LANs can be connected by device called.... which operate in the data link layer?
LANs can be connected by device called bridge which operate in the data link layer.
Bridges operate on data link layer and they can be used to connect LANs.
A bridge is a type of computer network device that provides interconnection with other bridge networks that use the same protocol. Bridge devices work at the data link layer of the Open System Interconnect (OSI) model, connecting two different networks together and providing communication between them.