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:（）
A. RJ-11 connector needs to be re-crimped B. User has plugged into the laptop's NIC port C. User has plugged the wrong end of the cable into the port D. RJ-11 connector needs to be replaced with an RJ-45 connector
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?（）
单项选择题 Which of the following ports is the default telnet port?（）
