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
Transmission Control Protocol divides a message or file into packets that are transmitted over the internet and then reassembled when they reach their destination. 1  Internet Protocol is responsible for the address of each packet so it is sent to the correct destination. TCP/IP functionality is divided into four layers, each with its own set of agreed-upon protocols: 1  The Datalink layer consists of methods and protocols that operate only on a link, which is the network component that interconnects nodes or hosts in the network. Protocols in the layer include Ethernet and ARP.