Firewalls

A firewall is an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system. It is also a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all computer traffic between different security domains based upon a set of rules and other criteria.
Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.A non-flammable wall in a building designed to prevent a fire from spreading from one part of the building to another. It extends into ceiling and attic space so there is no way for fire to get around the ends, but also typically has holes punched in it for pipes, electric cables etc.
In a computer context, a device or software designed to split a network into two parts and prevent unauthorized connections or viruses from getting from one side to the other. typically has holes punched in it for authorized services like webserver, email.In a PC context, software running on the PC that limits what programs are allowed to connect to the network or to listen for incoming connections, and to limit what ports and addresses the computer may listen on or to.A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.
A firewall is a security device that can be a software program or a dedicated network appliance. The main purpose of a firewall is to separate a secure area from a less secure area and to control communications between the two. Firewalls can perform a variety of other functions, but are chiefly responsible for controlling inbound and outbound communications on anything from a single machine to an entire network.A Hardware Firewall is a physical piece of equipment that sits between the Internet and your computer. An example of a hardware firewall is a broadband router, a common form of Internet connection. The benefit of using a hardware firewall, is that it has the ability to protect multiple computer systems that are connected to it at the same time. This makes it an effective firewall for use in businesses that have multiple computers connected to the Internet, as well as in homes that have more than one computer system.it is a software used to avoid unauthorised access to ur pc and hacking to an extent from external pc.
It also gives us option to set permission on which all info about our pc should others know and whether others need to know our presence in the network..In an expert view, it is security wall checking the data incomes and forward to our files if authorised only..its importance reaches peak levels when u are connected to internet.and it is important offline also.hackers generally create riskware softwares, trojans, malware softwares and release them to the net as normal softwares. if u download any of themlike trojan and install into ur system(denying the notification by antivirus) , the problems start from here.the trojan application disables the taskmanager, disables the registry editor, disables the folder options of control panel, disables the antivirus, disables the windows firewall.in short it disables all the applications which are meant to terminate it.the main aim of hackers in creating trojans is, to steal ur computer information like passwords, bank accounts etc, (whenever u install a trojan and connected to internet).generally windows firewall blocks any attempts made by hackers to view ur computer information.so always have a nice antivirus program and update it regularly. Firewall protection primarily uses packet filtering to detect and block intruders. Some also include application filtering.

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