What is the focus of OCI's Network Security Groups (NSGs)?

The focus of OCI's Network Security Groups (NSGs) is to provide a more granular level of control over traffic from VCN resources. NSGs allow you to create virtual firewalls within your Virtual Cloud Network (VCN). This means you can define specific rules that govern inbound and outbound traffic based on attributes such as source and destination IP addresses, ports, and protocols.

By effectively leveraging NSGs, you can segment your resources and limit access to only those IP ranges or services that need it, thereby enhancing the security posture of your cloud environment. This level of specificity helps in reducing the attack surface and ensuring that resources within a VCN can communicate securely based on predetermined policies.

While other options may contain elements related to networking and security in OCI, they do not specifically address the primary purpose of NSGs, which is focused on traffic control at a granular level.