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age of the firewall include: can be used as the focus of network security policy. Firewall can be used as network traffic congestion points. Information on all incoming and outgoing network must pass through the firewall. Firewall will be a trusted private network and an untrusted public network isolated from the risk ranges from narrow to comprise the entire internal network firewall system, one or several hosts. Resulting in the formation of the structure of a control center, greatly enhanced network security, and simplified network management. Intrusion detection system based on testing different methods can be divided into two categories: anomaly and misuse. To sum up, firewall and IDS functions can be formed in the complementary relationship. This combination of dynamic technology than in the past a single or static technologies have made great improvement. The network's defensive security capabilities greatly enhanced. The linkage between firewall and IDS can be a good play to the advantages of both play down their own shortcomings, so that a more robust defense system of the wall. In the next area of network security, dynamic technology and static technology, the development of linkage will have a huge market, and space. Network security is a major systems engineering, in addition to outside the firewall and intrusion detection systems also include anti-virus technology and encryption technology. Anti-virus technology is to find and remove computer virus technology. The principle is embedded in the anti-virus scanner virus signature engines. Then according to the virus signature database to compare style killing. Encryption key information is hidden to prevent tampering or the information to prevent illegal use of information and conversion data functions or methods. It is the data information is converted to a difficult interpretation of the model to protect information, unless there are decryption key can read the information. Encryption technology, including algorithm and key. Algorithm is the plain text (or can understand the information) and a string of numbers (key) combination, resulting in incomprehensible ciphertext step. The key is used for data encoding and decoding algorithm. Ihttps://www.51lunwen.org/ n the security and confidentiality, you can through appropriate key encryption technology and management mechanisms to ensure the security of information and communication network.

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