What is the difference between a hub router and a premise router?

The distinction between a hub router and a premise router primarily relates to their functions and contexts in networking, particularly when considering how they interact within larger systems like the Defense Information Systems Network (DISN).

The correct choice emphasizes that a hub router is interconnected via networks such as the Defense Information Systems Agency (DISA) Asynchronous Transfer Mode (ATM) network. This highlights the role of hub routers in facilitating communication within a wide area network (WAN) framework, allowing routing and management of network traffic between various locations and nodes.

In contrast, premise routers typically serve as local devices that manage service delivery within a specific physical location, such as an office or building. They are not designed for the same level of inter-connection across a wide area network like hub routers. This means that while both types of routers play critical roles in network infrastructure, their applications and the scale at which they operate differ significantly.

Therefore, this understanding of interconnectivity via ATM networks encapsulates why this option reflects an accurate differentiation.