?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=MUHAMMAD+ISNAN+ZAKARIA%2C+NIM.+11651027&rft.aulast=MUHAMMAD+ISNAN+ZAKARIA&rft.aufirst=NIM.+11651027&rft.degree=Skripsi&rft.date=26+January+2016&rft.title=ANALISIS+KEAMANAN+DAN+PERFORMANISASI+VOIP+MENGGUNAKAN+VPN+BERBASIS+GNU+LINUX+TRIXBOX+PADA+JARINGAN+WIFI&rft.inst=UIN+SUNAN+KALIJAGA+YOGYAKARTA