In general, we recommend reading more about networking from starting points like Wikipedia and more authoritative sources on network security.
Generally, there are about 4 zones you should have for your Evergreen system. These are as follows:
localhost
.Note that these are ports on external servers to which your Evergreen server(s) might need to connect. As a reminder of basic networking principles, outgoing connections on the Evergreen server(s) are assigned to random ports - so when connecting to port 210 on zed.example.com, your Evergreen server might use local port 37080 to make the connection.
Again: this list is just a start, and by all means incomplete.