Tuesday, April 25, 2017

Routers don’t forward broadcasts

The CompTIA Network+ exam expects you to be able to contrast a
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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