You can set up multiple network connectors. For instance, you might want to set one up on a testing server before deploying it to the live server. In this case, you would need to disable the test one when you want to move to the live one.
If you want to use multiple connectors at the same time for High Availability or to connect to multiple clouds you will need to set up the appropriate routes in the advance network settings. Please read the following FAQs for more details.