How does networking interface configuration function work on install or when I install a new NIC?

Solution In Progress - Updated -

Issue

  • Need help to understand boot configuration
  • There is no Network Interface Card NIC ifcfg file in /etc/sysconfig/network-scripts
  • I have no ifcfg configuration, I did not configure networking, how is my server configured to use dhcp on boot?

Environment

  • Red Hat Enterprise Linux (RHEL)
  • Red Hat Enterprise Linux 6 (RHEL 6)
  • Red Hat Enterprise Linux 7 (RHEL 7)
  • Red Hat Enterprise Linux 8 (RHEL 8)
  • Using NetworkManager

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