Powerful mental tools

For summarizing topics covered in this course as a revision exercise.

Virtual Private Cloud (VPC) firewall rules apply to a given project and network. If you want to apply firewall rules to multiple VPC networks in an organization, see Firewall policies. The rest of this page covers VPC firewall rules only.

VPC firewall rules let you allow or deny connections to or from your virtual machine (VM) instances based on a configuration that you specify. Enabled VPC firewall rules are always enforced, protecting your instances regardless of their configuration and operating system, even if they have not started up.

Every VPC network functions as a distributed firewall. While firewall rules are defined at the network level, connections are allowed or denied on a per-instance basis. You can think of the VPC firewall rules as existing not only between your instances and other networks, but also between individual instances within the same network.

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