我正在读这本书http://www.docstoc.com/docs/57226587/Data-Communications-and-Networking-4th---Behrouz-Forouzan“rel=”nofollow“>数据通信和网络第4版Behrouz Forouzan。我在一个练习中有一个问题，问了我以下问题：消息的接收者对8位字符使用校验和技术（校验和），并获得以下信息
100101000011010100101000
.我如何知道发送的数据是否正确？为什么？
我学会了如何计算十六进制值的校验和，但不理解由二进制输出确定的信息是否正确。
发送方计算数据的校验和并将其和数据一起发送到同一消息中。
接收器再次计算接收到的数据的校验和，并检查结果是否与接收到的校验和匹配。
数据和校验和在传输过程中仍有可能被修改，因此它们仍然匹配，但由于随机噪声，发生这种情况的可能性极低。
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