The correct strategy is to provide clear instructions in the system prompt to answer only based on the provided context. This works because hallucinations in RAG architectures often stem from the LLM relying on its internal parametric knowledge rather than the retrieved documents; a well-crafted system prompt acts as a behavioral guardrail, explicitly constraining the model to ground its responses solely in the supplied context. On the Oracle Cloud Infrastructure Generative AI Professional 1Z0-1127 exam, this concept tests your understanding of prompt engineering as a critical lever for reducing hallucinations in RAG, with common traps including increasing temperature (which boosts randomness) or adding more chunks (which can introduce noise). A useful memory tip is “Context is king, prompt is the key”—the system prompt is your primary tool to lock the model onto the retrieved evidence.
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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An enterprise is using OCI Generative AI with a RAG architecture. They observe that the LLM sometimes produces hallucinated answers that are not supported by the retrieved documents. Which strategy is most effective in reducing these hallucinations?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provide clear instructions in the system prompt to answer only based on the provided context.
Option D is correct because instructing the LLM to only answer based on context reduces hallucinations. Option A is wrong because increasing temperature increases randomness, worsening hallucinations. Option B is wrong because adding more retrieved chunks may introduce conflicting information. Option C is wrong because using a smaller model may increase hallucination.
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.
✗
Increase the temperature parameter to make outputs more focused.
Why it's wrong here
Higher temperature increases randomness, likely producing more hallucinations.
✓
Provide clear instructions in the system prompt to answer only based on the provided context.
Why this is correct
Explicit grounding instructions guide the model to stick to retrieved documents, reducing unsupported claims.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a smaller LLM to reduce model capacity.
Why it's wrong here
Smaller models are more prone to hallucination, not less.
✗
Retrieve more chunks (increase top-k) to provide more context.
Why it's wrong here
More chunks can include irrelevant or contradictory information, potentially increasing hallucinations.
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: Provide clear instructions in the system prompt to answer only based on the provided context. — Option D is correct because instructing the LLM to only answer based on context reduces hallucinations. Option A is wrong because increasing temperature increases randomness, worsening hallucinations. Option B is wrong because adding more retrieved chunks may introduce conflicting information. Option C is wrong because using a smaller model may increase hallucination.
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.
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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