NETWORK users are waiting with bated breath for the arrival of Ridiculously Fast Ethernet. With a speed or bandwidth of 1,000 megabits per second (mbps), it promises to take networking to dizzy heights. But what is Ethernet? It's a protocol for Local Area Networks (LANs): a set of standards that enable different devices on a network to talk to each other. While Ethernet allows a 10 mbps bandwidth, Fast Ethernet clocks 100 mbps.