The subnet address must be valid.

The gateway address must belong to the logical network and be different from the subnet address and the broadcast address.

The subnet address:

• Must be valid in relation to the subnet mask.

• Must start at 1.0.0.0.

• Cannot be a class D address.

• Cannot start with 227 (loop back address) or 169.254. (APIPA).

The subnet mask:

• Cannot be a class D subnet.

• Must comply with required format when addressing classful devices.

Each logical network must have unique attribute values.