VPN technology in the traditional networks has promoted many eminent and quite popular. However, with cloud computing technology always requires mobility (dynamic) and flexible (elastic) in the Organization as well as the management of the system, then the dynamic VPN technique or elastic VPN will fit. When the number of VPN connections in large cloud system will require the appropriate VPN setup models respectively. There are two models of the VPN is often viewed as the Hub-and-Spoke and Full-Mesh.
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