TCP/IP Model vs. OSI Model

Hi all. First time poster here.

I'm reading Meyer's net+ and in ch.2 he takes an aside after explaining OSI and says that the TCP/IP model is more widely used.
How relevant is this to the exam? I'm always reading in different job postings about TCP/IP, but not a lot of OSI.

Any thoughts on this?

Thanks,

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Params7

They are intermixed. TCP/IP was officially accepted, but its similar to OSI, and people use OSI terminology commonly to describe TCP/IP layers as well. Just learn what all the 7 layers do, that's all there is to both.

Only difference between them is OSI calls layer 3 network layer while TCP/IP calls it internet layer or something. My memory is hazy. Oh and OSI divides up the Application layer into further 3 layers (session, presentation, application). Their details aren't that important, just know application layer.

DoubleNNs

Computers actually use TCP/IP protocols - not OSI protocols. However, the OSI model has been accepted over the TCP/IP (AKA DoD) model because the OSI model has been deemed superior.

So it's kinda weird because people use the OSI model to describe the TCP/IP protocol stack.

What you want to do is focus on memorizing and fully understanding the OSI model first and foremost. Then just figure out what parts of the TCP/IP model correspond to the OSI model.

Also, because the OSI model is more frequently used, you'll be tested a lot more on the OSI model than on the TCP/IP.

Darril

deep_logic wrote: »

How relevant is this to the exam?
Thanks,

Welcome to the forums.

You'll find that the the OSI model is much more heavily tested than the TCP/IP model on the Network+ exam. You should know:

The names and numbers of each layer in the OSI model
Names of data units on each layer of the OSI model (i.e. segments, packets, frames, and bits)
Which protocols are mapped to which layers of the OSI model
Which hardware devices are mapped to which layers of the OSI model
Which TCP/IP layers map to which OSI layers

Hope this helps.