Scenario: The vSwitch Controller in the XenServer resource pool at Nether Tech shut down unexpectedly. A Citrix Engineer noticed that new machines that were turned on after the vSwitch Controller…

Scenario: The vSwitch Controller in the XenServer resource pool at Nether Tech shut down unexpectedly. A Citrix Engineer noticed that new machines that were turned on after the vSwitch Controller went offline were able to communicate with the distributed virtual switch without any restrictions and no access control lists were applied until the vSwitch Controller returned to service. The Citrix Engineer has been tasked to ensure network traffic is NOT allowed for virtual machines turned on after the vSwitch Controller goes offline. Which mode should the Citrix Engineer enable?