Posted: March 3rd, 2022


Network security 
A firewall is a network security device that screens approaching and active network traffic and chooses whether to permit or block explicit traffic dependent on a defined set of security rules. Firewalls have been the first line of protection in network security for more than 25 years. They set up a boundary among verified and controlled inner networks that can be trusted and untrusted outside networks, for example, the Internet. A firewall can be hardware, software, or both.
There are several types of firewalls such as:
Proxy firewall; An early sort of firewall gadget, a proxy firewall serves as the gateway from one system then onto the next for a particular application. Proxy servers can give extra usefulness, for example, content storing and security by keeping direct connections from outside the system.
Stateful inspection firewall; Presently thought of as a “customary” firewall, a stateful inspection firewall permits or blocks traffic dependent on the state, port, and protocol. It screens all activity from the opening of a connection until it is shut.
Unified threat management (UTM) firewall; An UTM device normally join, in an inexactly coupled way, the elements of a stateful inspection firewall with intrusion prevention and antivirus. 
Next-generation firewall (NGFW); Firewalls have developed past straightforward packet sifting and stateful inspection. Most organizations are conveying next-generation firewalls to block modern dangers, for example progressed malware and application-layer attacks.
threat-focused NGFW; These firewalls incorporate every one of the capacities of a conventional NGFW and furthermore give propelled threat detection and remediation.
In its relevance to the network security, firewall plays the following roles:
Gives defense against outside dangers by declining unapproved connections to the router from potential attackers, for example, hackers.
It additionally shields the network infrastructure from inside. In other words, it blocks active connections from the router. It mitigates the spread of viruses, keyloggers, or malware that have sneaked past the router and on the network. Such malicious software may transmit confidential information back to the hacker, for example, passwords. Just a firewall can keep them from doing such by hindering their connection.
William R. Cheswick, Steven M. Bellovin, Aviel D. Rubin (2003). “Google Books Link”. Firewalls and Internet Security: repelling the wily hacker

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Describing the technology for defeating DDOS attacks would be a great presentation.  
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