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:
Internet Protocol Security (IPsec) is a technology protocol suite for securing Internet Protocol (IP)
communications by authenticating and/or encrypting each IP packet of a communication session.

IPsec also includes protocols for establishing mutual authentication between agents at the beginning
of the session and negotiation of cryptographic keys to be used during the session.