We need to bear in mind 5 key lessons when implementing a zero-trust model:
In today's ecosystems, a single enterprise can operate multiple internal networks, remote offices with their own local infrastructure, remote and/or mobile individuals and Cloud services. According to the study published by NIST, this level of complexity is too much for legacy network security models that are based on the location of the company infrastructure and there isn’t a single, easily identifiable perimeter for all elements.