Switches are configured with default ______ by manufacturers.

• A. VLAN 100
• B. VLAN 1
• C. VLAN 10
• D. VLAN 0

Answer: (B)

Switches start with a default VLAN that all untagged access ports belong to, and this default is VLAN 1 on many devices. When a switch boots, every port is in that VLAN unless you reassign it, so devices connected to new ports can communicate right away. This setup makes initial configuration simple: you can later carve out different networks by creating additional VLANs and assigning ports to them. In practice, admins often move management traffic to a separate management VLAN for security, but the factory default remains VLAN 1. The other numbers you see are just examples of other VLANs you might create, and VLAN 0 isn’t treated as a real data VLAN on modern switches—it’s tied to tagging concepts and native VLAN behavior rather than a standard user VLAN.