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Packet switching
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====Systems Network Architecture==== [[Systems Network Architecture]] (SNA) is [[IBM]]'s proprietary networking architecture created in 1974. An IBM customer could acquire hardware and software from IBM and lease private lines from a common carrier to construct a private network.<ref>{{cite conference |first= R.J. |last= Sundstrom |author2= G.D. Schultz |title= 1980 SNA'S First Six Years: 1974-1980 |book-title= Proceedings of 5th ICCC 80 |pages= 578β585 |date= 1980 |url= http://rogerdmoore.ca/PS/SNA6Y/SNA6.html |archive-date= 2013-10-20 |archive-url= https://web.archive.org/web/20131020142728/http://rogerdmoore.ca/PS/SNA6Y/SNA6.html |url-status= dead }}</ref>
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