a block diagram of a computer network of the present invention.FIGS. 2A, 2B and 2C are a truth table, a block diagram and a flowchart, respectively, illustrating one embodiment of the intelligent firewall of the present invention.FIGS. 3A, 3B and 3C are a truth table, a block diagram and a flowchart, respectively, illustrating another embodiment of the intelligent firewall of the present inventio