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Hi @junwoopark
If you are thinking of connecting devices via WiFi, then you need a router or a modem/router, depending on the type of service you'll apply.
If you'll get the NBN bundled with VoIP service, then you need a modem/router that can be configured with VLAN ID 2.
If it's a data only plan, then you can purchase either of them as you are not required to set the VLAN ID.
BasilDV
Hi @junwoopark
Yes, you need to purchase a router or a modem/router as the NBN NTD box (ARRIS), will not give you a WiFi connection.
BasilDV