如下图所示，从输出的信息中可以确定的是（ ）。
- A.本地主机正在使用的端口号是公共端口号
- B.192.168.0.200正在与128.105.129.30建立连接
- C.本地主机与202.100.112.12建立了安全连接
- D.本地主机正在与100.29.200.110建立连接
正确答案及解析
正确答案
解析
netstat/n：以数字形式显示地址和端口号。
主要是关注最后一列的连接建立状态：
established表示连接已经建立成功。time_wait表示4次挥手过程全部完成
a选项使用的是非知名端口，所以不是公共（知名）端口
b选项不是正在与，而是已经建立完成
d选项不是正在与，而是都快要断开连接了
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