hi im new in setting up lan.i like to network a small office with around 20 users.i plan to get 3servers :1 win2k advance server for DC,1 win2k for norton antivirus corporate server and one more running on redhat for email server. how can i hooked up all this together? i got a router to connect all the 3servers and a switch for connecting the 20 users to the router.What kind of settings i should do to the DC, norton antivirus corporate server and the redhat?