mac layer function in switched etherner

Answered Question
Jan 27th, 2009

Hi every bodY

In If hosts are connected using ethernet via hub, mac layer on each host determines when host can or can not send data.

But in switched ethernet where host are connected to switchport and there is no contention as to who access the medium first, Do we need mac lyer in switched ethernet? if yes what purpose will it serve?

thanks a lot!

I have this problem too.
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Correct Answer by Giuseppe Larosa about 7 years 10 months ago

Hello Jon, Sarah

in a switched environment we don't need MAC as media access control, but we still use the MAC addresses as a way to reach NICs in a vlan.

So we cannot remove the MAC layer it is still used.

Hope to help

Giuseppe

Correct Answer by Jon Marshall about 7 years 10 months ago

Sarah

You still need it if the link is not full duplex because there is still the possibility of a collision but if it is running full duplex then technically no you don't need the mac layer.

Jon

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Correct Answer
Jon Marshall Tue, 01/27/2009 - 10:32

Sarah

You still need it if the link is not full duplex because there is still the possibility of a collision but if it is running full duplex then technically no you don't need the mac layer.

Jon

Correct Answer
Giuseppe Larosa Tue, 01/27/2009 - 10:58

Hello Jon, Sarah

in a switched environment we don't need MAC as media access control, but we still use the MAC addresses as a way to reach NICs in a vlan.

So we cannot remove the MAC layer it is still used.

Hope to help

Giuseppe

Jon Marshall Tue, 01/27/2009 - 11:02

Giuseppe

Sorry, i was talking purely about the CSMA/CD part of the mac-layer. I was probably being a bit literal !!

Jon

Giuseppe Larosa Tue, 01/27/2009 - 11:06

Hello Jon,

that was clear to me.

By the way

My compliments for your 10000 points in netpro !

and for the new "first dan" badge

Best Regards

Giuseppe

Jon Marshall Tue, 01/27/2009 - 11:11

Giuseppe

Many thanks. I fully expect to see you joining me, and if you carry on the way you are now, it won't be too far in the future.

Jon

sarahr202 Tue, 01/27/2009 - 14:27

thanks Jon and Giuseppe!

As for the 10000 points Jon, congratulations ! But be advised I am getting started as well :-)

Jon Marshall Tue, 01/27/2009 - 14:30

Sarah

Many thanks.

"But be advised I am getting started as well :-)"

I noticed and i wish it wasn't in LAN Routing and Switching. Could you not specialise in something that me & Giuseppe dont such as IP telephony :-).

Seriously, you are more than welcome Sarah, good to have you in this forum.

Jon

sarahr202 Tue, 01/27/2009 - 14:36

you guys are the best teachers. This is my wish to help someone like myself the way you guys help me every day!

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