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近年来，随着计算机网络技术的不断发展，网络应用日益普及。网络已经成为一个无处不在，随时都要用的工具。呆在家里，越来越多的计算机用户可以访问到全球网络系统，丰富的信息资源，经济，文化，军事和社会活动也强烈地依赖于网络，网络社会正在我们面前不断的发展。然而，随着网络应用的不断增多，网络安全问题日益突出，由于连接计算机网络的多样性，终端的分布不均匀，网络的开放性和网络资源共享等因素作为一个结果，计算机网络易受黑客，病毒，恶意软件和其他不当行为的攻击。

In recent years, the continuous development of computer network technology, the increasing popularity of network Applications. Network has become a ubiquitous, nothing without tools. Staying at home more and more computer users can access to the global network system, a wealth of information resources, economic, cultural, military and social activities are also strongly dependent on the network, a networked society is slipping now before us.https://www.51lunwen.org/computer/  However, with the growing number of network Applications, network security issues become increasingly prominent, due to the diversity of connected computer networks, the uneven distribution of the terminal, network openness and sharing of network resources such factors as a result, the computer the network vulnerable to viruses, hackers, malicious software and other misconduct attacks. In order to ensure the safety and smooth flow of information, research computer network security and preventive measures are imminent. I light of actual experience, to talk about network security and prevention techniques. Network security considerations are: sharing of network resources. Resource sharing is the main purpose of the computer network Applications, but for the system security of the attacker to destroy the use of shared resources provided an opportunity. With the networking needs of the growing, the external service request can not be completely isolated, the attacker the opportunity to request access to services is easy to access network data packets. Network openness. Any Internet user a very easy access to information resources on the Internet, which is easy to get into a business, unit and personal sensitive information.Network operating system vulnerabilities. Network operating system is a network protocol and network services to the ultimate realization of one of the vehicles, which not only responsible for the network interface hardware package is also needed to provide network communications services for a variety of protocols and procedures for implementation. As the network protocol to achieve the complexity of the operating system determines that there is bound to the implementation process arising from a variety of shortcomings and gaps.  Said network security firewall is between the internal network and external networks, the security of the system. It makes the Internet or between internal network and external networks with other mutual isolation, restrictions on the network visits, used to protect the internal network. Firewall is usually installed in the internal network and external network connection point. All from the Internet (external network) to transmit information or messages from the internal network must pass through the firewall. The main function of the firewall include:  firewall can flow through it to scan network traffic, thereby filtering out some attacks, so that they will be executed on the target computer. The firewall can be closed without using the port, but it can also prohibit a specific output port. The firewall can prohibit access from specific sites, which can prevent all traffic from an unknown intruder, filtering out unsafe services and control of illegal users of the network access. The main advant本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。