The hardware is usually connected by cat5 or cat6 cables. The wall sockets that they are usually plugged into run to a switch or switches that enable them to connect via more cables to the patch panel where the servers are also connected. each item would have its own static IP address(or in some cases they would use DHCP to assign them) so it could be found on the lan. IP addresses allow the switches and routers to direct the input from the computers to the proper machine.
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A LAN Card is the network interface card that is used by the device to communicate with the network. The interface on a PC is Called NIC which is the network interface card learn more on my Youtube channel at Nikitis Technology
Peripherals.
One of the routers you have to connect to internet, another one you have to connect to the first one using a lan cable. You can use any of lan ports of the first router to connect the second one (except internet port, usually it's marked as WAN or similar to). The lan cable should be connected to the WAN port on the second one. Only in such case it works properly.
Local Area Network (LAN) allows two or more computers to access the internet through a single router and, by creating a shared folder/directory, to share data between any computer connected to the LAN.
Ensure it is properly connected, and that the software required to drive it is loaded. If necessary, remove it safely and then reconnect it. When it is connected, check its settings and select whatever is necessary.