 |
|
The broadcast model is one in which a host sends to everyone
on the subnet. ARP is not needed because the ethernet broadcast
address is a well-known address with the value 0xFF FF FF FF FF FF
(Broadcast IP addresses also exist and are covered in Chapter 2). In the unicast model, a host
could send an IP packet to any host on any network (assuming we have
a route to the destination host). In the broadcast model, the scope
of the broadcast is the local subnet. Routers block broadcast
traffic, so the scope of a broadcast is limited to the local subnet
(see Figure 1-5). |
| |