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The DDN began as the MILNET , a network formed in 1983 when military sites split off the public ARPANET. As a large-scale, private internet, the DDN provided Internet Protocol connectivity across the United States and to US military bases abroad. Throughout the 1980s it expanded as a set of four parallel military networks, each at a different security level. These networks transitioned to become the NIPRNET , SIPRNET , and JWICS networks in the 1990s. In a manner directly analogous to the ARPANET, the DDN used Packet Switch Node s (PSNs) from BBN Technologies as its routers, and BBN performed network planning and management for the network during much of its existence. DDN TIMELINE
DDN SUBNETWORKS Because the DDN's packet switch nodes were not trusted to simultaneously support traffic of different classification levels ( Multi-level Security ), four worldwide sub-networks were deployed, with packet switches at different classifications physically separated. Classified traffic was encrypted so all traffic could share a common trunking infrastructure. The four DDN subnetworks were:
MILNET and DSNET 1 were common user networks, much like the public Internet, but DSNET 2 was dedicated to supporting the Worldwide Military Command And Control System (WWMCCS) and DSNET 3 was dedicated to supporting the DOD Intelligence Information System (DODIIS). SEE ALSO |
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