What port does he need to block in the case that:
A user phones the help desk and tells you that he needs to ban Internet access to keep his staff from spending time perusing the web. He's connected to his firewall and wants to know which port he should block to restrict just HTTP traffic during business hours?

A port 80

explanation

HTTP makes use of the well-known port number 80. A question like this will almost certainly appear on the CompTIA A+ test.

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