单项选择题
A. The DHCP server has an incorrect gateway configured.
B. The DHCP server was incorrectly configured with a six hour lease time on addresses.
C. The DHCP server was incorrectly configured with no-expiring lease time on addresses.
D. The DNS server is no longer functional and internal name-address resolution is down.
单项选择题 Which of the following routing protocols is strictly a distance vector protocol?（）
单项选择题 An administrator is implementing a wireless network. Which of the following encryption technologies is the MOST secure method and will authenticate devices to the network?（）
单项选择题 Which of the following denotes the FINAL point of responsibility for a service provider?（）