After successfully authenticating to a remote server, a server administrator is presented with an interactive command line with no graphical interface. Which of the following protocols did the…

SSH is a cryptographic network protocol specifically designed to provide secure, authenticated, and encrypted remote access to a server's command-line environment. Upon successful authentication, SSH presents the user with an interactive shell session, which matches the scenario described. Its use of encryption for both authentication and all session traffic distinguishes it from older plaintext protocols and makes it the industry standard for secure remote administration.

Bash is a command interpreter and scripting language that runs locally on a Unix/Linux system; it is not a network protocol and cannot be used to connect to a remote server.

Telnet provides a remote interactive CLI similar to SSH but transmits all data including credentials in cleartext, making it insecure and not a valid answer where secure connectivity is specified.

FTP is a protocol designed specifically for file transfer between hosts, not for establishing an interactive command-line session on a remote system.