If you have ever created a Cloud Server with us you will probably already noted the Cloud Virtual Local Area Network (Cloud-VLAN) will be created. You can also create them yourself to organize your network!
With a scaling infrastructure it is important to isolate your networks. You can put all Database- and Webservers into one individual Networks and then create firewall rules to allow your webservers to communicate with your database servers.
Also the Network is able to communicate with the internet, so you don't need public IPs for your database servers. Maybe not even public IPs for your webservers, just one for your load balancer via anycast, which allows you to address multiple servers with one IP address.
We allow you the biggest freedom compared to other providers in terms of network structure and security.