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Definition - What does Network-to-Network Interface (NNI) mean? A network-to-network interface (NNI) is a physical interface that connects two or more networks and defines inter signaling and management processes. It enables the linking of networks using signaling, Internet Protocol (IP) or Asynchronous Transfer Mode (ATM) networks. A network-to-network interface is also known as a network node interface (NNI).
A Virtual Private Network (VPN) supplies network connectivity over a potentially long physical distance. In this respect, a VPN is a form of Wide Area Network (WAN). VPNs enable file sharing, video conferencing and similar network services. A VPN can work over both public networks like the Internet and private business networks. Using a method called tunneling, a VPN runs over the same hardware infrastructure as existing Internet or intranet links. VPN technologies includes various security mechanisms to protect these virtual connections.