Clients in a separated subnet can only peer with other clients in what?

Clients in a separated subnet can only peer with other clients in the same subnet due to the fundamental design of network segmentation. This design typically restricts direct communication between different subnets to enhance security and manageability. In this context, each subnet operates as a separate broadcast domain, meaning devices can communicate directly only with others within their local subnet without routing through external gateways or services.

Peering allows clients to exchange data and establish connections for operations like sharing sensor data and updates. When clients are confined to a specific subnet, it ensures that data flows internally within that subnet, thus simplifying network management while adhering to defined security policies.

In contrast, the other options imply broader interconnectivity that is not feasible under typical network segmentation practices. Peering across different subnets or networks would require routing configurations and possibly compromise security controls, which the question specifically highlights as not applicable for clients in a separated subnet.