Types of Router

Router provide connectivity inside enterprises and the internet, and within on internet service provider(ISP).
 One of the larges routers exemple the Cisco CRS-1 or Juniper T 1600 interconnect internet service provider (ISP), They arte used within ISPs, or may  be used in very large enterprises networks.  The smallest router provide connectivity for small and home office.

EDGE COMPUTER- The type of router are placed at the edge of the ISP network, the are noremaly configured tro external protocol protocol like BGP (Border gateway proocol) to another BGP of other ISP

or large organisation.

SUBSCRIBER EDGE ROUTER-  The type of router belongs to an end user (enterprises) organization. Its configured to broadcast external BGP to its provider's ASes.

INTER-PROVIDER BORDER ROUTER-  This type of router  is for inter connecting ISPs.  This is a BGP speaking router that maintains BGP sessions wih other BGP speaking routers i n other provider ASes.

CORE ROUTER-  A router that resides within the midle or backbone of the LAN network rather then at its  periphery.

In same instance a core router provides a stepdown backbone inerconnecting the distribution routers from multiple building of a campus(LAN) or large inerprises location (WAN).  They tend o be optimized for a high bandwidth

What is router

A router is a networking device that forwards data from one network to another. This include residential routers that also use Network Address Translation.

                                                             or

This is a hardware device that routes data (hence the name) from a local area network (LAN) to another network connection. A router acts like a coin sorting machine, allowing only authorized machines to connect to other computer systems. Most routers also keep log files about the local network activity.