Best Protocol for Large File Transfer

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When it comes to transferring large files over a VPN session, the protocol that provides the best throughput is DTLS (Datagram Transport Layer Security). Here's why:

SSL/TLS (Secure Sockets Layer/Transport Layer Security) is a widely used protocol for secure communication over the internet. It is often used for secure web browsing (HTTPS), email, and other applications that require data to be transmitted securely. However, SSL/TLS can be slow when it comes to transferring large files, due to the overhead of encryption and decryption.

L2TP (Layer 2 Tunneling Protocol) is a protocol used to create VPN tunnels. However, L2TP does not provide encryption by itself, and therefore requires an additional protocol, such as IPsec, to provide encryption. This additional layer of encryption can slow down the transfer of large files.

IPsec (Internet Protocol Security) is a suite of protocols used to provide secure communication over the internet. It can be used with various protocols, such as IKEv1 or IKEv2, to create VPN tunnels. However, IPsec can be complex to configure and can slow down the transfer of large files.

DTLS (Datagram Transport Layer Security) is a protocol that provides the same level of security as SSL/TLS, but with lower overhead. DTLS is designed to be used with real-time applications, such as voice and video, and can provide fast and secure transmission of large files.

Therefore, in the given scenario, DTLS would be the best protocol to provide the best throughput for transferring large files over the VPN sessions.