SMC Networks SMC7204BRA manual Subnet masks

Subnet masks

Note: Sometimes a subnet mask does not specify any additional network ID bits, and thus no subnets. Such a mask is called a default subnet mask.

These masks are:

- Class A:	255.0.0.0
- Class B:	255.255.0.0
- Class C:	255.255.255.0

These are called default because they are used when a network is initially configured, at which time it has no subnets.

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