Creating a combination wireless/wired home network with a Linksys router
You can use a combination of wired and wireless connections to link your computers to the network. For example, you can use an Ethernet cable to connect a desktop computer that is right next to the router, but use wireless network adapters to connect your laptop or computers in other rooms. Since network interface cards (NICs) are less expensive than wireless adapters, this is a way to cut the cost of your network hardware and have a faster connection.
Using Ethernet cables to connect computers that are close to the router
You would generally only use Ethernet cables to connect computers to the wireless network if they are in very close proximity to the router.
Ethernet cable from router to NIC in computer