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You are a Cloud Architect troubleshooting connectivity issues in your OCI environment. Your application servers, residing in private subnets within a VCN, need to access Object Storage within the same region to retrieve critical data. You have confirmed that there are no NSG rules blocking traffic between the subnets. However, the instances cannot access Object Storage. You have a Service Gateway configured, and route rules in the private subnets directing traffic for Oracle Services to the Service Gateway. What is the most likely cause of this issue?
Correct Answer: A
* Problem:Private subnet instances can't access Object Storage via Service Gateway. * Setup Check:Route rules point to Service Gateway; NSGs allow traffic. * Evaluate Causes: * A:Incorrect CIDR labels block Object Storage access; likely. * B:Internet Gateway irrelevant for Service Gateway; incorrect. * C:NSGs confirmed open, security lists secondary; less likely. * D:NAT Gateway not used here; incorrect. * Conclusion:Misconfigured Service Gateway CIDR is the most likely issue. Service Gateway requires specific CIDR labels. The Oracle Networking Professional study guide states, "For private subnets to access Object Storage via a Service Gateway, the gateway must be configured with the correct regional Oracle Services CIDR label" (OCI Networking Documentation, Section: Service Gateway Configuration). Misconfiguration prevents access despite proper routing.