By default apipa uses ip addresses that fall between

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By default, APIPA uses IP addresses that fall between 169.254.1.0, and 169.254.254.255 with a 16 bit subnet mask, so, if you're troubleshooting connectivity problems, and you find that the network host has an IP address that falls in this address range, you automatically know that this address was not assigned by a DHCP server, but was assigned automatically by default by APIPA. Basically, the purpose of APIPA is to provide a very basic level of network connectivity, in the event that the DHCP server can't be reached. However, because the address range used by APIPA is on the same local subnet as your network infrastructure devices like servers, and routers and DNS servers,they use static IP addressing, hosts using APIPA addressing usually can't access local network resources, nor can their packets be routed out onto other networks, including the Internet. Duplicate IP Addresses 10:06-10:34 Another issue you might run into is that of duplicate IP addresses, this happens when two hosts on the same IP network are assigned the same IP address. Remember, each host on an IP network must have a unique IP address. Multiple hosts cannot share the same address.
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If duplicate IP addresses are somehow assigned, then network communications are interrupted for the host involved. Now other network hosts that do not have duplicate IP addresses are not affected.It only affects those with the same IP address assigned. Static IP Assignments 10:35-11:12 Now this situation can happen in several ways. First of all, it's possible that multiple hosts have been statically assigned the same IP addressaccidentally, hopefully by the system administrator. This can also occur if a knowledgeable end user statically assigns their workstation an IP addressthat's already in use by another system on the network. It can also occur if an administrator statically assigns an IP address to a host, but that IP address is already included within a range of IP addresses that's managed by a DHCP server, in this situation the DHCP server may assign an address to a network host, even though it's already been statically assigned to another network host. Resolving Duplicate IP Addresses 11:13-12:37 Now there are several measures that you can implement to try to prevent duplicate IP address conflicts. First of all, you should use DHCP to assign IP addresses to workstations, notebooks, and mobile devices in your network. Basically any end-user device in your network should be assigned an IP address via DHCP. You should not use static assignments for these types of devices unless absolutely necessary. Instead, you should reserve static IP address assignments for your network infrastructure devices,such as switches, routers and servers. You should define a range of addresses that will only be used for these static assignments. And you should keep a log of which addresses are assigned to specific hosts.
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