Video presentation: Computer Networks and the Internet. 1.7 History of Computer Networking
1961-1972: early days of packet switching
1972-1980: internetworking; new, proprietary networks
1980-1990: new protocols, many new networks
1990-2000s: commercialization, the Web, new applications
2005-now: more applications, mobility, cloud

Computer networks class.
Jim Kurose
Textbook reading: Section 1.7, Computer Networking: a Top-Down Approach (8th edition), J.F. Kurose, K.W. Ross, Pearson, 2020.
See http://gaia.cs.umass.edu/kurose_ross for more open student resources.