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configuring vlans

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VLans are created by a Vlan capable switch. The default on Vlan capable switches is that all ports belong to Vlan 1.

When you create a second VLan and assign ports to that VLan those ports only belong to that VLan. They can not communicate with the default VLan unles you have a router ["router on a stick"] that can route traffic from VLan 1 to Vlan 2.

Trunking is when you have mulitple VLANs spanning multiple switches and you need to have traffic span those multip Vlans on multiple switches.

now a switch port is its own collision domain. typically only 1 host connects to 1 switchport. The switch creates a table that says host A is on switch port 1 and all traffic desgined for host A only goes to switchport 1 unlike a hub which floods all ports with traffic hoping to find the right host.

Not sure what would happen if you turned on your traffic simulator that simulates 250 hosts on a 12 or 24 port switch but personally, I think it wouldn't tell you much.