01001010.00001001.00000000 01001010.00001001.0000000...
11001100.01001010.00001001.00000000 11001100.01001010.00001001.00000000Notice how the results of the subnet mask are equal? Of course, this is a simpleexample, and we can see just by the address and subnet mask that they are both on thesame network.Now we move into the new building where everyone gets his or her very own office.The office has three stories, so we need to break up our simple network into three seg-ments to route between floors.We must use the same IP address block provided. Oneoption is to borrow bits from the host IDs and create more subnetworks.The number ofsubnets is determined by the value of the bits that we borrow from the host IDs. In theexample in Table 3.8, we have used 2 bits, shown in bold.The last octet of the subnet maskis now 11000000, or 192.The number of hosts per network is 2
6
– 2, or 62.That should bemore than sufficient, so our limitation is the number of networks.