What is, in your opinion, the minimum firewall placement for a SCADA system? Solution Supervisory control and data acquisation has a major demand in these recent years on the commerical information technologies such as ethernet,TCP/IP. There are several network security problems from the networks and the networks are passed onto the SCADA and putting industrial production and human safety at risk. The internet has came with many attacks from widerange in the reacent years there are so many cyber attacks that takes place that the network that are connected to SCADA systems. The use of the some common protocols and OS has made the interface easier to isolate from the outside world. So minimum firewall placement must be necessary for a scada systems.