What is router?

A router is a networking device that forwards data packets between computer networks. A data packet is typically forwarded from one router to another router through the networks that constitute an internetwork until it reaches its destination node.

Function of Router:

Packet forwarding: Packetsare transferred between a source interface and a destination interface, usually on two different systems

Packet switching:

• Internetwork connection
• Packet filtering
• Path selection

Type of Router: 

Router is available in two type non-modular and modular.

1.Non-modular routers are low cost routers with fixed interface or cards. If we want to add ports or interfaces later on we cannot add them.

2.Modular routers are those routers which can extend with certain component, such as interfaces or ports. Hence we can add interface cards later on.

Rules to configure Router:

Router and switches support to types of external connection:

1.Ports:

Ports are used for configuration purpose and provide an out-of-bond management method that is managing purpose without affecting traffic flowing through devices.

2.Interface

Interface are used to connect devices together like switch to router, router to router, PC to router.

Interface can be used for management purpose but it will affect the performance of the device.

You can access and configure a device in many ways including the following:

• Console port
• AUX port
• Telnet
• SSH
• Web browser
• SNMP management station.