Google BeyondCorp was a pioneering initiative by Google to implement modern Zero Trust concepts at scale. Launched in 2011, it replaced the traditional secure perimeter approach with a new philosophy for network security. The system leverages Google's cloud-based network architecture and eliminates the private, privileged network, instead using internet-facing proxies to access resources. BeyondCorp offers several benefits, including scalable global availability, unified access control, improved security posture, and an "it just works" solution for users. However, it also has limitations, such as relevance of a cloud-first model, concerns about internet visibility, compatibility with legacy systems, Google Chrome dependence, and Google Cloud dependence. Modern Zero Trust solutions like Twingate provide alternative options that are easier to deploy and maintain.