4-4DuraLAN Fast Ethernet NICs User’s GuideDual HubsIn this example, each NIC is connected to a separate hub to provideredundancy. If the hub port being used by the primary NIC fails, thebackup NIC becomes active and all network traffic is immediatelydirected through it.Figure 4-3. Two NICs connected to separate hubsPrimaryBackupEthernet HubClientsClientsEthernet HubServer