# 网卡

弹性计算实例的网卡（vNIC）是一种软件定义的网络接口，使弹性计算实例能够在虚拟化网络中进行通信。每个 vNIC 都与一个弹性机器实例相关联，其行为类似于物理网卡，使实例能够发送和接收网络数据包。

## 主网卡

创建弹性计算实例时，会同时创建一个主网卡。此主网卡不能解绑。

## 弹性网卡

如果您有更复杂的网络需求，可以在实例上绑定额外的弹性网卡。弹性网卡可以解绑，然后重新绑定到其他弹性计算实例。


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