1Z0-1127-25 Practice Question: Building LLM Applications with RAG and Vector Search
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?
⚠ Common exam trap
Candidates often 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.
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
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.
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.
- ✗
Use a third-party vector database outside OCI
Why it's wrong here
External databases introduce data egress and security compliance risks.
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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