Which of these is a VLAN that exists in the VLAN database and cannot be deleted?
- default VLAN 1
- Native VLAN 99
- Voice VLAN 20
- default VLAN 99
Explanation: When a Cisco Catalyst switch is first powered on, certain VLANs are automatically created in the VLAN database (stored as the vlan.dat file in flash memory). These include VLAN 1, which is the factory default VLAN, as well as VLANs 1002 through 1005, which are reserved for Token Ring and FDDI.
The sources explicitly state that these specific VLAN IDs (1 and 1002 to 1005) cannot be removed from the database. While other VLANs like a Native VLAN 99 or a Voice VLAN 20 can be manually created and deleted by an administrator using the vlan or no vlan commands, VLAN 1 must always exist as it is the default membership for all ports until they are reassigned.
Related exam: Modules 1 – 7: Checkpoint Exam: Network Switching Answers (CCNP ENCOR v9)
