单项选择题 The helpdesk is receiving calls about the corporate web server being down. Which of the followingshould be taken NEXT after verifying that the server is unreachable?（）

单项选择题 Which of the following devices would MOST likely integrate a DHCP server?（）

单项选择题 An administrator is having a hard time adding a new switch to the network. After verifying that allthe ports are configured correctly on each switch, which of the following should the administratorverily NEXT?（）