完整性：只有授权用户有权通过网络修改消息/数据。
Integrity: Only an authorized user is permitted to modify the messages/data over the network.
构建虚拟网络几乎不需修改用户的数据中心基础架构。
Setting up an virtual network requires little modification of the customer's data center network infrastructure.
这允许底层网络的修改，而不需要对应用程序做任何修改。
This allows changes in the underlying network without having to make any changes to the application.
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