M. Pathak
The world today is hostile. Only takes a tiny percentage to do a lot of damage. Daily changes in technology, network security professionals have also been forced to constantly change firewalls, routers and other network device configurations to keep up with this technological pace. Firewalls involve more than the technology to implement them. Specifying a set of filtering rules, known as a policy, is typically complicated and error-prone. High-level languages have been developed to simplify the task of correctly defining a firewall’s policy. Therefore, this paper reviews the that only network security architecture by using firewalls are protect internal and external attacks in modern computer networks.