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.