The potential impact that could occur if one of the core technologies in an IT system goes down

Discuss the potential impact that could occur if one of the core technologies in an IT system goes down. For example, if a wireless network fails, what could be the impact on an organization? What could be a backup if the wireless network fails? Support your description with an example, real or potential.

Core technologies are:
-Computer Programs and Programming
-Computer Networks
-Databases
-Information Assurance
-Web Technologies