Prohibit Internet Acces During an exam

[A_A]

Guys and Girls,

Anyone got an quick fix for an way to switch on and of the internet acces during an exam on iMac's with os 10.11.5 on in?

Involves 24 Macs in a smart group, so should be a way to do this.

Off course I could turn of the NIC but then I have to restore that again by hand I think.

Pushing an not existing proxy server would work, but that seems to have some problems also.

Anyone here uses something like this?

[HangerS]

This will do the trick.
Configuration profile -> Parental Controls -> "Limit Access to websites by" -> add some internal site