Metamodel

The ability in the modern waterfall model that allows development to return to the previous phase to correct defects discovered during the subsequent phase.
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A software development process that structures the analysis, design, programming, and testing. Each step is completed before the next step begins.
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A standard that uses three iterations of DES with two or three different keys to increase the effective key strength to 112 bits.
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(1) Layer 2 of the OSI Reference Model. Provides reliable transit of data across a physical link. The datalink layer is concerned with physical addressing, network topology, line discipline, error notification, ordered delivery of frames, and flow control. The IEEE divided this layer into two sublayers: the MAC sublayer and the LLC sublayer. Sometimes simply called the link layer. Roughly corresponds to the datalink control layer of the SNA model. (2) A layer with the responsibility of transmitting data reliably across a physical link (cabling, for example) using a networking technology such as Ethernet. The DLL encapsulates data into frames (or cells) before it transmits it. It also enables multiple computer systems to share a single physical medium when used in conjunction with a media access control methodology such as CSMA/CD.
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A network protocol conceptual model that was derived from TCP/IP. Also known as the DARPA model and the DoD model. The TCP model has four layers as opposed to the OSI model’s seven. Those four layers from the bottom up are Link, Internet, Host-to-Host, and Process.
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