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  3. For what two purposes does the Ethernet protocol use physical addresses?

For what two purposes does the Ethernet protocol use physical addresses?

admin2019-04-08  26
问题 For what two purposes does the Ethernet protocol use physical addresses?
选项 A、        to uniquely identify devices at Layer 2
B、        to allow communication with devices on a different network
C、        to differentiate a Layer 2 frame from a Layer 3 packet
D、        to establish a priority system to determine which device gets to transmit first
E、        to allow communication between different devices on the same network
答案A,E
解析 考点：考查mac地址的作用。
A：在二层唯一确定一台设备，正确
B：是设备在不同的网络中通信，错误，不同网络通信需要通过IP地址确定。
C：区别二层和三层帧，错误。
D：确定设备的优先级，错误。没有这个功能。
E：是同一网络的不同设备可以通信，正确
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