How could it have been prevented

What went wrong 
How could it have been prevented 
what organizational measures should be instituted
Include examples of each breach, with dates, of when the incident took place. Describe also the outcome.
In addition to your security breach case studies, write a short summary (2 pages, 1.5 spacing) of your key learning points in management of cybersecurity within enterprises.
Submit your assignment as a single document.
The portfolio should reflect correct APA 6th edition citation style and include a page of references.