To establish a secure command-line session with a network device, a terminal emulator that supports encrypted connections is necessary. Encrypted connections are often facilitated by utilizing protocols designed to encrypt the data transmitted over the network, thereby protecting it from interception or eavesdropping. Telnet clients enable terminal emulation but do not encrypt the data, making them unsuitable for secure connections. A web browser is not designed for command-line interface tasks, and while it can provide secure connections via HTTPS, it cannot be used to directly interface with devices requiring terminal emulation. TFTP server software is used for file transfers and does not provide terminal emulation.