According to the OSI model, layer 3 is connectionless and layer 4 is
connection oriented. However, one must remember that the OSI model is
theoretical. Specific protocol implementations do not necessarily adhere to
the OSI model.
Example: TCP and UDP are both layer 4, one is connection oriented the other
is connectionless. Also, take a look at the IPX stack, it does not map
nicely to the OSI model.
mikey
Oscar Rau <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> When you look at TCP and UDP applications, they are placed
> in the Transport layer of the OSI model. Some of the Cisco
> certification literature suggests that connection oriented
> services and connectionless services are handled by Layer 3
> which is the network layer.
>
> Which layer is primarily responsible for connection oriented
> and connectionless services?
>
> Thank you in advance.
> --
>
> Oscar Rau
> [EMAIL PROTECTED]
>
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