Firewall is a software or hardware device that protects your computer from being attacked over the internet by hackers, viruses, and worms. This may occur either at a large corporate network, or simply at a small home network; both have the same security issues.
Having good firewall allows the server to run smoothly and effectively with high security without having any obstacles or risks over the internet. Firewall consists of different ways of how firewall control over the internet server such as Packet filtering - The small amount of data is analyzed and distributed respected to filter's standard, Proxy service - The firewall collects all the online information and convey it to the requesting system and Stateful inspection - Matches the specific details of data packet with the database of reliable information.
Firewall allows us to either add or remove filters based on various circumstances like IP address, Domain name and specific information - the firewall scan for each packet of information to match with the filter content.
Even though some firewalls offer virus protection, it is recommended to install anti-virus software on each computer. Depending on the layers of security you use, you will determine how many threats can be blocked by your firewall, and prevent any outside user to login into your private network.
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