A little hint to add into documentation for update/upgrade, @docs_team: notify that if an installation is using elrepo driver for a network adapter (like my test-install) this card could possibly not be available during part of the update process.
In fact, this card disappeared after an update/upgrade to 7.4. Luckily, another interface was available so was able to reconfigure as red interface, therefore after another update-process the interface was again available.