单项选择题 Which of the following is a multifunction device in a SOHO network?（）

单项选择题 Which of the following utilities can be used to list the routing table?（）

单项选择题 A web server is running correctly but sending a RST packet to any client trying to connect using HTTP on TCP port 80. Which of the following tools should be used to determine the listening port of the web server?（）