Well it depends on whether it is a layer 2 or layer 3 switch :)
If it is layer 3 and it is meant to be doing inter-vlan routing i agree without IP config of some sort it's not a lot of use.
But if it is a layer 2 switch or a layer 3 switch acting as a layer 2 switch then the IP configuration is only needed for managing the switch itself. Without an IP config you can still have multiple L2 vlans and clients/servers/printers etc. connected into the ports and it will do it's job.
No. A switch working at layer 2 would not require VLAN interfaces and thus would not have IP addresses assigned to these.
A switch working at layer 2 would have VLAN's configured and the relevant ports assigned to the desired VLAN.
Routing would happen by the switch being uplinked to a router via a trunk link, thus traffic for all VLAN's would traverse the trunk to the router. The router would then pass the traffic back down the trunk destined for the required VLAN, where the switch would switch it to the correct port on the VLAN or all ports on the VLAN, depending on whether there was an entry in the CAM table for the MAC of the destination host.
However a switch with no IP addresses configured would require local administration (via the console). For remote adminstration an IP addresses would be assigned to a VLAN interface and this would then be advertised via CDP.
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