what device is the DHCP server (Windows server, the 2960...etc.)?
Where onthe network in relation to the 2960 is the DHCP server located?
If the DHCP server is the 2960 you need to create a DHCP pool for addresses that will be leased out.
If the DHCP server is on another network then you may have to issue the ip helper-address command on the router to forward DHCP requests.
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