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When you configure the TCP/IP protocol on a computer, an IP address, subnet mask, and a default gateway are required in the TCP/IP configuration settings. To configure TCP/IP correctly, it is necessary to understand how TCP/IP networks are addressed and divided into networks and subnetworks.

IP Address Subnet Requirements

This is a Class C network ID that has not been subnetted. You can represent this in binary as
1100000000.
Each bit in the IP address has a corresponding bit in the subnet mask. Those bits that correspond to the '1' in the subnet mask are considered part of the network ID.

This is a Class C network ID that has been subnetted. Two bits have been borrowed from the host ID of the default C network ID. This allows for a total possible number of four subnets (22) and 62 hosts per subnet (26-2).

This is a Class C network ID that has been subnetted. Four bits have been borrowed from the host ID of the default C network ID. This allows for a total possible number of 16 subnets (24) and 14 hosts per subnet (24-2).