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By default a switchport doesn't have a specified VLAN so it's on the native vlan, if the native vlan hasn't been changed that'll be vlan 1. Don't understand what the issue is. But, essentially the ports should be fine as access ports. What vlan you n...
Since, this was only provided a CLI option as an answer, for GUI go to the "help" on the upper right hand side of the GUI and click "about". You'll see the serial number there.
