Google's Network is a vast, secure, and performant Global SDN. This allows us to do some cool things. Therefore, Google has a fundamentally unique value proposition:
- Traffic between zones/regions at Google never leaves Google Network. Therefore, no need to setup VPC or VPN between zones/regions. Makes deployments much much simpler.
- Google Compute Engine is a VPC out of the box, even cross-region. You can carve out your own sub-VPCs easily using firewall rules.
- Traffic from Google to end-user is not being dumped off of Google network as soon as possible. Google carries your traffic as close to the end-user as possible.
Edit: take a look at this as well.. http://googlecloudplatform.blogspot.com/2015/06/A-Look-Insid...