Cisco CCNA 200-301 Practice Question

IPsec is a suite of protocols used to secure VPN connections by authenticating and encrypting each IP packet in a data stream. It provides data confidentiality, integrity, and authentication between participating peers, making it the standard for securing VPNs in both remote access and site-to-site configurations.

SSL/TLS is primarily used for securing web traffic and is the basis for SSL VPNs, which are often used for client-to-site remote access rather than site-to-site tunnels. GRE and IP in IP are tunneling protocols that allow for the encapsulation of a wide variety of network layer protocols inside virtual point-to-point links but do not provide encryption or authentication by themselves.