Although UUCP may be a reasonable choice for low-cost dial-up network
links, there are many situations in which its store-and-forward
technique proves too inflexible, for example in Local Area Networks
(LANs). These are usually made up of a small number of machines located
in the same building, or even on the same floor, that are interconnected
to provide a homogeneous working environment. Typically, you would want
to share files between these hosts, or run distributed applications on
These tasks require a completely different approach to networking.
Instead of forwarding entire files along with a job description, all
data is broken up in smaller chunks (packets), which are forwarded
immediately to the destination host, where they are reassembled. This
type of network is called a packet-switched network. Among other
things, this allows to run interactive applications over the network.
The cost of this is, of course, a greatly increased complexity in
The solution that system--- and many non- sites--- have
adopted is known as TCP/IP. In this section, we will have a look at its