Key points in this article (Junos)[[https://rtodto.net/pxe-for-network-engineers/|link]]\\

  * Interesting folders:
    * /var/lib/tftpboot/
    * /var/lib/tftpboot/pxelinux.cfg/
    * /var/www/repo/html/ks-70-em1.ks   # whatever is referenced in the centos7.menu above
    * /etc/dhcp/dhcpd.conf