Example network consists of computers named UHXA and UHXB, connected to a router, and then via a cable modem to the Internet. The network is configured as a subnet. Address 17.76.99.1 is assigned to UHXA, and 17.76.99.2 to UHXB. The subnet has been configured so that the first three octets of its members' addresses are all the same subnet id, 17.76.99, and this fact is expressed by the subnet mask 255.255.255.0 (binary 11111111 11111111 11111111 00000000) configured in the router. When A sends data to amazon.com at 72.21.210.11, the router ANDs the address with the subnet mask, recognizes that the first three octets of the address are not within its subnet, and sends the data over the Internet. When A sends data to B, however, it determines that the destination lies within the subnet. The data is transmitted by broadcasting within the sub-network, with each machine being responsible for discarding data that were not addressed to it.