What is Firewall and their types?

Question

Accepted Answer

Firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

Firewalls can be hardware, software or cloud-based
Types of firewalls include packet-filtering, stateful inspection, proxy, and next-generation firewalls
Packet-filtering firewalls examine packets and filter them based on source/destination IP address, port number, and protocol
Stateful inspection firewalls track the state of network connections and only allow traffic that belongs to an established connection
Proxy firewalls act as an intermediary between the user and the internet, filtering traffic based on application-level data
Next-generation firewalls combine features of packet-filtering, stateful inspection, and proxy firewalls with additional security measures such as intrusion prevention and application awareness

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