单项选择题 After installing a new video card, the computer loads Windows and continuously reboots. Which of the following would be the FIRST step that a technician should take?（）

单项选择题 A user is browsing to a newly created internal site called www.comptia.org. After putting incredentials the page comes up blank. Which of the following is MOST likely the cause?（）

单项选择题 Under which of the following circumstances would a technician use IPCONFIG /RENEW?（）