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The firewall or the network screen — the complex of equipment rooms or software tools exercising control and filtering of the network packets passing through it at the different levels of the OSI model according to the set rules.

The main objective of the network screen is protection of computer networks or separate nodes against unauthorized access. Also network screens are often called filters as their main objective — to do not pass (to filter) the packets which are not suitable under the criteria defined in a configuration.

Some network screens also allow to perform broadcast of the addresses — dynamic replacement of the intra network (gray) addresses or ports by external, used outside a LAN.

The market of corporate network screens arose still in the early nineties when the companies began to integrate the local networks, and since then demand for them only grows. In 2011, by estimates of independent analysts, sales volume grew by 8% that considerably exceeds on growth rate other markets, especially such mature.

The main trend of this market — permanent change of problems which people because of emergence all of new and new computer threats face. And as threats change, also requirements to means of protecting change. Emergence of network screens of the next generation is also connected with it.

According to the policy of Gartner, in an Enterprise Network Firewall segment both large, and medium-sized companies are among leaders of "a magic quadrant", and as the integrating factor serves that all of them develop the solutions capable to satisfy requirements of an enterprise-wide IT environment. Among these requirements it is possible to note a variety of the used models of devices, support of virtualization and virtual local area networks and also an ability to manage and report generation for large and complex environments — multilevel administration, minimization of quantity also the politician, etc. governed. An important element is support of new generation of firewalls (NGFW) as the companies gradually depart from use of the selected IPS devices on perimeter of IT infrastructure and in remote endpoints. The developers of solutions who entered "a magic quadrant" are market leaders. They offer new features for protection against threats, implementing in them all the expert potential. The systems of ensuring network security offered by them have high authority among consumers thanks to lack of vulnerabilities. Distinctive characteristics of such solutions is an ultrahigh capacity and performance and also a possibility of hardware acceleration.

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