CCNA Crash Course: Day 4

Posted on Wednesday, March 23, 2011, under

Today we’re going to learn about the OSI 7-Layer Reference Model. Here’s a great link for reading about it (more links below too). This model exists for the purpose of simplifying the complex task of thinking about how data is transported over a network, and is used to help networking professionals troubleshoot problems. Here are the layers:
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