单项选择题 Which of the following troubleshooting steps should be performed NEXT after a core router hasbeen reported down?（）

单项选择题 An administrator would like to know the name of the workstation that is being repaired. Which ofthe following commands, without parameters, will provide this information?（）

单项选择题 A user is attempting to connect to the network remotely using a laptop and dial-up. The user plugsthe cable into the only available laptop connection, but the connector is loose inside the port. TheMOST likely reason the connector is loose is the:（）