Firewall in Windows® 7
To provide protection against viruses, adware, spyware etc. in your system you need to install Firewall Internet security software. The malicious software in your system might cause loss of data from your PC. While you surf on the Internet, your system might get damaged due to various kinds of threats in your system. The adware might take personal information from your system without your knowledge. Unwanted advertisements might appear on your screen during your browsing and it might become a big headache for you. The attack of spyware results in the loss of password from your system. The function of the Firewall is to block the unauthorized access of data by such intruders in your system. The Firewall might also prevent the bugs from entering the Operating Systems and applications in your system. The Firewall should be installed in your system even if your system is installed with an antivirus software.
Following points might give users an idea about the safeguarding of Firewall against online threats:
- Packet filtering
- Application filtering
- Alerting and logging
The Firewall software inspects the source and destination IP addresses and ports in incoming and outgoing TCP/IP packet. Firewall blocks the packet based on the header information. Idle or nonstandard ports such as a listening port opened by a Trojan horse might be blocked by the Firewall. The outgoing traffics on the block might be blocked by the personal Firewall. The source and destination IP addresses to filter packets are used by personal Firewalls. You can configure the Firewall to block packets from specific IP addresses.
Application filtering controls inputs and outputs from an application or service. It is specific to a network traffic titled with service name. The application Firewall might be implemented with software running on a host or a stand-alone piece of network hardware. Various forms of proxy servers are used by the host to proxy traffic before passing it on to the client. The function of the application layer is to inspect the contents of file in traffic and certain websites, viruses etc. might be blocked by the application filtering of the Firewall.
When the Firewall detects an attack it alerts the user and it maintains a system log of these events. Thus the users might identify the threats and Firewall configuration might be properly tuned by the user. The alerting feature of the software helps the users take precautions against various kinds of threats.
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