1Z0-1127-25 Practice Question: Building LLM Applications with RAG and Vector Search
A developer is testing a RAG application using OCI Generative AI. They receive an error: 'The model cohere.command-r-plus-v1:0 is not supported in this region.' What is the most likely cause?
⚠ Common exam trap
Oracle often tests the misconception that model availability is global across all OCI regions, leading candidates to overlook region-specific model deployment restrictions.
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 model is not available in the selected OCI region.
The error message explicitly states that the model 'cohere.command-r-plus-v1:0' is not supported in the region. OCI Generative AI models are region-specific; each model is deployed only in certain OCI regions (e.g., us-ashburn-1, eu-frankfurt-1). If the selected region does not host that model, the API returns this error regardless of endpoint formatting, tenancy configuration, or model name spelling.
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 endpoint URL is incorrectly formatted.
Why it's wrong here
A wrong endpoint would give a different error (e.g., 404).
- ✓
The model is not available in the selected OCI region.
Why this is correct
Cohere models are deployed in specific regions; the developer may be in a region where the model isn't provisioned.
- ✗
The tenancy is in a different availability domain.
Why it's wrong here
Availability domains are for compute resources, not for AI model availability.
- ✗
The model name has a typo.
Why it's wrong here
If typo, error would be 'model not found' or similar, but the error specifically says not supported in region.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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