Flat Network Topology
- If the destination is the broadcast MAC FF-FF-FF-FF-FF-FF OR if the destination is an unknown unicast
- Switch sends the frame out all ports except the one it came in on
- All users connected to switch in same broadcast domain
- Too much broadcast traffic doesn't scale well
- Hard to implement policy
- In the scenario where you have one big subnet (1 VLAN)
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The Need For Virtual LANs
- Configure VLANs on managed switches
- CLI
- GUI
- Through a web browser or mobile applications
- Segment networks at Layer 2
- Create VLANs and assign VLANs to ports
- If you have 24 ports on your switch, you can say:
- Ports 1-12 will be on VLAN 10
- Ports 13-24 will be on VLAN 20
- Each VLAN is gonna be a new subnet.
- Each VLAN is a separate broadcast domain.
- One physical switch acts as multiple logical switches
- One VLAN for each subnet
- Not true always bot for the most part this is the case.
- Routing between VLANs requires Layer 3
- Has to go through a firewall.
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- Broadcast is only flooded out of a port that is in the same VLAN.