Which VLAN is commonly designated as VLAN 0 or 1?

The designation of VLAN 0 or 1 is commonly associated with the Default VLAN, which is also known as the Native VLAN. The Default VLAN is the VLAN that all ports are assigned to in a switch when they are first configured. This VLAN facilitates untagged traffic, meaning any frames that don't have a VLAN tag will be assigned to this VLAN for processing and routing.

In many Layer 2 switch configurations, VLAN 1 is used as the Default VLAN, and it is also the one that carries control traffic, such as Spanning Tree Protocol (STP) messages. This can be important for maintaining proper network functionality, as certain protocols and control traffic expect to be on this VLAN by default.

The other designations do not share the same widespread usage or significance in VLAN tagging and management. The Management VLAN is often used for administrative access to the network devices, but it is not necessarily VLAN 0 or 1. The Guest VLAN is typically set up to provide limited access for guest users but is not tied to the inherent purpose of VLAN 0 or 1. Finally, the Admin VLAN could be a term used in some specific environments but lacks formal designation or standard use compared to the Default VLAN or Native VLAN.

Understanding that the