When implementing VPN server on Windows Server 2016, what are the three remote access tunneling protocols available for use, and how do they differ?

What will be an ideal response?

When you implement a Windows Server 2016 VPN server, one of three remote access tunneling protocols is used: Point-to-Point Tunneling Protocol, Layer Two Tunneling Protocol, and Secure Socket Tunneling Protocol. Developed by a consortium of vendors including Microsoft, Point-to-Point Tunneling Protocol (PPTP) offers PPP-based authentication techniques and encrypts data carried by PPTP through using Microsoft Point-to-Point Encryption. Microsoft Point-to-Point Encryption (MPPE) is a starting-to-ending-point encryption technique that uses special encryption keys varying in length from 40 to 128 bits. Layer Two Tunneling Protocol (L2TP) works similarly to PPTP. Both protocols use PPP authentication techniques and create special tunnels over a public network, such as the Internet, that reflect intranets and VPNs. Unlike PPTP, L2TP uses an additional network communications standard, called Layer Two Forwarding, that enables forwarding on the basis of MAC addressing (which is the physical address of the network interface) in addition to IP addressing. Secure Socket Tunneling Protocol (SSTP) employs PPP authentication techniques. Also, it encapsulates the data packet in the Hypertext Transfer Protocol (HTTP) used through web communications. This gives VPN communications more versatility over all kinds of mobile connections and through firewalls. In some mobile situations the remote access network communications may be too locked down to permit PPTP or L2TP remote access, but they still allow web access through HTTP.