In the previous post we saw how to create a Compute Instance in OCI. To do this it was necessary to place it on a network segment, so in today's post we are going to go into the networking part of OCI. Networking is a very broad topic, with a lot of associated resources. Today we will start with the most basic and important one, as it will contain the rest of the networking resources, Virtual Cloud Network (or VCN). A Virtual Cloud Network is a software-defined private network. You have access to the VCN but not to the hardware, as it is all software. A VCN allows resources to communicate securely with the Internet, other instances or on-premise data centers. It resides in a single region and can have up to 5 CIDR Blocks (it is recommended to use the private IP ranges specified in RFC 1918 (10.0.0.0.0/8, 172.16/12 and 192.168/16). In OCI the supported size is from /16 to /30. As the netmask gets larger, the network size gets smaller. We stop at /30 (4 addresses) because a VCN rese...