Defense Data Network， DDN
Aggressive network defense
computer network defense CND
Department of Defense Network
dynamic information network defense
administration data network
B-ISDN Broadband – Integrated Service Data Network
Broad band Integrated Service Data Network (B-ISDN)
Cable Broadband Data Network
Cellular Digital Packet Data Network
circuit switched data network
Circuit Switched Public Data Network
Circuit Switched Public Data Network CSPDN
Circuit-Switched Data Network(CSDN)
Circuit-switched Public Data Network