Short for Automatic Private IP Addressing, a feature of later Windows operating systems. With APIPA, DHCP clients can automatically self-configure an IP address and subnet mask when a DHCP server isn’t available. When a DHCP client boots up, it first looks for a DHCP server in order to obtain an IP address and subnet mask.
If the client is unable to find the information, it uses APIPA to automatically configure itself with an IP address from a range that has been reserved especially for Microsoft. The IP address range is 169.254.0.1 through 169.254.255.254. The client also configures itself with a default class B subnet mask of 255.255.0.0. A client uses the self-configured IP address until a DHCP server becomes available.
The APIPA service also checks regularly for the presence of a DHCP server (every five minutes, according to Microsoft). If it detects a DHCP server on the network, APIPA stops, and the DHCP server replaces the APIPA networking addresses with dynamically assigned addresses.
APIPA is meant for non-routed small business environments, usually less than 25 clients.
Short for A Programming Language,a programming language noted for its ability to generate matrixes — data elements presented in rows and columns — and its brevity. The language shortens programs by including loops, or repeated functions, within its fundamental instructions. Created in the early 1960s by Ken Inverson, the language once used only a non-standard […]
Short for Advanced Power Management, an API developed by Intel and Microsoft that allows developers to include power management in BIOSes. APM defines a layer between the hardware and the operating system that effectively shields the programmer from hardware details.
Short for the Asia Pacific Network Information Centre, one of four non-profit organizations that register and administer IP addresses. APNIC serves the Asia Pacific region, which consists of 62 economies.
Short for Authenticated Post Office Protocol, it is similar to the POP protocol except that APOP enables your password to be encrypted while being transmitted over the network. Using POP mail, when you authenticate your username and password in your e-mail client, your password is sent over the network in plain text. If your e-mail […]
Short for Advanced Program-to-Program Communications. Also known as LU 6.2 and based on IBM’s SNA, APPC is a communication protocol that transaction programs in a distributed computing environment can use to talk to each other. Using APPC, interconnected systems can communicate and share the processing of programs. It consists of two interfaces: programming and data-exchange. […]