The existing techniques mainly analyze network layer protocols and transport layer protocols.
当前主要方法是对网络层和传输层协议进行分析。
Similarly for new transport protocols, we have made it very easy to extend our network-layer support to meet customer demands.
同样，对于新生的传输协议，我们也能很容易地扩展我们的网络层支持以支持客户需求。
The two bottom layers, called the physical layer protocols, take care of the actual signal transfer over the network cable.
称为 物理层协议的两个底层处理网络电缆上的实际信号传输。
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