In this tutorial we are going to learn what is firewall and how does firewall work and types of firewalls.
So lets Start
Q-1. What is Firewall ?
Ans- Firewall is a network security device that monitors incoming and outgoing network traffic and permits or block data packets based on a set of security rules.
How does a firewall work ?
Firewall carefully analyze incoming traffic based on re-established rules filter traffic comming from unsecured or superior sources to prevent attacks.
Firewalls guard traffic at a computer’s entry point,called ports,which is where information is exchange with external devices.
For example :- Source address 192.168.1.1 is allowed to reach destination 192.168.2.1 over port 22.
Now we learn about the types of firewall
Firewall can either be software or hardware,through its best to have both. A software firewall is a programme installed on each computer and regulates traffic through port number and applications,while a physical firewall is a peice of equipment installed between your network and getway.
1. NEXT- GENERATION FIREWALLS (NGFW)
Combine traditional firewall technology with aditional functionality,such as encrypted traffic,inspections, intrusion prevention system, antivirus and more.
2. PROXY FIREWALLS
Its filters networks traffic at the application level unlike basic firewall, the proxy act an intermediary between two end system.
3. NETWORKS ADDRESSES TRANSLATION (NAT) FIREWALLS
Its allow multiple devices with independent network addresses to connect internet using a single IP address, Keeping individuals Ip addresses hidden.
4. STATEFUL MULTILAYER INSPECTION (SMLI) FIREWALLS
Its filters packet at the network,transport and application layer, complring them against known trusted packets.
This is all what is firewall and how it work and what are the types of firewall.
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