Exam N10-008 topic 1 question 626 discussion

D. IPSec IPSec (Internet Protocol Security) is considered the most secure way to provide site-to-site connectivity. IPSec is a suite of protocols that provides secure communication over IP networks. It is commonly used to establish Virtual Private Network (VPN) connections, ensuring confidentiality, integrity, and authenticity of the data being transmitted between sites. VXLAN (Virtual Extensible LAN), IKE (Internet Key Exchange), and GRE (Generic Routing Encapsulation) are also used in networking but are not specifically designed for providing the same level of end-to-end security as IPSec. VXLAN is used for virtualized networks, IKE is a key exchange protocol often used with IPSec, and GRE is a tunneling protocol that doesn't inherently provide encryption. Therefore, for secure site-to-site connectivity, the most appropriate choice is D. IPSec.