Which Cisco IOS command is used to create a new VLAN on a switch?

To create a new VLAN on a Cisco switch, the command utilized is "vlan [vlan-id]". This command places you in VLAN configuration mode, allowing you to define the properties and settings for the new VLAN identified by the specified VLAN ID. This syntax is consistent across many versions of Cisco's IOS, making it a fundamental command for network administrators when setting up VLANs.

The other commands suggested do not align with Cisco IOS syntax. For instance, "vlan create vlan-id" and "create vlan vlan-id" imply a different structure that is not recognized by the IOS commands. In addition, "vlan add vlan-id" does not exist as a command within the IOS command-line interface; rather, you initiate a VLAN by directly entering the VLAN ID after the "vlan" command. Hence, understanding that the correct form "vlan [vlan-id]" is essential for successful VLAN configuration on Cisco switches.