网卡是大家常提到的一个类型设备的总称，是指安装在主机里，通过网络连接线（双绞线、光纤线缆、同轴电缆等）与网络交换机（以太网交换机、FC交换机、iSCSI交换机等）、或与其它网络设备（存储设备、服务器、工作站等）连接，从而形成一个网络的硬件设备。
因传输协议的不同的，网卡可分为三种，一是以太网卡，二是FC网卡，三是iSCSI岗卡。
以太网卡：学名Ethernet Adapter,传输协议为IP协议,一般通过光纤线缆或双绞线与以太网交换机连接。接口类型分为光口和电口。光口一般都是通过光纤线缆来进行数据传输，接口模块一般为SFP（传输率2Gb/s）和GBIC（1Gb/s）,对应的接口为SC、ST和LC。电口目前常用接口类型为RJ45,用来与双绞线连接，也有与同轴电缆连接的接口，不过现在已经用的比较少了。
FC网卡：一般也叫光纤网卡，学名Fibre Channel HBA。传输协议为光纤通道协议，一般通过光纤线缆与光纤通道交换机连接。接口类型分为光口和电口。光口一般都是通过光纤线缆来进行数据传输，接口模块一般为SFP（传输率2Gb/s）和GBIC（1Gb/s）,对应的接口为SC和LC。电口的接口类型一般为DB9针或HSSDC。
iSCSI网卡：学名iSCSI HBA。传输iSCSI协议。接口类型与以太网卡相同。
光纤网卡一般是指FC HBA卡，而光口的以太网卡一般都叫做光纤以太网卡。不过这些都是大家的俗语或常用语，有一定的使用环境。在我工作的环境中，大家把以太网卡都叫做网卡，把HBA光都叫做光纤卡。
希望大家能清楚同一设备的多个名称，这样才不会技术交流中发生歧义。
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