Windows中的Netstat命令显示有关协议的统计信息。下图中显示列表第二列Local Address显示的是本地计算机的名字和端口号。当TCP连接处于SYN_SENT状态时，表示（ ）。
- A.已经发出了连接请求
- B.连接已经建立
- C.处于连接监听状态
- D.等待对方的释放连接响应
正确答案及解析
正确答案
解析
本题考查网络管理命令及 TCP 三次握手建立连接状态。
在 Windows 操作系统中，采用命令 Netstat来显示本机Internet 应用的统计信息。其中Local Address 显示的是本地主机的名称及TCP连接或 UDP 所采用的端口号。
当 TCP 连接处于 SYN_SENT 状态时，表示已经发出了连接请求，等待对方握手信号；处于连接监听状态是对方被动打开，等待连接建立请求，状态为LISTEN；连接已经建立状态是 ESTABLISHED；等待对方的释放连接响应状态是 FIN-WAIT-1。
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