单项选择题
Which network protocol does DNS use?（）
A.FTP B.TFTP C.TCP D.UDP E.SCP
单项选择题 DNS servers provide what service?（）
单项选择题 Which statement describes the process of dynamically assigning IP addresses by the DHCP server?（）
多项选择题 When a DHCP server is configured, which two IP addresses should never be assignable to hosts? （）
