Hi. I expanded my (single - unrouted) network over the weekend by changing the subnet from 255.255.255.0 to 255.255.240.0. I am fairly new to networking but thought that these were two separate subnets and so would not easily talk to each other. I'm glad they do as my job was that much easier but why, during the changeover, did devices on each subnet still communicate with each other? Will I lose connectivity at some point if I missed a subnet change on one of my devices.