单项选择题 Which of the following is the MOST efficient way to troubleshoot network problems?（）

单项选择题 Physical and logical network diagrams are used for which of the following configuration management goals?（）

单项选择题 Computers on a small network are not able to receive new addresses from the DHCP server. However, the administrator has checked the server and ensured it is connected, responding, and functional. Which of the following is the MOST likely problem in this scenario?（）