PREVENTIVE MAINTENANCE OF COMPUTER SYSTEMS There are three things one can do to prevent viral infection in a computer system. These are:- 1) limited sharing of software 2) limited transitivity 3) limited functionality

one can limit sharing by limiting information flow so as to form a post office set of communicating information domains in a network system , in such a system , a virus will spread only to those domains which are in the transitive flow path from its initial source. in a system with unlimited sharing by limited information paths, limited transitivity may have an effect if users do not use all available paths, but since there is always a direct path between any two user , there s always the possibilities of infection . as an example , in a system , with transitivity limited to a distance of 1, it is safe to share information with any user you trust without having to worry about whether the user has wrongly trusted another user.

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