Which type of VPN configuration allows secure remote access without the need for additional software or hardware clients?

The configuration that allows secure remote access without requiring additional software or hardware clients is known as a clientless VPN. This setup typically operates through a web browser, enabling users to establish a secure connection to the network without needing to install dedicated VPN client applications.

Clientless VPNs leverage web-based solutions, allowing users to access applications and services directly over the internet. This is particularly useful for users who are on devices where they cannot install software, such as public computers or restricted workstations. Such a setup often uses secure protocols like SSL to encrypt the connection, ensuring data confidentiality during transmission.

This approach simplifies the user experience, making it convenient and accessible for those needing quick and secure remote access. In contrast, the other VPN types usually require specific client software or configurations, which may not be as easily accessible in all scenarios.