subneting

The biggest benifit would be less broadcasts on segments of a network. Routers do not pass broadcast transmissions by default, so subnetting your network would essentially create fewer computers on each segment and thus, less boadcasts sucking up bandwidth or in other words more available bandwidth for the PC's on the network segments and faster transmissions with less collisions.

A possible disadvantage, if you are using public IP addresses from your ISP, you will end up with less available IP's than you would have without subnetting. If you're using private IP's (example:10.x.x.x or 192.168.x.x) then it does not matter as much as those allow enough flexibility to overcome this disadvantage of subnetting.

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