Research on Computer Network Security Anti attack
With the continuous development and improvement of computer technology in practical application, the computer network security requirements are gradually improved, and the understanding of information security connotation is continuously extended. It has expanded from the original information security integrity and reliability to the integrity and non repudiation of information. Information security began to prevent, detect and evaluate security theory and technology. The network can't make it exposed to many dangerous effects, suffering from various types of adverse factors of attack, how to strengthen the prevention of computer networks more security and reliability has become an important issue we are discussing, based on the importance of computer network security The development of common network attack mode and mechanism, and the development of effective security prevention and control strategies, encryption strategy, to enhance the long term security services of computer networks have a positive and effective role in promoting. Theoretical Introduction of Network Security In essence, network security is information security on the network, which refers to the flow of network systems and data saved are not subject to accidental or malicious destruction, disclosure, alteration, the system for normal operation, the network service is not interrupted. Broadly speaking, all related to the network confidentiality, integrity, availability, authenticity and control technologies and theories related information are network security areas to be studied. The expanding range of computer communication is in far beyond the jurisdiction of the local area network. Therefore, the data in transit is vulnerable to attack. On the entire data communication networks, data protect measures must be taken to include the communication itself confirmed the legitimacy and ensure the legality of the communication data in two ways. A network running, its large amount of data and information are stored in the host or terminal, external memory, how to prevent unauthorized users access is essential. Core ARP attacks is to send fake ARP response to the target host, and the target host receives the response mapping between IP and MAC forged, and thus updates the target host cache. In the actual computer network security management will often appear ARP attacks, such as IP address unauthorized use of the phenomenon, which not only affect the normal use of the computer network, but also due to address unauthorized use tend to have a higher authority, the enterprise unit caused a lot of economic losses and potential safety hazards, anti ARP attack has become an important research field of computer network security. Physical security precautions are protected by computer systems, network servers, and other computer related hardware facilities, mainly to prevent these hardware systems are subject to natural and man made damage. In order to form a good physical security environment, the need to determine the user's identity, the use of authority, etc. to build an electromagnetic compatibility work environment, while the need to prevent the computer control room theft, destruction of the emergence of behavior. Common Computer Network Attacks Virus attacks for computer networks mainly refer to computer program instructions or code data that are artificially inserted into a process that can break down the computer's integrated functions and thus affect its normal use and can spread the virus by self replicating. Although the types of 188 5th International Conference on Frontiers of Manufacturing Science and Measuring Technology (FMSMT 2017) Advances in Engineering Research (AER) volume 130