I use PXE server in order to download kickstart and to install Linux.
After installation I saw that
/etc/resolv.conf was created with the IP of the PXE server.
Why there is PXE server IP address in
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resolv.conf can be modified by your DHCP server, which often times may be the PXE server. You have a pre-configured resolv.conf it can still be modified by DHCP and overwritten or modified.
This link has a good explanation.