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Module 2 Section 3 32Building the Network IMPs Interface Message Processors group of identical minicomputers forming a sub network in the ARPANET to handle the passing of messages between different host computers Based on an idea by Wesley Clark The IMPs role would be to Send and receive data Check for errors Route messages Verify that these messages had reached their final destination Who built the first network A firm called BBN Bolt Beranek and Newman which had close links with MIT Their contract was to build four IMPs The first two IMPs were built - one at UCLA and the other at Stanford Research Institute - and the first network experiment took place Two core aspects of the network design Error correction Adaptive routing 33Protocols - what they do and why they matter Protocol A set of rules that form a standard method of doing something In networking a set of rules that determine how two or more computers interact and communicate Internet protocols include TCPIP FTP HTTP and TELNET HTTP Protocol Hypertext Transfer Protocol A client-server protocol used for the exchange of web pages on the World Wide Web Describes how to conduct the four stages of a web transaction connection request response and close TCPIP Transmission Control ProtocolInternet Protocol The core protocols controlling communication on the Internet including many protocols in addition to TCP and IP How do the Internet protocols pass messages They specify the format that a message must take The specify the way in which computers must exchange a message within the context of a particular activity such as oExchanging e-mail oEstablishing remote connections oTransferring files Some of the protocols used today on the Internet Simple Mail Transfer Protocol SMTP - to send and receive electronic mail File Transfer Protocol FTP - to transfer
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