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Along with the wide band network and the user scale unceasing growth, the user turns on the service to the wide band the high usability request unceasingly to strengthen, to the telecommunication operation business in the IP city territory, turned on the network and the strut system set the higher secure request. Says from the essence, the network security including the composition network system hardware, software and its transmits the information security in the network, causes it not to send because is accidental or the malicious attack is destructed, the network security already has the technical aspect, also has the management aspect the question, two aspects mutually supplemented, indispensable. The artificial network invasion and the attack behavior cause the network security faced with the new challenge.

As broadband networks and the growing scale of users, users of broadband access business continue to enhance high-availability requirements, the telecom operators in I