Talking the Security of Valuation System

Along with the rapid development of the network, the events of illegal intrusion occure ceaselessly, the public attention is thoroughly aroused as to the problem of network security. This paper discusses on the security of DCN network from the angle of system manager, gives some important sinsere advise for the security of unix host user password and file protection, helping users protect their own account security and prevent illegal intrusion by using ACL to filter the information flow passing through the network euipment.