In this paper, a modern computer network, cloud-based network, which comprises internet of things (IoT), edge servers, and cloud servers for data transmission, is investigated and evaluated. A cloud-based network is modeled as a graph having a set of nodes and a set of links. Each link represents a transmission route, and each node represents a device, such as an IoT device, edge server, and cloud server. In practical, a transmission route comprises several physical lines or virtual channels. Each physical line (virtual channel) may provide a capacity or may fail to imply several and stochastic states. Such a cloud-based network is called a stochastic flow cloud-based network (SCN) herein. System reliability for an SCN is then evaluated. It is defined as the probability of the data being successfully transmitted through the SCN under edge server capacity and budget constraints. The SCN is modeled firstly in order to elucidate the flow relationship among the whole system; capacity limitation of the edge servers and costs of data transmission/process are also considered. Subsequently, we conclude an algorithm to evaluate system reliability. Supervisors can manage the SCN based on system reliability which presents the system capability with capacity and budget consideration.

在本文中，研究和评估了一种现代计算机网络，即基于云的网络，该网络包括物联网（IoT），边缘服务器和用于数据传输的云服务器。基于云的网络被建模为具有一组节点和一组链接的图。每个链接代表一条传输路径，每个节点代表一个设备，例如IoT设备，边缘服务器和云服务器。实际上，传输路径包括若干物理线路或虚拟信道。每个物理线路（虚拟通道）可能会提供一定的容量，或者可能无法暗示几种随机状态。这样的基于云的网络在本文中称为随机流基于云的网络（SCN）。然后评估SCN的系统可靠性。它定义为在边缘服务器容量和预算限制下，数据通过SCN成功传输的概率。为了阐明整个系统之间的流动关系，首先对SCN进行建模。还考虑了边缘服务器的容量限制以及数据传输/处理的成本。随后，我们总结了一种评估系统可靠性的算法。主管可以基于系统可靠性来管理SCN，该可靠性代表了系统功能以及容量和预算方面的考虑。