9.3 The chapter test | 
- Please explain the difference between TCP and UDP.
 - Please answer the one range of global network IP address of A class.
 - Please answer the one range of private network IP address of C class.
 - Please explain the workflow of the traceroute command.
 - What can we describe to the third item of TCP Wrapper?
 - What is IP Address which Interface of loopback uses?
 
