Which VLANs are auto-created and cannot be deleted?

VLAN 1 and the VLANs in the range of 1002 to 1005 are indeed auto-created by Cisco switches and are part of the default VLAN configuration. VLAN 1 is the default management VLAN on Cisco devices and serves as a control path for numerous protocols. It cannot be deleted because it is used for management purposes and essential network functions.

The VLANs in the range of 1002 to 1005 are also reserved for specific use cases, including Token Ring and FDDI networks, and they cannot be deleted, as they have been designated for compatibility with older technologies. This restriction helps maintain a stable network environment and ensures that protocols relying on these VLANs can function properly.

While VLAN 1 is universally recognized as the default VLAN, the additional VLANs (1002 - 1005) have historical relevance, particularly related to token-based networking and compatibility scenarios within integrated switching environments. Thus, the inclusion of these specific VLANs in the correct answer reflects both their predefined roles and the limitations on modifying the default VLAN configurations in Cisco devices.