本文主要讲述的是防火墙的作用，防火墙是一种提供网络安全的设备，它负责在web上可信区域和不可信区域之间发生流量时，通过网络授予或拒绝访问。防火墙负责作为网络中流量的一个分界点或cop，因为每个通信都需要从它那里流出去，而这是允许流量访问或拒绝访问的区域(Wu和Shan 39)。访问控制是通过防火墙来实施的，使用的是一个正向控制模型，该模型声明只有在防火墙策略中定义的流量才允许通过网络，而不允许其他流量。本篇美国论文代写文章由美国论文通AssignmentPass辅导网整理，供大家参考阅读。
A firewall is a device offering network security which is responsible for granting or rejecting the access over network when flow of traffic happens between a trusted region and an untrusted area over the web. The firewall is responsible for acting as a point of demarcation or a cop of traffic within the network as every communication needs to flow from it and this is the area where traffic is given access or access is rejected (Wu and Shan 39). Access controls are enforced through firewalls using a model for positive control stating that only the defined traffic within the policy of firewall is permitted over the network but the remaining traffic is not allowed.
There has been a major evolution of firewall technology for maintaining pace with the continuously changing needs of security. Major difficulties can be faced in envisioning a globe in the absence of firewalls. Established initially as an approach to allow or restrict external accessibility to specific resources of the network, current capability is enjoyed by firewalls to enforce policies of network security, internet activity of logging and security of business exposure to external threats (Kaur and Rao 77). Firewalls can be identified as extremely effective to support strong authentication of user, enforce policies of network society and activity of internet based logging. Companies consider the utilization of firewalls as the defense of network perimeter for making efficient decisions of security and protecting all hosts from external attacks on private networks. From this point, the firewall of an organization ends up becoming the sole zone of risk from the attacks on internet, while hosting the safety of internet based work.
However, firewalls are not effective in protecting the hosts in connection with internet network without being involved with the enterprise firewall (Jadhav and Agrawal 753-756). The use of internet connection without any reliability upon the infrastructure of company results in exposing the user or host from any specific attack. Firewalls end up offering weak protection against threats or attacks unknown like Trojans or malware. However, it can be successful in complementing anti-virus solutions by the dynamic settlement of new rules on the basis of malware behaviour under observation. Even though there can be deployment of firewalls can take place as hardware and software appliances, these systems have the ability of performing real-time introspection of network traffic without any throughput affected (Budka et al. 209-225). A major combination of rules consistently filtering packets of data finally affects the performance of network further causing bottlenecks. In the future, firewall should be discerning between illegitimate and legitimate traffic for the identifying and plugging new threats automatically. Capabilities of anti-malware scanning are not beyond the capabilities of the firewall in the current era, but the present performance of network affects the crucial needs.
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