What is the default VLAN?

The default VLAN on a network switch is VLAN 1, which is automatically assigned to all switch ports when they are first configured. This VLAN is used for management and control traffic within the switch. It's important to note that using VLAN 1 for user data traffic can create security vulnerabilities, so best practices recommend changing the default VLAN and using separate VLANs for different types of traffic.