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TCP/IP
Transmission Control Protocol and Internet Protocol
aka TCP/IP suite and Internet Protocol Suite
A conceptual framework used for designing and implementing network communications protocols in networks. It consists of four layers.
Actually came before the OSI model; in a sense these four layers were expanded out into seven more generic layers
Application Layer (L4)
focused on user interfaces and higher-level protocols (like L7 Application, L6 Presentation, and L5 Session of OSI)
Transport Layer (L3)
responsible for end-to-end communication and data transfer management (TCP, UDP) (like L4 Transport of OSI)
Internet Layer (L2)
handles routing and addressing of data packets for transmission across networks (like L3 Network layer of OSI)
Network Interface Layer (L1)
focused on the network interface for data exchange over physical networks (like the L2 Data Link and L1 Physical layers of the OSI model)