We have already discussed the idea that a VPC is effectively a distributed firewall; it enforces rules and monitors the flow of network traffic. These are the characteristics for the firewall rules:

• The rules defined for one VPC don't apply to others
• They only support IPv4 traffic, so addresses are also IPv4 only
• The only possible actions for firewall rules are allow and deny for ingress or egress
• Firewalls cannot allow traffic in one direction while denying it in the other
• The number of tracked connections vary with machine type

Any firewall rule component will contain direction of traffic, action, protocol, and a numerical value for priority. Priority can range from 0 (the most important) to 65535 (the least important).

Let's see how to create and manage custom firewall rules:

1. To create a firewall rule, you need to provide information...