Test-Connection it-000571,192.168.20.205     //测试ip连通性，类似ping，用,号可以同时测试多个IP

Test-NetConnection -Computername it-000571 -traceRoute        //追踪域名it-000571的路由

Test-NetConnection 192.168.75.216 -port 3389      //测试192.168.75.216的3389端口是否可连接

1..20 | % { $a = $_; write-host "------"; write-host "10.1.74.$a"; 3389,53,80,445 | % {echo ((new-object Net.Sockets.TcpClient).Connect("10.1.74.$a",$_)) "Port $_ is open!"} 2>$null}              // 针对某IP段 & 多个端口的扫描器