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No doubt, all firewalls are not same and there are different kinds of firewall technologies available. If you buy a firewall then the better you will pay, the better firewall you can opt for. The benefit of using firewall is that it can keep irritating traffic out of your network. However, if you opt for a cheaper firewall then you may keep the traffic out of your network but you may not avoid a serious attack. Therefore, a cheaper firewall cannot fulfill the requirements of corporate security.