虚拟技术供应商管理虚拟层程序及虚拟交换机等此类技术支持；他的工作内容，总的来说，也不在租户的关注范围之内。
The virtual infrastructure provider manages the hypervisors and V switch or equivalent; his role, by all accounts, is outside the tenant's scope of concern as well.
数字版权管理技术从数字内容及其权限的使用、 存储、 交换、追踪等方面给出了全面的解决方案。
The Digital Rights Management (DRM) is a general solution to utilization, storage, exchange and tracking of digital contents and their rights.
后端采用第7层交换技术，按内容转发请求到最佳匹配后端，并直接应答用户。
The back-ends forward the requests by content to the best BE use the layer-7 switching technique, and send ACK directly to the client.
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