A critical issue is the one that prevents the execution of day-to-day business operations and has no reasonable workaround. It could be a problem with any hardware or software component for the network that:
(i) Denies system-wide access to servers and devices—such as users being unable to access the internet or devices like network printers
(ii) Causes or seriously threatens the loss of valuable data
(iii) Causes prolonged network downtime.