How many broadcast domains are created if three hosts are connected to a Layer 2 switch in full-duplex mode?

How many broadcast domains are created if three hosts are connected to a Layer 2 switch in full-duplex mode?
A. 4
B. 3
C. None
D. 1

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4 thoughts on “How many broadcast domains are created if three hosts are connected to a Layer 2 switch in full-duplex mode?

  1. You are confused between Collision Domain and Broadcast Domain – Answer D is correct. Router can create Broadcast domain.
    In the above case, 3 collision domain have been created.

  2. VLAN is considered as a broadcast domain. The switch, having the VLAN 1 as default, means that all end devices that are connected to the switch would belong to the default broadcast domain.

  3. I am going to disagree with this one. When you take a switch out of the box, it is configured with VLAN 1. You do not create VLAN 1 it is there.
    When I plug-in 3 new PCs into the Switch, by default they are members of VLAN 1 = Same Broadcast domain. So no new Broadcast domain is created. That is why I think the answer is C.

    If we created another VLAN – SWITCH(Config)# VLAN #
    then we use interface Fa0/x
    Switchport mode access
    Switchport Access VLAN X

    now we have created a new VLAN and then added that Switchport to that VLAN. This creates a NEW BROADCAST Domain

    So I think this Question is Horrible. The Answer is C – none.

    1. In this question they did not says actual vlan or include a router so we assume its vlan1 so its 1 broadcast domain as default, unless you assign one port in separate vlan. You called it native vlan is the untagged vlan on an 802.1q trunked switchport. definitely the answer is D.

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