Hi
Please correct me If im wrong, you want to connect to DSL modem to the port 24 on your Cisco 2960x an assign a vlan to it right?
Also get Internet access through that connection, is that correct? well first at all, verify if you switch can run a NAT and routing, you can check this configuring:
conf t
ip routing
and for the NAT
try to configure just for testing purposes:
interface vlan 1
ip nat inside
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