Wednesday, 19 February 2020

Firewalls

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Firewalls


? A firewall is a dedicated appliance, or software running on another computer, which
inspects network traffic passing through it, and denies or permits passage based on a set of
rules.
? Firewalls are frequently used to prevent unauthorized Internet users from accessing private
networks connected to the Internet, especially intranets.
? A firewall is simply a program or hardware device that filters the information coming
through the Internet connection into your private network or computer system.
? In computer networking, Demilitarized Zone (DMZ) is a firewall configuration for
protecting local area networks (LANs).
? Firewall proxy servers function at the application layer of the firewall, where both ends of
an association are forced to carry out the session through the proxy.
? A screening router is a fundamental part of most firewalls. A screening router can be a
commercial router or a host-based router with some sort of packet filtering potential.
? An application gateway is an application program that runs on a firewall system between
two networks. It is also known as application proxy or application-level firewalls.
Notes ? Hardware firewalls are precisely what the name entails; a hardware device that is positioned
anywhere in the traffic flow of an organization’s network.


Application Gateway: It is an application program that runs on a firewall system between two
networks.
Firewall: It is a dedicated appliance, or software running on another computer, which inspects
network traffic passing through it, and denies or permits passage based on a set of rules.
Macro: To simplify complicated procedures, many applications allow you to create a script of
commands that the application can run; this script is known as a macro.
Stateful Inspection: It is a newer method that doesn’t examine the contents of each packet but
instead compares certain key parts of the packet to a database of trusted information.
Virus: A virus is a small program that can copy itself to other computers.

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