OSI vs TCP/IP models

Bit confused to how these map to one another for the exam as there seems to be debate whether there is 4 or 5 TCP/IP layers...

Accoroding to Richard Deal`s book ...

OSI TCP/IP

Application -
Presentation-
Session - Application
Transport - Transport
Network - Internet
Data Link - Data Link
Physical - Physical

Any clarity on this for the exam?

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Comments

yang11

3-1-1-2

apps

|
present

|
session

| those 3 map to TCP/IP apps

transport

transport

network

internet

datalink

those two map to network access layer
physical

to be corrected.//

johnnynodough

Look at it this way. The OSI and TCP/IP models are 2 completely different models. There is no 7 layer TCP/IP model, only the 4 layer model, and there is no 4 layer OSI model, only 7 layers. While all of the protocls that make the TCP/IP model fit into the OSI model, they are 2 different standards. The OSI model was envisioned to be the network protocols of choice. So instead of your computer using TCP/IP to network, it would use OSI protocols. The OSI standard was defeated by TCP/IP. You wont find many OSI specific protocols used if any at all today. Kinda makes you wonder why they even bring the OSI model up.

Any book or source you found that says there is a 5 layer model is discredible. Anyone can make a model, heck even a 10 layer model if they wanted to, but its not an agreed upon and recognized standard, thats the difference.

And the above post translates the layer comparisons right. ALso google - TCP/IP model versus OSI model - and you should find some good articles that give the background of ISO and DARPA/DoD.

normt

Cheers for the advice, 4 seems to be cisco`s interpretation...

ziggy

someone correct me if I am wrong, but it was explained to me like this.....

The OSI Model is a learning model/reference tool

The TCP/IP Model is an actual working model

Ricka182

ziggy wrote:

someone correct me if I am wrong, but it was explained to me like this.....

The OSI Model is a learning model/reference tool

The TCP/IP Model is an actual working model

Sounds right, how it was explained to me as well. I use this to help define how stacks relate.

my_id_0308

wow Ricka182..that is a really good explanation..i love the facts that is place together in a picture form or a table..make its a lot easier to understand thanks Ricka182

ConfoundedBridge

Recognize the TCP/IP Transport layer as Host-to-Host. I don't know if Cisco ever does, but I've seen it referenced that way quite a bit.

Also, don't confuse the TCP/IP Network Access layer with the OSI's L3.

Webmaster

This image, from my OSI model TechNotes for the CCNA exam, shows the relation between the TCP/IP DoD model and the OSI model: