随着互联网的成长和云端应用的出现，他们发现需要在传统网络以外来管理身份。

With the Internet's growth and the emergence of cloud apps, they recognized a need to manage identities outside the traditional network.

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4g则能够带来更大的带宽，这将简化和云的交互以及促进新型应用的出现。

Then 4g brings greater bandwidth which both facilitates cloud interactions and enables new applications.

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这些应用的出现带来了带宽的急剧消耗和网络拥塞等问题，而IP组播是有效支持这些应用的重要技术。

The emergence of these applications has brought a sharp bandwidth consumption and network congestion and so on. IP multicast is an important mechanism which can support these applications efficiently.

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