Should I assume that the BCRAN book by Thomas M.
Thomas & Adam Quiggle (McGraw Hill, Technical Expert)
is not a good book for preparing for the BCRAN exam?
Please advise before I purchase the Cisco Press BCRAN
book.
--- "Michael L. Williams" <[EMAIL PROTECTED]> wrote:
> Check out this article on Cisco web site.
>
>
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/centri4/user/scf4ap1.htm
>
> Also, this page shows how TCP/IP layers function.
>
>
http://www.scan-technologies.com/tutorials/TCPIP%20Tutorial.htm
>
> Basically, I see alot of people trying to make
> everything "fit into layers". Just remember that in
> the OSI model, there are certain functions that are
> associated with each layer. You could have a
> protocol, like IPX from the IPX/SPX suite, that does
> functions of Layer 3 (logical addressing/path
> determination) and Layer 4 (connectionless, needs
> SPX to be connection oriented), so it's hard to say
> that it's a Layer 3 or Layer 4 protocol, because it
> actually performs functions of both. Since the
> Department of Defense (DOD) designed the TCP/IP
> protocol suite and it's "reference layers" before
> the OSI reference model was created, they made their
> own layers. Here's a rough approximation of how
> these layers line up: (I hope your using a fixed
> width font =)
>
> OSI Model Layers TCP/IP Model
> Layers
> ----------------
> -------------------
>
> Application --------+
> Presentation --------+------------> Application
> Session --------+
>
> Network <-------------------------> Network
>
> Data Link <-----------------------> Data Link
>
> Physical <------------------------> Physical
>
> As you can see, the *functions* of the OSI
> Application/Presentation/Session are all handled by
> just the Application layer in the TCP/IP model. So,
> for instance, even thought FTP is in the Application
> Layer in the TCP/IP model, it handles the
> application interface (OSI Application Layer), the
> formatting of data to/from the application (OSI
> Presentation Layer), and opening/closing the session
> (OSI Session Layer).
>
> I hope this helps some..........
>
> Mike W.
>
>
> Sammi <[EMAIL PROTECTED]> wrote in message
>
news:[EMAIL PROTECTED]...
> > Hello,
> > I understand TCP/IP packets, and the OSI Network
> Model 7 layers.
> > However I'm not sure what is meant by TCP/IP
> layers? Would this be
> > reference to the 4 layer IPX model:
> > Application/Transport/Network/Physical, but upon
> typing I see that
> > doesn't make sense either.
> > I guess I have to ask straight out: What is the
> first layer of TCP/IP?
> > From there I should be able to research relevant
> material.
> > Thanks, again, for your help.
> >
> > ___________________________________
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