在一台安装好TCP/IP协议的计算机上，当网络连接不可用时，为了测试编写好的网络程序，通常使用的目的主机IP地址为（ ）。
- A.0.0.0.0
- B.127.0.0.1
- C.10.0.0.1
- D.210.225.21.255/24
正确答案及解析
正确答案
解析
127.0.0.1是回送地址，指本地机，一般用来测试使用。回送地址（127.x.x.x）是本机回送地址（LoopbackAddress），
即主机IP堆栈内部的IP地址，主要用于网络软件测试以及本地机进程间通信，无论什么程序，一旦使用回送地址发送数据，
协议软件立即返回，不进行任何网络传输。
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