802.1 Internetwork Definition
This defines LAN optimization, bridging and switching for internetworking, or creating networks of networks. Spanning tree algorithms for routing packets in Internets came from this group. These functions deal with examining and filtering traffic that travels along a wire based on physical addresses, to ensure that only traffic destined for hardware addresses on that wire is passed along to that wire. Bridges and switches will be discussed in more detail in the chapter on Network Hardware. For now, be aware that they are devices that isolate segments of the network from unnecessary traffic.
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