After two years of working in my company, I've found out that the technicians are using my network with another subnet on the same switches. No routing or bridging. Just on the same switch.
My network subnet is 255.255.0.0 and my techicians is using 255.255.255.0. My servers/DHCPs/printers are using sets of IP of 192.168.1.x, 192.168.2.x, 192.168.3.x, 192.168.4.x. My technicians are using only 192.168.200.x.
Is this a going to be a problem?