101. The command to copy the directory covering the whole purpose of the directory is?

101. Command to copy the entire directory covering destination directory is?
     cp
102. Your understanding of the information services?
103. Your understanding of the information security
     Information security is the core of the risk assessment.
     Risk assessment, the risk that the key is acceptable, that is unacceptable.
     Information security building should consider the cost, not blindly sacrifice everything for safety.
104. How to view the number of threads Mo Linux system process creation
105. How to view the Linux system free memory
106. Uptime Output: 06: 46: 46up9days 06:44 1 user load average: the specific meaning 0.14,0.12,0.08
107. To see all the ip address of the current access port 80?
108. How to Plan 2:00 every day to restart
109. How to add static host 202.106.0.20 host 192.168.1.2 through 192.168.1.3 out
110. Description of TCP three-way handshake