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1 SQL Server :
(4) (Customer to Customer,C2C)
(2) Internet
(3) Intranet
10%
B2CB2BB2BB2C
80%
1990ARPANETNSFNETARPANETInternet
Internet
web
EDI
1968ARPANET
70
2
7OSI
4OSI
OSI7
ISOISO
7OSI
2TCP Transportation Control Protocol
3UDP User Datagram Protocol
4ICMP Internet Control Message Protocol
5TCPUDP
2.2.2
3
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IT DTZ IT”
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