If you are PXE booting your Dell laptop using a USB Type-C to Ethernet adapter (dongle, DA200, WD15 dock etc.), you may encounter a loss of network connectivity when the computer reboots during the imaging process.
If the adapter is disconnected from the USB Type-C port and reconnected, then you select the try again option, connectivity is restored.
This issue is caused due to the RealTek Ethernet driver. Updating the RealTek Ethernet driver to the latest version helps resolve the issue.
Updating the RealTek driver 10.12.1007.2016 into the Windows 10 Preboot environment (PE) image for both System Center Configuration Manager (SCCM) 2012 and Microsoft Deployment Toolkit (MDT) 2013 has been a confirmed solution to this issue.
Select this hyperlink to download the latest USB GBD driver and incorporate the updated Ethernet driver into the boot image.