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A firewall is a hardware or software (or a combination of hardware and software) that monitors the transmission of packets of digital information that attempt to pass through the perimeter of a network.
It is an effective means of protecting a local system or n/w from n/w related security threats
Subject: An entity capable of accessing objects (process)
Object: Anything to which access is controlled (e.g. files, programs)
Access right: The way in which an object is accessed by a subject (e.g. read, write, execute)
Access control list Decomposition of the matrix by columns Access control list for Segment B: Process2(Read) Access control list for Segment A: Process1(Read,Write) Access control list for program1: Process1(Read,Executre)