The protocol V2Ray operates in two modes.
Proxy server — redirects traffic through HTTP or SOCKS proxy, and allows flexible routing configurations for specific IPs or domains. It does not require a separate network interface, and operates at the application level or as a system proxy. Typically, in this mode on Windows devices, the IP changes only in browsers.
VPN mode — often referred to as TUN. In this case, a virtual interface is created to route all network traffic from the device connected to the VPN. This interface is added to the device's network configuration.