Jaringan pribadi virtual: Perbedaan antara revisi

* {{cite journal|date=August 2001|title=Necessity is the mother of VPN invention|journal=Communication News|pages=26–28|issn=0010-3632|url=httpshttp://binvaswww.comnews.com/%EB%AC%B4%EB%A3%8Ccgi-ip-%EC%9A%B0%ED%9A%8C-%EC%82%AC%EC%9D%B4%ED%8A%B8-top7bin/arttop.asp?Page=c0801necessity.htm|archiveurl=https://web.archive.org/web/20011217153420/http://www.comnews.com/cgi-bin/arttop.asp?Page=c0801necessity.htm|archivedate=2001-12-17|last=Kelly|first=Sean|access-date=2014-02-06|dead-url=yes}}