Cisco Certified Internetwork Expert (CCIE) Practice Test

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Which address range is representative of Automatic Private IP Addressing?

  1. 10.1.x.x

  2. 172.10.1.x

  3. 169.254.x.x

  4. 196.245.x.x

The correct answer is: 169.254.x.x

Automatic Private IP Addressing (APIPA) is a feature used by devices to automatically assign themselves an IP address from a predefined range when a DHCP server is not available. The specific address range for APIPA is 169.254.0.1 to 169.254.255.254, which allows devices on the same local network to communicate without a manual configuration or a DHCP server. Choosing the address range of 169.254.x.x correctly identifies this APIPA range. When a device detects that it cannot reach a DHCP server within a specified time frame, it selects an IP address from this range to ensure local communication with other devices that may also have self-assigned addresses. This functionality is crucial in local networks where communication must still occur even without a central IP addressing service. Other options represent different types of IP addressing. For instance, addresses starting with 10.1.x.x belong to the Class A private address space, while those in the range of 172.10.1.x fall into the Class B private address space. The 196.245.x.x addresses indicate public IP addresses that are routable on the Internet. Thus, these options do not pertain to the self-assigned IP addresses specified by the APIPA

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