A device that links several separate LAN's and provides packet filtering between them is called.
A device that links several separate LAN's and provides packet filtering between them is called Switch.
Routers might have a single WAN port and a single LAN port and are designed to connect an existing LAN hub or switch to a WAN. Ethernet switches and hubs can be connected to a router with multiple PC ports to expand a LAN. ... Some routers even have USB ports, and more commonly, wireless access points built into them.
A network switch (also called switching hub, bridging hub, officially MAC bridge) is a computer networking device that connects devices together on a computer network by using packet switching to receive, process, and forward data to the destination device.
Switches allow different devices on a network to communicate. Routers allow different networks to communicate. A router also connects networked computers to the Internet, so multiple users can share a connection.