Quick Answer
The answer is the Service Gateway, which is the correct networking component to enable private subnet access to a model inference endpoint on OCI. A Service Gateway allows resources in a private subnet to reach OCI services—such as the OCI Data Science model deployment endpoint—over the internal OCI network fabric, without any traffic traversing the internet or requiring a public IP. This is essential because the inference endpoint must remain isolated within the same VCN, and the Service Gateway provides that direct, private connectivity by routing requests through Oracle’s backbone rather than through a NAT Gateway or Internet Gateway. On the Oracle Cloud Infrastructure Generative AI Professional 1Z0-1127 exam, this question tests your understanding of secure network architecture for Gen AI workloads; a common trap is confusing the Service Gateway with a NAT Gateway, which only enables outbound internet access for private subnets but does not provide private inbound access to OCI services. Remember the memory tip: “Service Gateway keeps it private and internal—no internet, no NAT, just OCI’s own path.”
This 1Z0-1127 practice question tests your understanding of deploying and managing generative ai on oci. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is deploying a generative AI service on OCI using the OCI Data Science service with a large language model (LLM) in a VCN. The model inference endpoint must be accessible only from a private subnet within the same VCN. Which networking component should be configured to enable this?
NAT Gateway
Why wrong: NAT gateway is for outbound internet access from private subnets.
Dynamic Routing Gateway (DRG)
Why wrong: DRG is used for connecting VCNs or on-premises networks, not for accessing OCI services.
Internet Gateway
Why wrong: Internet gateway would expose the endpoint to the internet.
Service Gateway
Service gateway enables private subnet access to OCI services like Data Science.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Service Gateway
A Service Gateway enables private subnet resources to access OCI services (including the OCI Data Science model deployment endpoint) without traversing the internet. Since the inference endpoint must be accessible only from a private subnet within the same VCN, the Service Gateway provides the necessary private connectivity by routing traffic over the OCI network fabric, not through a NAT or internet gateway.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
NAT Gateway
Dynamic Routing Gateway (DRG)
Why it's wrong here
DRG is used for connecting VCNs or on-premises networks, not for accessing OCI services.
Internet Gateway
Why it's wrong here
Internet gateway would expose the endpoint to the internet.
Service Gateway
Why this is correct
Service gateway enables private subnet access to OCI services like Data Science.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse a Service Gateway with a NAT Gateway, assuming both provide outbound-only access, but the Service Gateway is specifically designed for private access to OCI services, not general internet egress.
Detailed technical explanation
Under the hood, a Service Gateway uses OCI's internal backbone to route traffic to supported OCI services (like Data Science model deployments) without needing public IPs or internet routing. The service gateway relies on the VCN's route table and security list rules to allow traffic from the private subnet to the service's CIDR (e.g., 134.70.0.0/16 for OCI services). In a real-world scenario, this ensures that sensitive LLM inference calls remain within OCI's network, avoiding data egress charges and reducing latency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Deploying and Managing Generative AI on OCI — This question tests Deploying and Managing Generative AI on OCI — Read the scenario before looking for a memorised answer..
The correct answer is: Service Gateway — A Service Gateway enables private subnet resources to access OCI services (including the OCI Data Science model deployment endpoint) without traversing the internet. Since the inference endpoint must be accessible only from a private subnet within the same VCN, the Service Gateway provides the necessary private connectivity by routing traffic over the OCI network fabric, not through a NAT or internet gateway.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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