However,this elastic approach to network availability gets strained when mission-critical applications meet expensive public WAN services.The failure of a WAN in a network-centric organization can hurt business.

• 但是，这种有弹性的网络可用性方法在关键任务应用遇到昂贵的公共广域网服务时就有问题了，在以网络为中心的组织中广域网的失效会影响生意。