A firewall is an application that is installed on a computer or computer network and serves to protect it from interfere access breaking from outsiders. Firewall also serves to protect the data that exist in a computer or computer network, from the delivery of ‘dark’ or data theft.
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All access activities that enter or exit in a network must go through this firewall. Firewalls can also be used as a detector and monitor all incoming data into a network that is maintained.
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The four things that are monitored by the firewall in maintaining a network is the source (source data packet originated), destination (destination computer), the protocol used and the contents of the data packet itself.
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A firewall is an application that is installed on a computer or computer network and serves to protect it from interfere access breaking from outsiders. Firewall also serves to protect the data that exist in a computer or computer network, from the delivery of ‘dark’ or data theft. All access activities that enter or exit in a network must go through this firewall. Firewalls can also be used as a detector and monitor all incoming data into a network that is maintained. The four things that are monitored by the firewall in maintaining a network is the source (source data packet originated), destination (destination computer), the protocol used and the contents of the data packet itself.
So firewalls can be used by Internet users to protect their networks from interference from outside parties by blocking the delivery of data packets from certain addresses, preventing the exchange of data between certain computer units, rejecting data packets with certain content, and preventing the use of certain protocols in data exchange . While some of the techniques on the firewall include:
- Proxy Server, captures the contents of the data from incoming packets and hides its network address information.
- Application Gateway, apply security mechanisms for specific applications such as Telnet and FTP.
- Circuit Level Gateway, using the security mechanisms of TCP or UDP connections.
- Packet Filter, monitors data packets in and out of the network and filters them based on pre-configured rules.