I am not from a network tech background, but from a risk angle I wanted your expert view on this. We have an application that is hosted by a 3rd party. The application isnt public facing, you need to be logged into our domain to access the system. I am trying to determine how safe the transfer of data to and from this system is. All the 3rd party have said is there is a "standard WAN link" in place between us and them (i.e. their app/database server). What are the best practices for security on "WAN link's". Are they by default secure, or if not what security do you need to make the link safe?
Technically what is the "link" (hardware wise).
Please keep answers management freindly low tech.
I presume I also need to research what "protocols" are used for client access to the application? My very novice view was - presumably the actual WAN link needs to be secure if data sent from client to server (within the application) is using a plain text protocol. Whereas if the protocol used in the system is secure/encrypted - then whether the WAN link is secure or not - the data would be difficult to intercept by a hacker. Or am I miles off the mark?