这意味着您可以通过发送者（和接收者，如果必要的话）的 MAC 地址来验证信息的来源，额外提供了一级安全性。

This means that you can verify the source of the information by using the MAC address of the sender (and the recipient, if necessary), providing an additional level of security.

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电信通常涉及一个信息发送者和一个或多个接收者，他们通过将信息从一地发送到另一地的技术联在一起，如电话系统。

Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another.

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语码这个术语指人们共同遵守的、使信息接收者与发送者之间能够进行交流的一套规则、习俗、限制措施和规范。

The term code refers to the Shared set of rules, conventions, restraints, and norms that permit the communication of a message between a receiver and a sender.

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