Automatic Private IP Addressing - Exam 400-251: CCIE Security Written Exam - Cisco

Automatic Private IP Addressing

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Which address range is representative of Automatic Private IP Addressing?



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A. B. C. D. E. F.


The correct answer is C. 169.254.x.x is the address range that is representative of Automatic Private IP Addressing (APIPA).

APIPA is a feature in Microsoft Windows and some other operating systems that allows devices to automatically self-configure an IP address and subnet mask when a DHCP server is not available on the network. APIPA assigns IP addresses in the range of through, with a subnet mask of

APIPA is designed to help prevent IP address conflicts on a network, as each device will automatically assign itself a unique IP address. However, it should not be relied upon as a long-term solution, as it can cause connectivity issues in some network environments.

Option A, 10.1.x.x, is a private IP address range that is commonly used on internal networks.

Option B, 172.10.1.x, is not a standard private IP address range. Private IP address ranges in the class B network space are 172.16.x.x through 172.31.x.x.

Option D, 196.245.x.x, is not a private IP address range.

Option E, 128.1.1.x, is a public IP address range assigned to various organizations.

Option F, 127.1.x.x, is a loopback address that is used to test network connectivity on a local machine.