The Global Gen World

There are three different procedures used simultaneously by firewalls to control data flow in a computer system. Firewalls can use a technique called Packet Filtering which evaluates small portions of data against a filter. This technique admits to the system, sections of data that are deemed acceptable while discarding others.

The Proxy Service Method lets the firewall serve as retriever between the Internet and the system where it actually obtains data from the Internet to send to the requesting system. The Stateful Inspection Approach provides that only integral parts of each segment of data are evaluated against a database of information instead of examining entire segments. Incoming information is admitted when there is satisfactory match with the attributes of the information contained within the system.