Go back to Networking Devices Home page
What Is a Firewall?
A firewall is a secure and trusted machine that sits between a private network and a public network.[1] The firewall machine is configured with a set of rules that determine which network traffic will be allowed to pass and which will be blocked or refused. In some large organizations, you may even find a firewall located inside their corporate network to segregate sensitive areas of the organization from other employees. Many cases of computer crime occur from within an organization, not just from outside.Firewalls can be constructed in quite a variety of ways. The most sophisticated arrangement involves a number of separate machines and is known as a perimeter network. Two machines
act as "filters" called chokes to allow only certain types of network traffic to pass, and between these chokes reside network servers such as a mail gateway or a World Wide Web proxy server. This configuration can be very safe and easily allows quite a great range of control over who can connect both from the inside to the outside, and from the outside to the inside. This sort of configuration might be used by large organizations.
Typically though, firewalls are single machines that serve all of these functions. These are a little less secure, because if there is some weakness in the firewall machine itself that allows people to gain access to it, the whole network security has been breached. Nevertheless, these types of firewalls are cheaper and easier to manage than the more sophisticated arrangement just described. Figure 9-1 illustrates the two most common firewall configurations.
BEST Network Firewall Software
Some Of The well-known Firewall Softwares:Zone Alarm
Zone alarm is a well known firewall software and it provides protection against the hackers, data theft, pop ups, viruses and other security breaches on the internet.
Outpost Firewall Pro
Outpost firewall pro provides protection against the unauthorized access, intruders, spyware, network attacks and malicious software.
Norton Personal Firewall
Norton Personal Firewall software is well known firewall software. The key features are filtering the outgoing and incoming internet traffic, defense against viruses, Trojan horses, viruses, pop ups and other internet threats.
McAfee Personal Firewall Pro
McAfee Personal Firewall Pro is award winning software that defends your business against the unauthorized access, viruses, hackers and internet spasm.
Bull Guard
Bull Guard Internet security 7.0 has all the security features, which your computer requires. The main features includes spam filter, firewall, anti spyware, antivirus and all in one security features.
Sygate Personal Firewall
Sygate Personal Firewall provides multilayer security for the network, operating system, content, applications and internet access. The advanced features provide protection against the intruders, Trojan horses and DOS attacks.
Panda Platinum Internet Security
Panda Platinum Internet Security protects your confidential information and keeps the hackers out. The key features include antivirus, anti spyware, anti phishing, firewall, identity protect, backup, anti spam and parental control.
Free Web Templates : Nuvio Templates - Free Web Templates & WordPress Themes
Best PHP email Systems and Forms : PHP Email Systems Script and Programs | Free ready to use Contact me form for your Website | Free PHP contact us form script | PHP Webmasters tools and help | Website Ranking - Rankings - Get Website Optimization basics correct, add great linking strategies and your website rankings will rocket. Most Web Masters lack website optimization service skills, website ranking and website optimization services is our specialty.
