On TCP/IP that would mean routing using TCP info (i.e. port number). When
using certain apps (voice, for example) it's necessary that the router knows
what app is it routing (by using upper layer info) so that it gives apps the
service they need.
Francisco Muniz
"Ms. Maria" <[EMAIL PROTECTED]> escribió en el mensaje de noticias
[EMAIL PROTECTED]
> Hi,
>
> I was reading Karen Webb book on Building Cisco Multilayer Switched
Networks
> (BCMSN). I came across some information on Layer 4 switching that somehow
I
> didn't understand. It says that "Layer 4 switches refer to Layer 3
hardware
> based routing that consider the applications. "
> I understand the Layer 3 switching that is not logical and etc. But what
> about Layer 4 switching??? What new Switches and Routers are supporting
> Layer 4 (Transport Layer) switching?
> If Layer 3 and Layer 4 switching is same than is there any difference?
> Any responses are welcome on this topic.
>
> Thanks for your time!
>
> Maria
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