collision and broadcast domain

localboyy

Hello everybody

I have a question about collision and broadcast domains
http://i54.tinypic.com/2im3n08.jpg

How many collision and how many broadcast domains are on picture?
2 broadcast and 9 collision domains?

Best regards,

Willaynto

[EMAIL="http://img33.imageshack.us/i/2im3n08.jpg/"]http://img33.imageshack.us/i/2im3n08.jpg/[/EMAIL]

2 broadcast and 7 coallison

localboyy

localboyy wrote: »

Hello everybody

I have a question about collision and broadcast domains
http://i54.tinypic.com/2im3n08.jpg

How many collision and how many broadcast domains are on picture?
2 broadcast and 9 collision domains?

Best regards,

Are you 100% sure ?

Thanks

dirtyharry

Willaynto wrote: »

http://img33.imageshack.us/i/2im3n08.jpg/

2 broadcast and 7 coallison

this. each switch port is a collision domain by itself. the hub counts as one. so, count each switch port being used by PCs and router. Add this to the one for the hub (6+1=7). But maybe we should count each switch port whether it's being used or not? idk.

The router stops broadcasts from going back and forth between the LANs and makes two broadcast domains -one on each side.

localboyy

Same question

http://i1080.photobucket.com/albums/j332/_maker/ScreenShot014.jpg

I got it how routers, switches and hubs make collision/broadcast domains. But what about bridge?

Can someone tell me how many collision and how many broadcast domains are on the picture and explain it a bit, please?
I think it's 2 broadcast and 11 collision domains but not sure.


P.S
another question,
http://i1080.photobucket.com/albums/j332/_maker/howmanynetworks.jpg

how many networks are there on the picture?
Best regards,

Monkerz

I sure hope this is not your homework...

localboyy

Monkerz wrote: »

I sure hope this is not your homework...

It isn't

SteveO86

localboyy wrote: »

Same question

http://i1080.photobucket.com/albums/j332/_maker/ScreenShot014.jpg

I got it how routers, switches and hubs make collision/broadcast domains. But what about bridge?

Can someone tell me how many collision and how many broadcast domains are on the picture and explain it a bit, please?
I think it's 2 broadcast and 11 collision domains but not sure.


P.S
another question,
http://i1080.photobucket.com/albums/j332/_maker/howmanynetworks.jpg

how many networks are there on the picture?
Best regards,

Routers (At layer 3 of the OSI Model) create broadcast domain (Because broadcast are not forwarded by default. A broadcast will commonly be ARP requests or DHCP requests, or many other things), so if you have 1 router connected to 2 networks you have 2 broadcast domains.

Collisions domains are at layer 2 of the OSI model.

A collision is when 2 networked devices attempt to transmit data at the same time using the same medium, such as when a device is connected to a hub (shared medium) or a wireless AP, devices must first listen for other data being transmitted if it doesn't hear anything it transmits (sometimes that doesn't work and we have collisions, data gets corrupt and both devices back off for a random amount of time).

Every port on a switch/bridge is it's own collision domain. So if I have a single switch connected to 7 PC's I have 7 collision domains.

Bridge are essentially the same thing as a switch. Switches just have more physical interfaces.

If I have 1 Switch, 5 PC's, 1 router I have 6 Collision domains (One for each PC, and another for the link to the router) and 1 broadcast domain. (because it is one network.)

Checking out CSMA/CD (Wired LAN) for CSMA/CA (WLAN), may provide addition details that may help you.

localboyy

Thank you for detailed explanation and advice! I was just wondering about the bridge
So, it's 2 broadcast and 11 collision domains ?


What about other picture?

SteveO86

localboyy wrote: »

Thank you for detailed explanation and advice!

No problem.

localboyy wrote: »

I was just wondering about the bridge

SteveO86 wrote: »

Bridge are essentially the same thing as a switch. Switches just have more physical interfaces.

Same as a switch they work at layer 2 so the provide addition collision domains. They will forward broadcasts so they do not create broadcast domains.

localboyy wrote: »

So, it's 2 broadcast and 11 collision domains ?

Correct.

localboyy wrote: »

What about other picture?

Not to sound mean but you tell what's in the that picture. (Practice makes perfect and it looks like you a good grasp on the concept already.) Trust me the more you do this the easier it will be.

groxer

Finally got the collision and broadcast. But what about this ?
http://i1080.photobucket.com/albums/j332/_maker/howmanynetworks.jpg
It's 4 networks?

okplaya

groxer wrote: »

Finally got the collision and broadcast. But what about this ?
http://i1080.photobucket.com/albums/j332/_maker/howmanynetworks.jpg
It's 4 networks?

Yes.

A typical address scheme for that kind of network is two /30's for the Serial links and a /24 for each LAN.

groxer

okplaya wrote: »

Yes.

A typical address scheme for that kind of network is two /30's for the Serial links and a /24 for each LAN.

Thanks!
Do you maybe know where could I find examples like this ? This is from CISCO or?

okplaya

For free, not really sure off hand. You could google "ccent practice exam" maybe?

If you are studying for ccent/ccna then the official certification guide has a bunch of information to help you understand these concepts. In addition, there is a practice test to further reinforce these sorts of concepts.

groxer

okplaya wrote: »

For free, not really sure off hand. You could google "ccent practice exam" maybe?

If you are studying for ccent/ccna then the official certification guide has a bunch of information to help you understand these concepts. In addition, there is a practice test to further reinforce these sorts of concepts.

I am not, but my buddy is :S
At which chapter or exact part of CCNA could it be found ? This thing with collision and broadcast domains, and networks

okplaya

Not really sure. I'd imagine it will be in the first several chapters.

Oh, a good resource for training that hardly gets mentioned is youtube. You can find a wealth of tutorials on there.