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hi... i am a beginner to CCNA... i find it hard understandin
collision domain n broadcast domain.. please don tell me the
definition.. i read the definitions many times... i need a
more detailed explanation... like whn i read the definition
it sounds simple... but i don understand whn they say it
like a hub has one collision domain and one broadcast
domain... and if collisions happen inside collision
domain... i am confused... please help me... :(
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Answer Posted / jitendera sinha
ok i am trying here
to understand it you have to see the hub structure let i am
taking 8 port hub od dlink ok?
now as structre of hub there is simple back bone like wire
which carry all the data.that is
____________________________________________________
| |
| |
port 1 port 8
no this is the simple pictrial digarm of hub
now what happen if the data flow accross the hub.
scince you know that hub act on lower layer that is
phycisal layer so it simply flood the data across the
network suppose we want to send some data at
192.168.100.255 it is conected through 8 port then hub
simply flodded the data at each and every port
thus we can say that hub have the single broadcast domain.
now coolison domain
from above disscussion we can say that only one user can
send that data at the same time no any user can send the
data in that same time
if two user send the data in same time what will hapeen
trafic is congusted and you get the page that "some
erreor:network is bussy"this is called coolison so you have
to send the data again.
thus form this diffination we can say that hub has single
collison doamin.for that draw back we devlped a new hub in
which we allocate the data a time satamp according to
priorty in such a amanner that if coolision occurs it will
wait for the time in which the dat can be transfred and
this data is kept in the buffer some time it is refred as
switch but it is not fully switch you can say it partialy
switch
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