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The "n" in the host's formula represents the number of bits used for host addressing. If we apply the formula (22 - 2), a /30 subnet mask will provide 2 IP addresses. A desktop computer is connected to the network and receives an APIPA address but is unable to reach the VLAN gateway of 10.10.100.254.
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The IP address range for APIPA is (169.254.0.1 to 169.254.255.254) having 65, 534 usable IP addresses, with the subnet mask of 255.255.0.0. History Initially, the Internet Engineering Task Force (IETF) has reserved the IPv4 address block 169.254.0.0/16 (169.254.0.0 – 169.254.255.255) for link-local addressing.
APIPA stands for Automatic Private IP Addressing (APIPA). It is a feature or characteristic in operating systems (eg. Windows) which enables computers to self-configure an IP address and subnet mask automatically when their DHCP (Dynamic Host Configuration Protocol) server isn’t reachable.
Advantages It can be used as a backup of DHCP because when DHCP stops working then APIPA has the ability to assign IP to the networking hosts. It stops unwanted broadcasting. It uses ARP (Address Resolution Protocol) to confirm the address isn’t currently in use.