Posted by ErmanArslansOracleBlog on Aug 20, 2020; 1:46pm URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/virtual-box-networking-tp8659p8661.html
The article that you follow seems good.
NAT mode means each VM is isolated behind its own router.
NAT Network is the same as NAT except that you can have several VM connected to the same internal router. So, NAT Network networking extends the NAT networking to allow multiple virtual machines to participate...