Question

Which statement about a virtual cloud network (VCN) is true?

A. A VCN can have only one public subnet and more than one private subnet.
B. A VCN can be used with only one instance.
C. A VCN can span OCI regions.
D. A VCN can reside only in a single region but can span multiple availability domains.

Answer 1

The true statement about a virtual cloud network (VCN) is that it can reside in a single region but can span multiple availability domains, facilitating high availability and fault tolerance.

Step-by-step explanation:

The correct statement about a virtual cloud network (VCN) is D. A VCN can reside only in a single region but can span multiple availability domains. This means that within the defined region where the VCN is created, it can be distributed across different availability domains, which are unique locations within a region that are isolated from failures in other availability domains. This multi-AD design allows for high availability and fault tolerance within a single region.

A VCN is not limited to having just one public subnet; it can contain multiple public subnets, each serving different purposes. Additionally, VCNs can support the use of multiple instances rather than being restricted to a single instance, allowing for scalable and flexible network architectures. Lastly, VCNs do not span across multiple Oracle Cloud Infrastructure (OCI) regions; they are region-specific, but cross-region connectivity can be achieved through other means like VCN peering.