OSI Model guide available
August 21, 2009Jeff Zahorowski No Comments »I’ve added a guide to the 7 layer OSI model, which will help illustrate how various pieces of hardware and software interact with each other. Networking is covered in domain 4.0 of CompTIA’s 220-701 A+ Essentials test and domain 3.0 of CompTIA’s 220-702 A+ Practical Application test. Most A+ courseware does a pretty good job of going over the basics of TCP/IP, including DNS, DHCP, SSL and other protocols. However, much is left for the student to figure out regarding how these protocols interrelate.
When looking at the chart, I recommend starting by following the link to “James Bond Meets the 7 Layer OSI Model”. It is perhaps the best description I’ve seen of the process the OSI model is designed to model.
Armed with that knowledge, look particularly at the right side of the chart, which illustrates which particular pieces of hardware and software fit in at a given layer of the OSI model. Remember that transmitted data will be passed down the stack from one layer to the next. That will help clarify the relationship between TCP/IP, routers, switches, NICs, and other elements that are required knowledge on CompTIA’s A+ test.
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