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The next required skill is basic hardware knowledge, computer hardware consist of the physical parts

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of a computer like the central processing unit.

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You monitor mouse, keyboard, computer, data storage, graphics card, sound cards, speaker and motherboard,

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etc..

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By contrast, the software is designed to of instruction that can be stored and run by a hardware.

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For example, suppose you want to hack a machine that is controlled by a computer.

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Firstly, you need to know about the machine or how it's work, correct.

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You have to get the access to the computer that controls the machine.

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Now, the machine will have a very good software security system.

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However, hackers don't care about hardware security, so if you so you can play with the hardware,

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if you can access it.

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If you don't know about hardware, then how will you know how Motherboard works, how you wish to transfer

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data, how bias works, etc., So you must have basic hardware knowledge also to become a great ethical

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hacker.