What is the function of the SSH protocol when connecting to a server?

The SSH (Secure Shell) protocol is primarily designed to establish secure, encrypted connections between a client and a server, allowing users to communicate and manage network devices securely over an unsecured network. Its core function is to facilitate secure remote access to servers, enabling users to execute commands, transfer files, and perform administrative tasks without the risk of eavesdropping or man-in-the-middle attacks. This level of security is achieved through encryption techniques that protect the data being transmitted, ensuring that sensitive information remains confidential and the integrity of the data is maintained during transmission.

The other options do not accurately describe the primary function of SSH. Unsecured connection methods are inherently vulnerable to various security risks, which directly contrasts with what SSH delivers. Sending email notifications and monitoring server performance are tasks typically handled by different protocols and tools, not SSH. Thus, the function of SSH as a means of providing secure remote access stands out as the most relevant and accurate description of its purpose.