https://cloud.google.com/blog/products/networking/google-cloud-networking-in-depth-three-defense-in-depth-principles-for-securing-your-environment?hl=en
Follow these network security principles to protect resources running on GCP.
google cloudin depthnetworkingthreedefense
https://www.crowdstrike.com/en-us/blog/defense-in-depth-principles-for-protecting-workloads-crowdstrike-aws/
CrowdStrike and Amazon Web Services collaborate to bring together a principled defense-in-depth approach to securing cloud environments.
defense in depthprinciplesprotectingcloudworkloads