You demote domain controllers to member servers by uninstalling Active Directory
In recent years, with the advent of the Internet, secure network communication has become increasingly important and is now present in almost every aspect of the network data exchange. One of the most widely used protocols in that area is Secure Sockets Layer (SSL), which is being gradually replaced by its successor - Transport Layer Security (TLS). Even though these protocols were specifically designed for the World Wide Web, their utilization is not limited to just the Web traffic - virtually any type of data sent through any type of network can be secured. Having said that, there are protection goals that define what the secure data means in each case. SSL and TLS provide confidentiality (the data is kept secret from the third party that is not involved in the data exchange), message integrity (the message received is the message sent), and endpoint authentication (one of the communication endpoints or both are verifiably known). If you are working on a project that requires implementation of secure communication channel and that channel must provide the above-mentioned types of data protection, selecting SSL or TLS gives the advantage of a well-documented and well-tested, broadly accepted, and robust protocol.
The SSH protocol uses encryption to secure the connection between a client and a server. All user authentication, commands, output, and file transfers are encrypted to protect against attacks in the network. For details of how the SSH protocol works, see the protocol page. To understand the SSH File Transfer Protocol, see the SFTP page.