The concept of packet filtering is a protective way where each data packet comes in the network is been checked. The most important stuff a firewall do is Packet Filtering. Only after experiencing security-related problems do they realize the importance of documentation, audit, and accountability. Many small as well as medium-size organizations implement firewalls only at a very basic level. Firewall comes under two different categories, hardware firewalls as well as software firewalls. One of the most appropriate way through which you can assure 99% data security is by using a firewall. Data Security is one of the biggest concern for every person who surf the web online.
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