Throughout the last year we have managed to lose all of our networking personnel. Recently I downloaded a 7-day trial of Fluke Network Inspector. I discovered that most of our switches were subnet masked as 255.255.255.0 while our NT and Unix network are subnetted as 255.255.0.0. We have 2 IP ranges (i.e. 136.128.104.1-255 & 136.128.212.1-255). I was told that we should be using 255.255.255.0. We don’t control the router I was a little confused as to why our 1st Cisco switch (connected to the router) did not have a subnet mask. This is the only switch that does not have one assigned. I was told that it was the same as the router since it is our 1st switch. I was also told that it didn’t make a difference which subnet mask I used because the router would know where to send. The questions are (1)which subnet mask should I be using; (2) should the 1st switch have the subnet mask assigned; (3) how difficult will it be to change the NT network (6 servers 105 PCs).