What are some tips to pass (cisco advdesign) 352-001 exam?

Which of the following is a way the operating system prevents unknown or unauthorized users from accessing the system?

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Hey i really need some solving this problem: 1. encrypt this binary string into cipher text: 110000. include in your answer the formula the decoder would use to decrypt your cipher text in the format (coded answer) x n mod (m) = y & 2. decrypt this cipher text into a binary string: 106 you.