Part Di Reasoning

$15.$ A server that controls several ICS devices needs to be aceessed by the administrator from home. Opening the port to Internet is too risky. What solution would you propose?

$16.$ The manager assistant's workstation of a manufacturing plant got infected by malware, which scanned the network for ICS devices and managed to interect with them. An amtivirus and other security measures would have certainly prevented the endpoint from geting infected. Nevertheless, what would you propose to avoid the malware interacting with the ICS devices in case a new infection happened?

$17.$ Research on Sturnet. This worm was intended to attack programmable logic controller $($PIC$)$ operated from PCS$.$ What specific sofiware rum on the PCs to communieate with PLC:$?$