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3.1.2. Default VLAN

VLAN 1 is the default VLAN on all Cisco switches:

  • All ports are in VLAN 1 by default
  • Control traffic (CDP, VTP, STP BPDUs) uses VLAN 1 by default
  • Best practice: Don't use VLAN 1 for user traffic; create separate VLANs

⚠️ Exam Trap: You cannot delete VLAN 1, but you can (and should) move user traffic to other VLANs.