Which VLAN range is reserved and cannot be used?

The range of VLANs that is reserved and cannot be used includes VLAN ID 0 and VLAN IDs from 1006 to 4094. Specifically, VLAN ID 0 is used to indicate that no VLAN ID should be assigned, while VLAN IDs from 1006 to 4095 are reserved for future use or specific purposes, including management and protocol-specific requirements.

Understanding the VLAN numbering is important, as the valid range of VLANs that can be configured or assigned for regular use in a network spans from 1 to 4094. However, only VLAN IDs from 1 to 1005 are typically used for normal operational purposes in standard Ethernet networks. As such, any mention of using VLAN IDs beyond these limits (specifically between 1006 and 4094 in this case) would not apply to standard VLAN setups.

Thus, the correct answer clearly identifies the total range that cannot be directly assigned to VLANs in typical network configurations, focusing more broadly on the entire spectrum where reserved identifiers exist.