DHCP is not enabled by default in the application. The Dell server hardware may have it enabled in the iDRAC.
Disable the DHCP client in the iDRAC:
If you need dhcpv6 disabled, use the same method by selecting DHCPv6 in step 3.
Additional information can be found on Dell's web site at How to configure the Integrated Dell Remote Access Controller 9 (iDRAC9) and Lifecycle Controller network settings