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:（）

单项选择题 Which of the following analyzes the entire subnet to identify all hosts that are active?（）

单项选择题 On which of the following network devices would an administrator configure an ACL?（）