单项选择题 A technician wants to use an existing DHCP server for three additional VLANs. Which of the following features needs to be configured to allow for this addition?（）

单项选择题 Multiple users call from the same location saying that they have no network connectivity. The administrator is unable to ping the main switch at that IDF. Which of the following configuration management documents would the administrator MOST likely consult to troubleshoot the issue?（）

单项选择题 Which of the following is used to reduce the number of public IP addresses required?（）