I have installed Stretch and I find that NetworkManager gets in my way more often than not, and I would rather familiarize myself with network interface administration at a lower level based on the contents of /etc/network/interfaces.
Which command line programs take over the task network configuration when NetworkManager is disabled?
There are a number of programs like
wicd it is hard to tell which of these are used by
/etc/network/interfaces to configure network settings.