After submitting quizzes on my educator the program does not communicate what the correct answers are if you get a question wrong. I got 3 questions wrong, of which the answers are no obvious and I am confused. Namely…

Which of the following does a firewall perform?

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  Limits the number of ways an attack can come in
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  Blocks unauthorized packets from entering or exiting the network
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  Detects computers communicating with the Internet without approval
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  All of the above