CREST Practitioner Security Analyst (CPSA) Practice

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Which type of addressing is utilized by APIPA?

Automatic private IP address range
Static IP addressing
Dynamic DNS service
Public IP addressing scheme

The correct answer is: Automatic private IP address range

Automatic Private IP Addressing (APIPA) is a feature used primarily in Windows operating systems to enable devices on a local network to communicate with each other when there is no DHCP server available to assign IP addresses. When a device fails to obtain an IP address via DHCP, it automatically assigns itself an IP address from a predefined range, specifically from 169.254.0.1 to 169.254.255.254. This self-assigned IP is intended for local communication within the network and allows devices to interact even in the absence of a DHCP configuration. APIPA is particularly useful in small or ad-hoc networks where devices may need to communicate without the need for an external network or formal configuration. Static IP addressing, on the other hand, involves manually setting a fixed IP address for a device, while dynamic DNS service pertains to resolving domain names to changing IP addresses, and public IP addressing refers to IPs that are routable over the internet. Therefore, Automatic Private IP Addressing is the only option that accurately describes the addressing utilized by APIPA.