Multinational companies now popular use network scheme is the SD - WAN, because SD - WAN has a big advantage is that it can easily implement broad geographic location within the WAN network requirements. Now is not only the multinational companies, most of intercity and cross-regional enterprise with more SD - WAN. If do is domestic SD - WAN network, there are several network enterprise can recommend, but if the multinational, will strongly recommend light group of SD - WAN network scheme, because without him, the light group international network operators resources cover a wide range of mainstream manufacturers, in terms of international networking experience is very rich, is the ability to help companies in the global network operators in the screening of high quality network, improve network experience, it is very important.