Early engraving of Joseph Merrick But Joseph Merrick lived on, firmly believing that his mother's experience with the fairground elephant was the root of his problems. Mary Merrick became a Sunday School
TCP/IP Protocol Architecture. TCP/IP protocols map to a four-layer conceptual model known as the DARPA model , named after the U.S. government agency that initially developed TCP/IP. The four layers of the DARPA model are: Application, Transport, Internet, and Network Interface. Each layer in the DARPA model corresponds to one or more layers of the seven-layer Open Systems Interconnection (OSI) model. Figure 1.1 shows the TCP/IP protocol architecture. Figure 1.1 TCP/IP Protocol Architecture. Network Interface Layer
Figure 1.1 TCP/IP Protocol Architecture. Network Interface Layer. The Network Interface layer (also called the Network Access layer) is responsible for placing TCP/IP packets on the network medium and receiving TCP/IP packets off the network medium. TCP/IP was designed to be independent of the network access method, frame format, and medium. In this way, TCP/IP can be used to connect differing network types. These include LAN technologies such as Ethernet and Token Ring and WAN technologies such as X.25 and Frame Relay.