The described symptoms suggest that an unauthorized entity is cloning the hardware identifiers of authorized devices to access network resources, which is known as identity impersonation at the hardware level. This leads to discrepancies in the network switch's address tables and can cause legitimate devices to lose connectivity when their identifiers are used illegitimately. While a signal jammer could indeed disrupt network connectivity, it would not cause alternating identifiers between ports. DHCP exhaustion is a situation where all IPs from a DHCP pool are used up, which would not lead to alternating identifiers between different network ports. Finally, a Broadcast storm could cause network slowdowns or outages, but again, it would not lead to the specific pattern of changing hardware addresses seen in the switch logs.