Which protocol is an open standard protocol framework that is commonly used in VPNs, to
provide secure end-to-end communications?

A.
RSA

B.
L2TP

C.
IPsec

D.
PPTP

Explanation:
IPSec is a framework of open standards that provides data confidentiality, data integrity, and
data authentication between participating peers at the IP layer. IPSec can be used to protect
one or more data flows between IPSec peers.