What information about the network does a subnet mask determine besides the number of possible devices within the subnet?

A subnet mask determines not only the number of possible devices (hosts) within a subnet but also the structure of the network itself. It indicates which part of the IP address belongs to the network (network prefix) and which part belongs to the hosts within that network. This allows:

• To define the boundaries of the subnet — which IP addresses belong to the same subnet.
• To divide a large network into several smaller subnets for organization and traffic management.
• To identify the network address and broadcast address of the subnet.

Thus, the subnet mask helps routers and devices understand where to send packets and how to group addresses within the network.