IPSEC (Internet Protocol Security): Set of protocols that provide a cryptographic layer to IP
traffic (IPv4 and IPv6). It uses AH (Authentication Header) to provide authentication and integrity
for each packet. ESP (Encapsulation Security Payload) which provides confidentiality and SA
(Security Association) which is a simplex one-way communication (Like a walkie talkie).Can be used
to negotiate ESP or AH parameters.