- A
Store vectors in-memory within the application server
Why wrong: In-memory storage is not durable and cannot scale for large datasets.
- B
Use OCI OpenSearch with a public endpoint for low latency
Why wrong: Public endpoints expose the vector store to the internet, compromising security.
- C
Use OCI OpenSearch with a private subnet and VCN security lists
Private subnet ensures network isolation, and security lists control access.
- D
Use a third-party vector database outside OCI
Why wrong: External databases introduce data egress and security compliance risks.
Question 887 of 991
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. 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.
A developer wants to build a RAG application that processes highly sensitive medical records. The documents are already stored in OCI Object Storage. Which vector storage strategy best balances security and performance?
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
✓
Use OCI OpenSearch with a private subnet and VCN security lists
Option C is correct because it uses OCI OpenSearch deployed within a private subnet, which ensures that vector data never traverses the public internet, while VCN security lists provide granular traffic control. This architecture balances security (data isolation and access control) with performance (low-latency access within the same VCN or via FastConnect/IPSEC VPN) for sensitive medical records.
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.
- ✗
Store vectors in-memory within the application server
Why it's wrong here
In-memory storage is not durable and cannot scale for large datasets.
- ✗
Use OCI OpenSearch with a public endpoint for low latency
Why it's wrong here
Public endpoints expose the vector store to the internet, compromising security.
- ✓
Use OCI OpenSearch with a private subnet and VCN security lists
Why this is correct
Private subnet ensures network isolation, and security lists control access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a third-party vector database outside OCI
Why it's wrong here
External databases introduce data egress and security compliance risks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a public endpoint is acceptable for 'low latency' (Option B) without recognizing that security requirements for sensitive data override performance considerations, and that private subnet connectivity can still achieve very low latency within the same region.
Detailed technical explanation
How to think about this question
OCI OpenSearch with a private subnet leverages VCN security lists and network security groups (NSGs) to enforce least-privilege access, while the vector index (e.g., using the k-NN plugin with HNSW or IVF algorithms) is stored on persistent block volumes, ensuring both durability and sub-100ms query times for embeddings. In a real-world scenario, a healthcare RAG app would also enable encryption at rest (AES-256) and in transit (TLS 1.2+) on the OpenSearch cluster, and use IAM policies to restrict API calls to only the application's service principal.
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.
TExam Day Tips
- 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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
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FAQ
Questions learners often ask
What does this 1Z0-1127 question test?
Building LLM Applications with RAG and Vector Search — This question tests Building LLM Applications with RAG and Vector Search — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use OCI OpenSearch with a private subnet and VCN security lists — Option C is correct because it uses OCI OpenSearch deployed within a private subnet, which ensures that vector data never traverses the public internet, while VCN security lists provide granular traffic control. This architecture balances security (data isolation and access control) with performance (low-latency access within the same VCN or via FastConnect/IPSEC VPN) for sensitive medical records.
What should I do if I get this 1Z0-1127 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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