Which of the following is the definition of internet protocol security ( ipsec)? a remote access client/server protocol. it is a cisco proprietary protocol and provides authentication, authorization, and accounting. authentication and encryption protocol for ipsec that encrypts internet protocol (ip) packets and ensures their integrity. a protocol for communication between two computers. typically, the connection from the client to the server is over a telephone line. a protocol that secures ip communications by authenticating and encrypting each ip packet.