单项选择题
Which of the following is the NEXT step in the troubleshooting theory after identifying the problem?（）
A. Establish a theory of probable cause B. Test the theory C. Implement preventative measures D. Establish a plan of action
多项选择题 Which of the following network connections would use a standard POTS line to both send andreceive Internet packets?（）
单项选择题 Which of the following is needed to boot into the Recovery Console in Windows XP?（）
单项选择题 Which of the following is the MOST common secure web server port?（）
