LAN

A data-link-layer securityRefers to whether or not IoT devices or data are protected from unauthorized viewers. protocolAn agreed way of doing something. Like a convention, except that protocols tend to be related to processes., largely used with EthernetA very common Layer 1 and 2 standard for wired network connections.. This protects data within a LAN only. It’s normally administered by IT professionals. Not likely to be used within IoTThe Internet of Things. A broad term covering many different applications where "things"  are interconnected through the internet. devices.