NBN is the fastest broadband available in Australia. For most people, the NBN will replace your current broadband technology such as ADSL2 or cable internet. Once the NBN becomes available in your area, you will have approximately 18 months to switch before your existing phone and/or internet is disconnected. The NBN uses technologies such as fiber to the premesis, fiber to the node and wireless. You will be using one of these technologies depending on where abouts you live.