What feature does OCI provide for isolating traffic for different organizational segments?

The correct choice is Private virtual circuits. Oracle Cloud Infrastructure (OCI) offers private virtual circuits as a means of creating a secure and isolated networking environment for different organizational segments. These private virtual circuits allow organizations to establish dedicated, private connections between their on-premises data centers and OCI resources, ensuring that data traffic is not exposed to the public internet.

Using private virtual circuits, multiple organizational segments can effectively segment their traffic, enabling better security, compliance, and control over data flows. Each segment can have its own dedicated bandwidth and can enforce specific network policies that suit their unique operational requirements.

The other options do not provide the same level of traffic isolation. For instance, a single cross-connect for all traffic lacks the segregation necessary for different organizational needs. Shared IP addresses across all services compromise network isolation because multiple entities could potentially use the same address space, leading to security risks and connectivity issues. Non-redundant connections do not ensure traffic isolation either, as redundancy focuses on availability rather than security or segmentation of traffic. Thus, private virtual circuits are superior for achieving the isolation needed for various organizational segments within OCI.