APIPA:-
APIPA full form is Automatic Private IP Addressing. It’s feature of windows operating systems, it uses in Windows 98, Windows 2000 and after Windows 98 operating systems and till Windows XP. Automatic Private IP Addressing is configuring in small network or Local Area Network. By Automatic Private IP Addressing, client automatically configure itself to communicate other computer. It provides class B IP and class B subnet mask (255.255.0.0), its range is 169.254.0.1 to 169.254.255.254.
How APIPA works:-
When Windows client boots up. It first looks at the DHCP server and contact the DHCP server to request IP address. When DHCP server is Down and unavailable, then client uses Automatic Private IP Addressing and configure itself for communicate other computer in the network. It regularly check DHCP server and when DHCP server is available the Automatic Private IP Addressing is stops work. Then DHCP replaces the APIPA IP address.
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