What are the different categories of routers, and how do they compare?

What will be an ideal response?

ANSWER: Some of the different categories of routers are as follows:
* Core routers, also called interior routers, are located inside networks within the same autonomous system. An AS (autonomous system) is a group of networks, often on the same domain, that are operated by the same organization. An AS is sometimes referred to as a trusted network because the entire domain is under the organization's control. Core routers communicate only with routers within the same AS.
* Edge routers, or border routers, connect an autonomous system with an outside network, also called an untrusted network. For example, the router that connects a business with its ISP is an edge router.
* Exterior router refers to any router outside the organization's AS, such as a router on the Internet backbone. Sometimes a technician might refer to her own edge router as an exterior router because it communicates with routers outside the AS. But keep in mind that every router communicating over the Internet is an edge router for some organization's AS, even if that organization is a large telecommunications company managing a portion of the Internet backbone.