单项选择题 Which of the following network protocols is used to ensure consistent time across network devices on the domain?（）

单项选择题 Which of the following security mitigation techniques is the MOST effective against zero-day attacks?（）

单项选择题 A user reports that the wireless network is slow and is able to see and access shared folders that are unknown to the user. Which of the following is the cause of the problem?（）