If there is no DHCP server available or you are not using a static IP address an LLA configuration should be applied.
The following article will explain how to set LLA for Linux and Windows
NIC Configuration on Linux - Ubuntu 18.04
On the top right menu click on the networking symbol, select wired connected then click on Wired settings. Finally press the settings button and
Go to the IPv4 Settings’ tab and select under Method Link-local Only
Click on apply and then close
NIC Configuration on Windows 10
Windows will automatically set an LLA IP Address if its fails to obtain an IP Address from the DHCP server.