11/19/2023 0 Comments Firewall in cyber security![]() Stateless & Stateful Packet Filtering Firewall Modern firewalls have a mix of abilities that may place them in more than one of the three categories. These three categories, however, are not mutually exclusive. To prevent illegal modification/access to internal data by an outsider attacker.įirewall is categorized into three basic types − To prevent an attacker from launching denial of service attacks on network resource. Internet is a dangerous place with criminals, users from competing companies, disgruntled ex-employees, spies from unfriendly countries, vandals, etc. Internal network and hosts are unlikely to be properly secured. It is analogous to locking an apartment at the entrance and not necessarily at each door.įirewall is considered as an essential element to achieve network security for the following reasons − It can be a hardware, software, or combined system that prevents unauthorized access to or from internal network.Īll data packets entering or leaving the internal network pass through the firewall, which examines each packet and blocks those that do not meet the specified security criteria.ĭeploying firewall at network boundary is like aggregating the security at a single point. ![]() Types of Firewallįirewall is a network device that isolates organization’s internal network from larger outside network/Internet. Sometimes the inside network (intranet) is referred to as the “trusted” side and the external Internet as the “un-trusted” side. Network partitioning at the boundary between the outside Internet and the internal network is essential for network security. Almost every medium and large-scale organization has a presence on the Internet and has an organizational network connected to it. ![]()
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