A computer system is a collection of hardware and software components designed to provide an effective tool for computation. Computer system are used in every walk of life to assist us in the various tasks we perform. The wide availability of the internet has enhance the use of computer for information sharing and communication. Computer system allows us to store, process, display and communicate information. In any modern computer system even a simple one, in general needs several different programs in order to accomplish its various functions.

Sunday, January 29, 2023

Type of firewalls

A firewall is a network security device that monitors and filters incoming and outgoing network traffic in accordance with previously established security policies in an organization. 

There are 3 types of firewalls:
*Packet filtering
*Stateful Filters
*Application layer

Packet filtering
A packet filtering firewall is a network security technique that regulates data flow to and from a network. Packet-filtering firewalls make processing decisions based on network addresses, ports, or protocols. Packet filtering firewalls are among the oldest firewall architectures.

Packet-filtering firewalls are very fast because there is not much logic going behind the decisions they make. They do not do any internal inspection of the traffic. One important function of packet filtering firewalls is to control and monitor network data to ensure its authenticity and compliance.

Stateful Filters
Stateful firewalls are capable of monitoring and detecting states of all traffic on a network to track and defend based on traffic patterns and flows. Stateful firewalls use modern extensions to track active connections, like transmission control protocol (TCP) and user datagram protocol (UDP) streams. By recognizing incoming traffic and data packets' context, stateful firewalls can better identify the difference between legitimate and malicious traffic or packages.

Application layer
An application firewall is a type of firewall that scans, monitors, and controls network, Internet and local system access and operations to and from an application or service.
Type of firewalls

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