Some host universities (especially in parts of Europe, and the USA) will require you to have additional medical insurance coverage to comply with the host universities' requirements and/or visa requirements of that country. This requirement is outside of Swinburne's control and you will have to purchase the additional insurance if this is instructed by your host university.
Medical coverage does not count as full comprehensive travel insurance. Your Swinburne University insurance will be your main form of coverage for the full duration of your trip.
How do I know which policy to claim under?
Often the insurance from your host university will be medical insurance ONLY. This might mean that for things like simple trips to the doctor or basic prescription medicine you aren't charged a fee- or that it's much cheaper. In this case, it might be easier to use your host university insurance for basic medical needs.
However if this isn't the case, or if you encounter bigger medical needs- your Swinburne Chubb insurance is a fully comprehensive policy. You just need to be aware that you'll need to pay in full for the service upfront, keep all of your invoices/receipts and then make an insurance claim at a later date.
For full details on how the insurance from your host country/university works, make sure to ask your host university directly.