Chapter 7 Blog
Kleinrock had attended a computing conference that assembled scientists from around the world, many of whom were creating digital networks for their own governments. Kleinrock had forgotten his razor at the hotel and was able to see if someone else was logged onto their computer by using software called RSEXEC which showed him who was online at the time. Although the ARPANET was not originally intended to be a means of communication but it soon developed into a communication hotspot. The first online mailing system was created in the early 1960s and was called MAILBOX. To send a message you would need to use a program called SNDMSG and when you wanted to receive mail someone had sent to you then you needed to use READMAIL. Tomlinson became famous as the inventor of SNDMSG and CPYNET but his decision to use the @ sign in email addresses was by far his most famous contribution. Companies soon realized that email was one of the best ways to communicate especially when attempting to get the bosses approval on certain actions. Roberts created the first mail manager software by setting up functions to file mail or delete unwanted mail.
Chapter 8 blog
Bob Kahn went to work for Larry Roberts and left BBN in 1972. What used to be ARPA had now been converted to DARPA, the Defense Advanced Research Projects Agency. Kahn said that the D was always there, but it wasn’t silent anymore. Before Bob Taylor left ARPA in 1969 he created a fund for a fixed-site radio network that was going to be built at the University of Hawaii. During this time mobile computer sites became the next big computer goal. The military was very determined to create these sites because they would be more portable on the battlefield instead of big fixed installations. Many foreign governments and corporations began to develop networking ideas. By 1972 many leaders of various nations formed a group to work together on national networking which was called the International Network Working Group and Vint Cerf was put in charge. In 1973 Cerf began to draw up a rough sketch of what a network of networks would look like. They realized that the host-to-host Network Control Protocol had to be replaced by a more independent protocol. At the end of 1973 Cerf and Kahn successfully created a paper called “A Protocol for Packet Network Intercommunication” which described how messages could be put into and taken out of a data program and instead be sent as end-to-end packets. They labeled these messages as transmission-control protocol messages. The paper also explained gateways which would be able to only read the envelope and the receiving host could read what was inside it.