Answer:
An Automatic Private IP Address.
Step-by-step explanation:
If Windows 10 is configured to use dynamic IP configuration and is unable to contact a DHCP (Dynamic Host Configuration Protocol) server, the default action is to use an Automatic Private IP Address (APIPA).
An APIPA is a type of IP address that is automatically assigned to a device when it is unable to contact a DHCP server. The APIPA address is in the range of 169.254.0.1 to 169.254.255.254 and is used for communication within a local area network (LAN) only, not for communication over the internet.
When a device is unable to contact a DHCP server, it will randomly select an IP address from the APIPA range and will check if the address is already in use on the network. If the address is not in use, the device will use that address as its IP address.
APIPA addresses are useful in situations where a DHCP server is not available or is temporarily offline. They allow devices to continue communicating on the local network without interruption, but they are not suitable for communication over the internet.
It's also important to note that, if the DHCP server is down for a longer period of time and multiple devices on the network are using APIPA addresses, it can lead to IP address conflicts. In this case, it is recommended to troubleshoot and fix the DHCP server to avoid the conflicts.