Depends on the subnet mask. If its /24 or 255.255.255.0 then the 255's correspond to the "network" part and the 0 corresponds to the "host" device you mentioned, printer-pc-etc...
On a side note.... re your DSL setup, is it solid? Or does it seem to have intermittent connectivity issues?
The reason I ask is because around here (mid michigan) we have ATT and Verizon for DSL. If you leave their modem (really a 1 port router) in normal mode (with a private IP 192.168 etc) then you are technically double Natting with your linksys router. We have seen this work and its common, but whenever we run into this the customer almost always says his connection is kind of flakey. We try and follow correct network standards when we can
so we usually put the DSL modem in "Bridged mode" then have the actual linksys router do the PPPOE authentication instead. Whenever we do this, customers always say their connection is much, much more solid.
Just a tip.
ps. That is a great analogy D2D! Several years ago I when doing my Cisco certs, I found their method of learning IP addressing very hard, with binary anding etc... I wrote a paper called "How to subnet in your head" and I think it helps a little. Some colleges actually asked me if they could use it! hehe. Its only a couple page document. I'll dig it up and post it in the forum.