This includes application software<span> such </span>as<span> a word processor, which enables a user to perform a task, and system </span>software<span> such </span>as<span> an operating system, which enables other </span>software<span> to run properly, by interfacing with hardware and with other </span>software<span>.
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Computer hardware<span> is the collection of physical parts of </span>a computer system<span>. This includes </span>the computer<span> case, monitor, keyboard, and mouse. It also includes all the parts inside </span>the computer<span> case, such </span>as<span> the hard disk drive, motherboard, video card, and many others. </span>Computer hardware<span> is what you can physically touch.
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Restrictive policy is a kind of policy calls for a firewall to contradict all traffic by default. The first rule denies all traffic on any service and using any port. To permit a specific type of traffic, a new rule must be placed ahead of the deny all rule. A firewall should enforce the overall policy recognized by the network administrator. Enforcement is controlled mainly over setting up packet filtering rules which is a rule base comprises a set of these rules.
