WHAT IS Firewall:
firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.
What Are the Benefits of Firewall Security?
Monitors Traffic. A
firewall monitors all of the traffic entering your computer network. ...
Blocks Trojans. A
firewall helps block Trojan horses. ...
Stops Hackers. Having
a firewall keeps hackers out of your network. ...
Stops Keyloggers.
Having firewall security will reduce the risk of keyloggers monitoring you.
What Is the Purpose of a Firewall
The
Firewall
A firewall is a piece of
software that stands between a computer or network and the Internet. Connecting
a computer directly to the global network is like leaving your front door open,
allowing outsiders free access to your system. Any request will pass through to
vulnerable systems, allowing unscrupulous third parties to exploit your
computers for their own gain. A firewall serves to block these unauthorized
requests, passing through only designated traffic.
Filtering
The primary purpose of a
firewall is packet filtering. When a computer sends a request across the
Internet, it takes the form of small packets of data, which travel through the
network to their destination. The target server responds with its own packets
of data, which return along the same route. A firewall monitors every packet
that passes through it, considering its source, destination and what type of
data it contains, and it compares that information to its internal rule set. If
the firewall detects that the packet is unauthorized, it discards the data.
Typically, firewalls allow traffic from common programs such email or Web
browsers, while discarding most incoming requests. You can also configure a
firewall to disallow access to certain websites or services to prevent
employees from accessing non-work resources while on the clock.
Logging
Another important aspect
of a firewall is its ability to log any traffic that passes through it. By
recording the information from packets that pass through or that it discards,
it can provide you with a clear picture of the kind of traffic your system
experiences. This can be valuable in identifying the source of an external
attack, but you can also use it to monitor your employees’ activities online to
prevent lost productivity.
Internal
Threats
While the primary goal of
a firewall is to keep attackers out, it also serves a valuable purpose by
monitoring outgoing connections. Many types of malware will send out a signal
once they take over a system, allowing the author to trigger specific actions
or even control the computer remotely. A firewall can alert you when an unknown
program attempts to "phone home," alerting you to a possible malware
infection and allowing you to shut it down before it causes major damage to
your network. Heading off a malware attack before it activates will keep your
employees productive, protect vital company data and save you the cost of
cleaning up the problem with other security software.
Characteristics of a firewall ?
Ans :
Different protection levels based on the location of the
computer
When
your PC connects to a network, the firewall applies a security level in
accordance with the type of network. If you want to change the security level
assigned initially, you can do this at any time through the firewall settings.
Protection of wireless networks (Wi-Fi)
This
blocks intrusion attempts launched through wireless networks (Wi-Fi). When an
intruder attempts to access, a pop-up warning is displayed that allows you to
immediately block the attack.
Access to the network and the Internet
It
specifies which programs installed on your computer can access the network or
the Internet.
Protection against intruders
It
prevents hacker attacks that try to access your
computer to carry out certain actions.
Blocks
The
firewall can block the access of the programs that you specify should not be
able to access the local network or the Internet. It also blocks access from
other computers that try to connect to programs installed on your computer.
Definition of rules
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