A department decides to replace its hub with a Catalyst 2950 Switch that is no longer needed by another department.To prepare the Switch for installation,The network aministrator hao erase the startup-configuration and reload the Switch.However,PCs that are connected to the Switch experience various connectivity problems.What possible cause of the problem?
A.The vlan datebase was not erased.
B.The management Vlan is disabled.
C.The running-configuration should have been erased.
D.The "mode" button was not pressed when the switch was reload.
E.The Switch was no configured with an IP address or a default-gateway.
答案是选A,想知道为什么,请各位解释下。谢谢!