Service layer: On top of the IMS network architecture, we have the service layer.

服务层：在IMS网络体系结构之上是服务层。

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The three layers described above provide an integrated and standardized network platform to allow service providers to offer a variety of multimedia services in the service layer.

上面描述的三个层提供了一个集成的标准网络平台，以允许服务提供商在服务层中提供各种多媒体服务。

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For defending denial of service attack and ports scanning, we adopt corresponding measures in network layer and transport layer.

对于防御拒绝服务攻击与端口扫描，我们在网络层与传输层分别采取相应的措施进行防范。

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As anyone who wants yet wider and more reliable service and faster speeds will tell you, however, we need much more investment at every layer of the network.

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