Full Discussion (A First Look at Google Compute Engine)

You say "No security groups equivalent", but you fail to specify what exactly is missing.

AWS security groups seem to me to be a giant mess and GCP firewalling with instance tags and such is a much clearer and easier to use system that can still do everything that AWS security groups can as far as I can tell.

You can specify what can communicate with what VERY strictly based on CIDR masks and network tags.

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