As @marce1000 suggests it depends on how the wall port is configured. There are some options such as bpduguard which would recognize that a switch was being connected and would shut down the wall port and the unmanaged switch would not work. It is possible that no feature like that is configured and that the unmanaged switch would become part of the network, and all ports on the unmanaged switch would operate as part of the user vlan.
HTH
Rick
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