What is a crucial requirement for establishing a VPN connection?

• A. A VPN client software on the remote computer
• B. Direct access to the internet
• C. Multiple user accounts on the local network
• D. Constant power supply to the server

Answer: (A)

To establish a VPN connection, having VPN client software installed on the remote computer is essential. This software is responsible for creating a secure tunnel for data transmission between the user's device and the VPN server. It authenticates the user and encrypts the data to ensure privacy and security while transmitting over potentially insecure networks, such as the internet. Without this software, the device cannot communicate securely with the VPN server, making it impossible to establish a VPN connection.

The other choices do not meet the core requirement for establishing a VPN. While direct access to the internet is necessary for the communication to take place, the specific requirement for a secure VPN connection hinges on having the appropriate client software installed. Multiple user accounts on the local network may facilitate access for various users but are not a requirement for a single connection. A constant power supply to the server, while important for uptime, does not directly influence the establishment of a VPN connection from a remote computer.