A router connects individual networks, allowing information to move from
one to the other. Systems may be physically different, such as a home office
network and the Internet, or separate from each other, such as cable-sharing
subnets. In this sense, a router forwards data between systems in the same way
that a mail circulation center sends mail between cities. Routers can also
build networks logically from physical connections, preventing the transmission
traffic of one subnet from interfering with another.
Broadcast sends data from one device to all other devices on the network
(one by one). Distributions are used to manage data communication between
computers instead of data transfers. Everyday use of Address Solution Protocol
(ARP) broadcasting, in which a laptop issues an application to its network to
learn which machine is unique
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