Firewall is a simply a system designed to prevent unauthorized access can be implemented in both hardware and software. This firewall does not allow unauthorized internet users from accessing private network connected to internet. Firewall provides logging and auditing function where a single block point security and audit can imposed .
Most of firewalls block traffic from outside that helps prevent hackers from logging in to machines on your network. Network layer firewalls makes their decision based on the source address, destination address and ports in individual IP packets. Now if we talking about application layer firewall then these are hosts running proxy servers, which permit no traffic directly between networks,
These firewalls can be used as network address translator ,since traffic goes in one side and out other side and tend to enforce more conservative security model s than network layer firewalls. Early application firewalls are not transparent to end user however, modern firewalls are often transparent. For more information about networking security please visit www.qosnetworking .com.
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