Why Broadcast?
Broadcasts are useful when a host needs to find information without
knowing exactly what other host can supply it, or when a host wants
to provide information to a large set of hosts in a timely manner.
How router treat 255.255.255.255?
The address 255.255.255.255 denotes a broadcast on a local hardware
network, which must not be forwarded. This address may be used, for
example, by hosts that do not know their network number and are
asking some server for it.
Ref: http://tools.ietf.org/html/rfc919
http://ciscodreamer.blogspot.com/search/label/ICMP
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