Meanwhile, to correctly respond to your response, here's what I have right now under MATE:
Network: Card-1: Ralink RT2500 Wireless 802.11bg driver: rt2500pci
Card-2: ADMtek NC100 Network Everywhere Fast Ethernet 10/100 driver: tulip
Card-3: NVIDIA CK8S Ethernet Controller driver: forcedeth
Card-4: Atheros TP-Link TL-WN821N v2 802.11n [Atheros AR9170] driver: carl9170
I'm not exactly sure why 4 drivers appear to be installed. I'm only aware of my USB wireless adapter and my internal Ethernet adapter for wired connections which is currently not in use. I might also have Ethernet "onboard" but I don't think so. Why would I have a card for that installed if it was already "onboard" too?
I didn't understand much about PC hardware when I bought this machine in April 2005 and what I do know today is the result of a gradual learning process from having to replace one-part-at-a-time as they've failed me gradually over the years. I'm a software guy who's never cared to know much about hardware except what it's forced me to learn!