Which of the following is a valid APIPA address that may be received if a computer fails to receive an IP address via DHCP?
1) 169.254.0.0
2) 192.168.1.1
3) 10.0.0.1
4) 172.16.0.1
The Correct Answer and Explanation is :
The correct answer is 1) 169.254.0.0.
Explanation of APIPA
APIPA (Automatic Private IP Addressing) is a feature used by devices on a local area network (LAN) when they cannot obtain an IP address from a DHCP (Dynamic Host Configuration Protocol) server. When a device is configured to use DHCP and fails to receive an IP address, it automatically assigns itself an IP address from the APIPA range, which is from 169.254.0.1 to 169.254.255.254. This allows the device to communicate with other devices on the same local network segment without the need for a DHCP server.
The APIPA range is specifically reserved for this purpose and is defined in the Internet Assigned Numbers Authority (IANA) registry. When a computer assigns itself an APIPA address, it can still communicate with other devices on the same subnet that also have APIPA addresses, allowing for basic networking functions. However, devices with APIPA addresses cannot communicate with devices outside the local network, as APIPA addresses are not routable on the Internet.
In contrast, the other options provided are not valid APIPA addresses:
- 2) 192.168.1.1: This address falls within the private IP address range but is not part of the APIPA range. It is commonly used in home networks as a default gateway for routers.
- 3) 10.0.0.1: This address also falls within the private IP address range, specifically designated for larger networks, but again, it is not an APIPA address.
- 4) 172.16.0.1: This address is part of another private IP range defined by IANA, but like the previous options, it is not an APIPA address.
In summary, when a device fails to get an IP address from a DHCP server, it assigns itself a valid APIPA address from the range of 169.254.0.1 to 169.254.255.254, enabling basic local communication.