Whether wired or wireless, networks can be difficult things to get right, particularly if you are trying to build on an existing network with perhaps a non standard network address or netmask. Even once you get machines talking to one another you still need to think about shared printing and file sharing.

And with wireless networks, range can be a problem for which there are some simple solutions out there, some good and some not. Security may also be an issue as wireless networks can be a risk.