Smart locks, video doorbells, motion sensors, and connected cameras have changed what home security looks like. You can check the front porch from another state, lock a door from your phone, or get an alert when someone walks into the backyard. Useful? Absolutely. Complete protection? Not quite. A smart home still depends on ordinary doors, windows, garages, exterior walls, and a network of devices that need attention. Some weak spots are digital. Others are surprisingly low-tech. A better approach is to look at the house as a series of security layers and check what could fail in each one.