A public key infrastructure that fails to factor in the growth of the organization and its users will eventually need to be redesigned as the business scales. With new applications coming online daily and many users demanding access via multiple devices, good business planning requires that PKI scalability be considered from the outset. Many organizations will need more than one certification authority to meet their growing requirements. A root CA can act as the master with multiple subordinate CAs covering the various use cases. Alternatively, the organization can plan for scale by establishing multiple root CAs and multiple hierarchies.”]
Source: https://gizmodo.com/sony-awarded-dubious-epic-fail-award-at-hackers-oscar-5828586