If a vlan is not configured on a switchport, it will fall under the default VLAN. The default VLAN is VLAN 1.
How to configure a default vlan
- Technically, you don't configure a default vlan
- VLAN 1 is the default vlan that comes on all Cisco switches and you can't change it
- This video will show you some best practices on how to control traffic on VLAN 1 and better lock down your switches
- shutdown unused ports
- create a blackhole vlan
- configure all unused ports as access ports in the blackhole vlan
- do not extend the blackhole vlan across trunk links
PacketTracer Lab: CCNA-2.4.b-How-to-configure-a-default-vlan.pkt
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