Which of the following is an appropriate measure for increasing network security during remote access?

Using an SSH protocol is an appropriate measure for increasing network security during remote access because SSH, or Secure Shell, is a cryptographic network protocol that provides a secure channel over an unsecured network. It encrypts the data transmitted between the client and the server, ensuring the confidentiality and integrity of the data exchanged. This is especially important for remote access, as it protects against eavesdropping and man-in-the-middle attacks, which can compromise sensitive information.

The other options present security risks. Utilizing an FTP protocol does not provide encryption by default, exposing data to potential interception during transmission. Relying on Telnet for secure communications is also inadequate, as Telnet transmits data in plain text, making it vulnerable to interception. Adopting a public Wi-Fi connection presents further risks, as it can expose remote access tools to various attacks from unsecured networks.