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Home > Archive > alt.certification.cisco > April 2004 > Need info about Layer 2 switch on a segmented LAN
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Need info about Layer 2 switch on a segmented LAN
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| Hello ,
I would like to know what is obtained when segmenting a LAN with a layer
2 switch . From what I have read in the chapter 2 of semester 3 (ccna)
, it is not very accurate (in one way it is said there is less collision
domains, in another way it is said it separates collision domains ,so I
am getting a bit confused about it)
For myself, I would tend to say that it creates less collision domains
but a friend of mine told me it creates more collision domains.
So, I would like to know what is the best answer regarding this subject
and also some detailed explanations would be welcome, thanks.
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| Fusion 2004-04-23, 8:24 am |
| It creates more collision domains which is good. Remember, the more
you have the less PC's per domain hence less chance of collision.
IE: If you have 10 PC's connected via 1 hub you have 1 collision
domain. IF you remove the hub and add the switch, you have 10
collision domains as a switch segments every port. This gives all 10
pc's full bandwidth.
I hope this helps.
On Fri, 23 Apr 2004 12:21:37 +0200, Nic <no@spam.-> wrote:
>Hello ,
>
>I would like to know what is obtained when segmenting a LAN with a layer
>2 switch . From what I have read in the chapter 2 of semester 3 (ccna)
>, it is not very accurate (in one way it is said there is less collision
>domains, in another way it is said it separates collision domains ,so I
>am getting a bit confused about it)
>
>For myself, I would tend to say that it creates less collision domains
>but a friend of mine told me it creates more collision domains.
>So, I would like to know what is the best answer regarding this subject
>and also some detailed explanations would be welcome, thanks.
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| In article < k1vh8050i063468ueh8lc1hh40ub82
4j96@4ax.com>, hey@yaright.com
says...
> It creates more collision domains which is good. Remember, the more
> you have the less PC's per domain hence less chance of collision.
>
> IE: If you have 10 PC's connected via 1 hub you have 1 collision
> domain. IF you remove the hub and add the switch, you have 10
> collision domains as a switch segments every port. This gives all 10
> pc's full bandwidth.
>
> I hope this helps.
Ok I understand better now, thanks for the information
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| Michael 2004-04-23, 11:25 pm |
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"Nic" <no@spam.-> wrote in message
news:MPG.1af30c9e9f088c549896ab@news.free.fr...
> Hello ,
>
> I would like to know what is obtained when segmenting a LAN with a layer
> 2 switch . From what I have read in the chapter 2 of semester 3 (ccna)
> , it is not very accurate (in one way it is said there is less collision
> domains, in another way it is said it separates collision domains ,so I
> am getting a bit confused about it)
What you probably read is that with switches you get less collisions, not
less collision domains. Another way to say it is that you get more
collision domains, which result in less collsions.
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| Hansang Bae 2004-04-24, 3:25 pm |
| In article <MPG.1af30c9e9f088c549896ab@news.free.fr>, no@spam.- says...
> I would like to know what is obtained when segmenting a LAN with a layer
> 2 switch . From what I have read in the chapter 2 of semester 3 (ccna)
> , it is not very accurate (in one way it is said there is less collision
> domains, in another way it is said it separates collision domains ,so I
> am getting a bit confused about it)
>
> For myself, I would tend to say that it creates less collision domains
> but a friend of mine told me it creates more collision domains.
> So, I would like to know what is the best answer regarding this subject
> and also some detailed explanations would be welcome, thanks.
First and foremost. Collisions don't mean a thing. Collision is how
Ethernet (in CSMA/CD) works.
Depending on your definition of "domains" the answer can be different.
Each port on a switch is its own collision domain. Therefore, one could
argue that switches increase the number of collision domains. But
within each domain, it reduces the number of devices that can generate a
collision. I.e there is only one PC per domain now.
In a shared hub environment, anyone on the hub shares the collision
domain.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
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