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Firewall

A firewall is a network security software used to maintain, monitor, and control the security of a private network. It establishes a barrier and blocks unauthorized access to or from private networks. It is often employed to prevent unauthorized Web users like hackers or illicit software like viruses and worms from gaining access to private networks connected to the Internet. A firewall may be implemented using hardware, software, or a combination of both and may be purchased as a stand-alone software application.

There are two main types of firewalls namely-

  • Host-based firewall – It is installed on individual servers and monitors incoming and outgoing signals

  • Network-based firewall- This firewall can either be built into the cloud's infrastructure, or it can be a virtual firewall service

Other types of firewalls include-

  • Packet-filtering firewall – It examines packets in isolation and does not know the packet's context

  • Stateful inspection firewall- This type of firewall examines network traffic to determine whether one packet is related to another packet.

  • Proxy firewall- Inspects packets at the application layer of the OSI reference model.

  • NGFW – This next-generation firewall uses a multilayered approach to integrate enterprise firewall capabilities with an intrusion prevention system (IPS) and application control

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