here
Query rewriting may help but does not directly fix irrelevant retrieval.
✗
Increase topK to 10 to provide more context
Why it's wrong here
More context often includes more irrelevant information, potentially increasing hallucination.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 1Z0-1127 NAT questions on configuration and troubleshooting.
Building LLM Applications with RAG and Vector Search — This question tests Building LLM Applications with RAG and Vector Search — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Add a reranking step after retrieval to select the most relevant chunks — Adding a reranking step after initial retrieval can filter out irrelevant documents, improving the quality of context fed to the LLM. Increasing topK would add more noise. Using a smaller chunk size might help but not as targeted. Changing the query rewriting may not address the core issue of ranking.
What should I do if I get this 1Z0-1127 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 1Z0-1127 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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