单选题Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）AL2TPBIPsecCPPTPDRSA
单选题
Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）
A
L2TP
B
IPsec
C
PPTP
D
RSA
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