单项选择题
A. A virus has infected the system
B. Corrupted BOOT.INI file
C. Corrupt MBR
D. Boot sector corruption
单项选择题 After moving files from one folder to another, the technician cannot access them. Which of the following MUST the technician do to regain access to these files?（）
单项选择题 A technician needs a wireless access point to cover most of the office. Which of the following should the technician perform FIRST to achieve this? （）
单项选择题 Which of the following IP addresses would a technician ping to verify the integrity of the local TCP/IP stack?（）