The NIC card is found near the USB port. If NIC is a separate card, it could be on the computer back with a PCI slot. The address range can be found with RAM start address. The common address range starts with D8000.
When the system is connected and light is on, it indicates active connection. If not, it can indicate a failure or that err in the port is disabled. The problem can be solved by checking the configuration and ARP cache. The issue could be with VLAN as well. One needs to check if the connection on VLAN exists for the system.
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