broadcast domain and a collision domain, and you’re now ready to do
that. Both types of domains are defined by the group of nodes that
transmissions can reach. Recall from Chapter 3 that transmissions in a
broadcast domain reach all nodes on a LAN, but are not forwarded by
routers. Therefore, routers define the borders of a broadcast domain,
which is, by definition, a LAN.
In contrast, transmissions in a collision domain reach only those nodes directly
connected to a hub. Therefore, the hub defines the borders of its collision
domain. Figure 4-29 illustrates the difference between broadcast domains
and a collision domain.
Routers don’t forward broadcasts!
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