C$-$ As the Network Security Administrator for a multinational corporation, yo$$ve recently identified a potential vulnerability related to VLAN hopping and switch spoofing in the company's network infrastructure. VLAN hopping allows traffic from one VLAN to be visible to another, with switch spoofing exploiting incorrectly configured trunk ports to facilitate this attack. Your task is to address this security concern and fortify the network against such threats.

$(3$ marks$)$