Since the enterprise site can be introduced to the private backbone network, then after accessing multiple enterprise sites, the public cloud private backbone network naturally has the ability to establish a multi-point VPN for the enterprise. At this time, the blueprint of the cloud network drawn by the public cloud has surpassed the scenes of the cloud and the hybrid cloud, and reverse osmosis into the field of SD-WAN. In other words, the public cloud private backbone network is regarded as an enterprise-level WAN network, and the VPC is regarded as a virtualized enterprise branch site. At this point, the boundaries between the public cloud private backbone network and the network operator's WAN network will be further blurred. In fact, as can be seen from the example diagram, there is no essential difference between the public cloud private backbone network and the traditional network operator's WAN network. In contrast, traditional network operators are mainly oriented to specific countries or regions, and have relatively obvious geographical attributes. For public clouds, the construction of private backbone networks is not restricted by geography, and the goal is to cover the whole world. Cloud networking.

　　Third, the development trend of cloud network convergence

　　Beginning in the second half of 2018, some public cloud giants began to push the cloud network's tentacles to provide CPE equipment directly to enterprises. After using this CPE, the enterprise's cloud traffic will be automatically directed to the POPs of the private backbone network. To achieve the so-called "zero configuration into the cloud." After the CPE is integrated into the entire cloud network architecture, the public cloud can provide the export equipment from the enterprise side, the POP points accessed in major cities, the global backbone network, and then the global distribution. The Region and the VPC network on the cloud, from a network perspective, will be a full-downstream solution.

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