In the field of Zero Trust, it's necessary to implement authentication and authorization based on diverse and dynamic contexts from multiple sources. The communication status in a network is one example of effective contextual information for trust evaluation. However, utilization of network-related behavioral information in Zero Trust Networks (ZTN) is not fully explored, particularly the information collected on networking devices. As one approach to enhance the trust evaluation by diversifying the sources of context information, we propose NI-SPA (Network-Information utilizing SPA), a method to utilize the network-related behavior of subjects collected on networking devices as a context for authentication and authorization. NI-SPA takes the form of an extension of Single Packet Authentication (SPA), where necessary information for authentication and authorization is stored in an UDP packet (namely SPA packet) and sent to the PEP (Policy Enforcement Point). In NI-SPA, network behavior information is recorded in NI-SPA-supporting networking devices. Then, in forwarding a SPA packet, they append the collected network-related behavior information about the sender to the packet. This enables authorization and authorization processes based on much more diverse contexts, by utilizing a wider range of behavioral information collected inside the network. Through experiments, we demonstrated the feasibility of this method and network performance degradation kept within practical limits.