Firewall is either hardware firewall or software firewall that is used to prevent unauthorized access to system from a network.
A firewall checks the information or traffic coming from the internet and either allows or blocks access. To allow or block access depends upon the configuration setting of firewall. There are two types of firewall. Hardware firewall and software firewall. Software firewall is installed on the computer or end user PC and it blocks the all incoming traffics that has no relation or association with outgoing traffic. It also ensure that only required ports are opened for the traffics and other are shuts. The best example of software firewall is windows firewall. However software firewall does not have a lot of functions as compared to hardware firewall.
Hardware firewall do all the functionality of software firewall and it also do zone based filtering, VPN, setting rules based on traffic subnet/hosts etc. Cisco ASA or Checkpoint are the dedicated hardware firewall that are most suitable for larger network.
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