The answer is to use a Service Gateway for private subnet access to Generative AI via Service Gateway. This is correct because a Service Gateway enables resources in a private subnet to reach OCI services—including the Generative AI model endpoint—over the OCI internal backbone, completely bypassing the public internet. Traffic remains within Oracle’s private network, eliminating exposure to public IPs and reducing the attack surface, making it the most secure method. On the Oracle Cloud Infrastructure Generative AI Professional 1Z0-1127 exam, this question tests your understanding of secure network architecture for AI model invocation; a common trap is choosing a NAT Gateway or Internet Gateway, which would expose the private instance to the internet. Remember the key distinction: Service Gateways keep traffic private, while NAT Gateways are for outbound internet access. Memory tip: “Service stays secure, NAT needs a net.”
1Z0-1127 Deploying and Managing Generative AI on OCI Practice Question
This 1Z0-1127 practice question tests your understanding of deploying and managing generative ai on oci. 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 invoke an OCI Generative AI model from an application running on a compute instance in OCI. The instance is in a private subnet. What is the most secure method to access the model endpoint?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a Service Gateway to access the endpoint privately.
A Service Gateway allows resources in a private subnet to access OCI services, including the Generative AI model endpoint, over the OCI private network without traversing the internet. This is the most secure method because traffic stays within the OCI backbone, avoiding exposure to public IPs and reducing the attack surface.
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.
✓
Use a Service Gateway to access the endpoint privately.
Why this is correct
A Service Gateway enables private access to OCI services without traversing the internet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an Internet Gateway and public endpoint.
Why it's wrong here
This exposes the traffic to the public internet, reducing security.
✗
Use a VPN Connect to connect to the model's public IP.
Why it's wrong here
VPN connects to a public IP and does not leverage private OCI endpoints.
✗
Use a NAT Gateway to access the endpoint.
Why it's wrong here
A NATGateway still routes traffic through the internet, not fully private.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a NATGateway with a Service Gateway, assuming that any gateway providing outbound access is sufficient, but only a Service Gateway offers private, secure access to OCI services without internet exposure.
Detailed technical explanation
How to think about this question
Service Gateways use the OCI service's private IP address (e.g., for Generative AI, the endpoint is resolved via a private DNS name that maps to an internal OCI IP) and route traffic through the OCI network fabric. This ensures traffic never traverses the internet, and the instance can access the model endpoint without needing a public IP or internet gateway. In practice, this is critical for compliance with data residency and security policies, as all traffic stays within OCI's controlled infrastructure.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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..
What is the correct answer to this question?
The correct answer is: Use a Service Gateway to access the endpoint privately. — A Service Gateway allows resources in a private subnet to access OCI services, including the Generative AI model endpoint, over the OCI private network without traversing the internet. This is the most secure method because traffic stays within the OCI backbone, avoiding exposure to public IPs and reducing the attack surface.
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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Question Discussion
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