How many broadcast domains? Diagram Question CCNA

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– What is a broadcast domain? This tutorial answers what is a broadcast domain, and how to discern how many broadcast domains are in the network diagrams? The tutorial has diagram examples and answers. Cisco CCNA

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35 COMMENTS

  1. Wow! Why doesn't this vid have more views? I had to go through so many videos with convoluted explanations that were making no sense until I found this wonderfully simple and concise one. Thank you for taking the time to make this, I appreciate you!

  2. I have a question about the diagram which showed up at 5:57. Based on the definition, all ports on a hub or a switch are by default in the same broadcast domain. All ports on a router are in the different broadcast domains and routers don’t forward broadcasts from one broadcast domain to another. I feel there should be three broadcast domain in between the switch and three other routers instead of 1. Could you please explain this part a bit more?

  3. Simply putting:- broadcast and collision occurres only in LAN side not in WAN..now switch only Broadcast once to learn the macs from everyone port so it has one broadcast domain but it will send traffic only to the ports which are really in use so there will be same number of collision domain for each active port…where hub works in layer 1 …and has no memory so it sends the traffic to all ports including the source port so one broadcast and one collision because it has no memory it will send every packet to everyone.

  4. another question
    if you configure vlan on the switch ?
    like this question
    "A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?

    A. More collision domains will be created.
    B. IP address utilization will be more efficient.
    C. More bandwidth will be required than was needed previously.
    "D. An additional broadcast domain will be created.

    ?

  5. what about if we take the first picture were their was 2 switch only. If we assume we only look at 1 switch, etc to left: If you have a server and a client PC on 2 subnets and their interfaces is connected to the switch. Is it still 1 broadcast domain or 2 ?

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