Australian ethernet connections use an RJ45 plug, for which your laptop may need an adaptor. You should also check your laptop's voltage range.
It is unable to be switched to "240v", you will also need a voltage converter. An Australian three-pin plug is required to connect to local power supplies.
Additionally, there is a good network of wireless hotspots around Australia, a selection of local aircards available and countless internet cafes to access the internet whilst travelling across the country.