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Ethernet is a layer 2 network (protocol) and includes the specifications of layer 1 (physical).   Ethernet packets include an address or MAC address.

The Ethernet protocol is based on a topology where all Ethernet endpoints can talk to all endpoints and each endpoint listens to all packets but absorbs only the packets which has the MAC address that matches the endpoint listening.   All the other endpoints where the packet is not destined will ignore the Ethernet broadcast.

Ethernet networks include network devices such as network routers, network switches, network hubs and network gateways.