What is the difference Broadcast domain and collision domain?

I know and read what is collision domain and broadcast domain, please explain to me what is the difference broadcast domain and collisions , for example what is the switch port is called the domain of collisions ? why ,and switch which supports VLAN is called a broadcast domain ?
3 answers
April 7th 20 at 15:32
Broadcast (and better in Russian: broadcast) domain L3 (though L2 is also for ARP requests).
Collision domain at level L1, and it lost its relevance since, as hubs was supplanted by switches.
L1 is a physics environment
conflict - this is about physics. When two devices at the same time is trying to take the physical environment is conflict.

By the way, I remember! No, not lost its relevance, because there is Wi-Fi, and there live in common, and closest to the concept of collision domain, IMHO, will be a separate Wi-Fi channel. - jeanie.Gleason commented on April 7th 20 at 15:38
Rather, L2 vs L3, L1 - a physics environment and then closer - how to divide L3 to L2.
lost its relevance

Yes. The presence of a Vlan is losing relevance, but you have to keep in mind. ))) - Dovie.OKon68 commented on April 7th 20 at 15:35
@myrtis8, not really ...
There is a conflict "Physics", but .... L2-if you put two DHCP (IPv4) to a network or a loop will create (ARP) - this is a conflict, BUT this conflict is different.
all nodes which compete for the shared transmission medium and therefore each node which can create a conflict with any other node of this part of the network.
. I, in his understanding, understand this:
1) L1 - Wednesday - cable, L2 - Ethernet (RJ-45 <-> switch)
2) I Have two nodes have ip address is, but belong to two independent domains (networks) separated VLAN-mi, the collision between two identical ip addresses. Of course they have a common environment - Ethernet. Only a smart switch that will digest, but tension available. - Dovie.OKon68 commented on April 7th 20 at 15:41
L1 - Wednesday - cable, L2 - Ethernet
L1 - Wednesday - cable, Ethernet, L2 - MAC addresses and the ARP Protocol

Well, Ok, let it be so: collision domain at the junction of L1 and L2. - jeanie.Gleason commented on April 7th 20 at 15:44
April 7th 20 at 15:34
Never used for the experiment - do not give )))
As I understand it.
What's stopping you on the switch on Vlan-Ah to make 2 network and Look at the netmask. Is the intersection. BUT one network belongs to one domain and the other another.
If you try easier, you have domains, but they belong to the same data link layer (PPP, IEEE 802.22, DSL, Ethernet and ARP), those are on the same network and the question of which domain owns the IP there is no unambiguous answer.
Broadcast with interesting, on a Vlan you can restrict the signal to those on each Vlan to make its DHCP (not allowed to do - can bring down a network ))) ). The broadcast will not go where they shouldn't (should not).
On Vlan-you can share the network at the second level of the network model (roughly).
April 7th 20 at 15:36
The actual titles all clear.
Stream, the type of traffic which is transmitted of course to all recipients in a particular environment.
Conflict is the effect when multiple sources transmit at the same data transfer(for example a wire which is used as a bus hub), thus there is a damage of packages.

For example , if three devices are connected via hub, and will generate a traffic stream, then it will be one domain of collisions and broadcast. Because a hub is a repeater, and packages "can run into each other", and one domain broadcast because the packets generated by the source stream packets are received by all devices.

But if we change the schema. Instead of a hub will supply the switch. There will be different domains. Packages so all will be delivered, but they will be faced(to create conflict).

Find more questions by tags Network administrationComputer networksSystem administration