In most switches, what is the default VLAN?

The default VLAN in most switches is VLAN 1. This is the predefined management VLAN that switches use for various control and management protocols, such as spanning tree protocol and management traffic. Being the default, it is automatically assigned to all switch ports unless specifically configured otherwise.

Using VLAN 1 allows for easier initial setup and management of switches because it provides a common communication layer across all devices in the same network environment. Administrators often utilize this VLAN for accessing switch management features, making it an essential part of basic network setup.

While other VLANs, such as VLAN 2, VLAN 100, and VLAN 5, can be created and configured for specific purposes or segmentation within a network, they do not serve the same fundamental role as VLAN 1. These alternative VLANs may be used for organizational, departmental, or traffic management purposes but are not designated as the default on most switches.