单项选择题
A. Provides additional diagnostic LEDs
B. Reduces power consumption
C. Eliminates a single point of failure
D. Reduces total cost of ownership
单项选择题 A group of users report that they can access local resources but cannot access the Internet. Which of the following should the administrator use to test connectivity?（）
多项选择题 Which of the following are required for Hyper-V?（）
单项选择题 Which of the following will MOST likely cause major performance issues on an email server?（）