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NetworkingATE
1545 pts.
Q:
Where is a switch on the OSI model?
Networking, Switches, layers, Open systems interconnection, OSI Model
At what layer of the open systems interconnection (OSI) model does a switch operate?
ASKED: Jun 2 2009  5:27 PM GMT
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BlankReg
11280 pts.
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Basically Ethernet switches operate at layer 2. They use the MAC address to make the forwarding decisions, which is the Data Link Layer address.

In more recent times switches have also been developed that can use the Layer 3, or Network Layer, information to make the forwarding decisions. These are then routing packets based on the protocol, such as IP. These are usually known as Layer 3 Switches ! Actually what most of these do is examine the first packet, and then route that one, and add the information about this to the switch data base and switch all the remianing packets in the conversation. This way they can effectively route the packets at much higher speeds than a conventional router which does examine every packet at layer 3..

Hope this answers your question.
Last Answered: Jun 2 2009  11:03 PM GMT by BlankReg   11280 pts.
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Bhupendra   190 pts.  |   Jul 2 2009  7:41AM GMT

As your question, L2 switch exist on Layer 2 means on Datalink Layer.
But switches exists on Layer 3 (Network Layer), Layer 4 (Transport Layer) & Layer 7 (Application Layer) as well.

So in a glance, we can say as of now, we have Layer 2 Switch, Layer 3 Switch, Layer 4 Switch and Layer 7 Switch.

If you have any query in future regarding networking (LANWAN Routing & Switching). So plz feel free to write me on my mail ID :  <a href="mailto:bhupendra_singh007@yahoo.co.in" title="mailto:bhupendra_singh007@yahoo.co.in">bhupendra_singh007 at yahoo.co.in</a>

Thanks & Regards,
Bhupendra Singh