In its simplest form - two computers, equipped with ethernet modems, and a suitable length of ethernet vable !
Ethernet is a set of protocols to establish a LAN.
An LAN card is a must if you wish to connect to a LAN but it is not required for WAN
LANs are networks that connect devices, like computers and printers, over short distances typically within an office premises or campus.Communication devices are connected through cables within a distance of 2000 feet.Newer terms like Wireless Local Area Network(WLAN) and Blutooth technology are also associated with LAN today.
An onboard LAN is a built-in ethernet adapter on mother board, if you have an onboard LAN, then, there is no need to install another ethernet card for your purpose.
LAN setup can cover like a build
LAN (Local area network) connects devices (computers) that are within a relatively small geographical are like a room or a building. The most popular connection technology for LANs is Ethernet.
If you are talking about a LAN, then just making sure that all devices and cables are capable of gigabit speeds.
explain the ethernet lan layouts (10base2/10base5/any other)
LAN
It depends on the type of LAN; the most common cable in a LAN is UTP cable. In older LAN types you could also use coaxial copper cable. For UTP cable that would be Cat 5, cat 5E or above for most LANs.
Try this setup: Cable/Dsl Modem---->Wireless router---->wireless devices, desktop.
Ethernet