Disclaimer: This study guide attempts to touch upon the most important topics that may be covered on the exam but does not claim to necessarily cover everything that one needs to know for the exam. Finally, don't take the three hour time window in the title literally. Data communication, the process of conveying information from one place to another, existed long before computers and dates back to earliest recorded history. As various pre-computer techniques for conveying data reliably over distances were invented, so too were a number of underlying mechanisms that proved to be useful in digital networks.
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