Table of Contents
What Is A Router
What Is A 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
Cisco router is available in two types non-modular and modular.
Non-modular routers are low-cost routers with fixed interfaces or cards. If we want to add ports or interfaces later on we cannot add them,
Modular routers are those routers that can extend with certain components, such as interfaces or ports. Hence we can add interface cards later on,
Rules to configure Router: Cisco router and switches support two types of external connection: Port and Interface.
Ports are used for configuration purposes and provide an out-of-band management method that is managing purpose without affecting traffic flowing through Cisco devices.
The interface is used to connect devices together like the switch to router, router to router, PC to the router.
The interface can be used for management purposes but it will affect the performance of the device.
You can access and configure a Cisco device in many ways including the following:
Console port
AUX port (only certain cisco products)
telnet
SSH
Web browser
SNMP management station.
The Cisco IOS is a Cisco proprietary software that is used on Cisco routers and switches. The IOS is the kernel of Cisco routers and most switches. A kernel is the basic, indispensable part of an OS that allocates resources and manages things such as low-level hardware interface and security. At first, IOS was developed by William Yeager in 1986, to provide network services and enable networked applications.
Cisco router IOS software is responsible for
· Supporting and transferring network protocols.
· Adding security to strictly control access to network and networking devices to stop unauthorized access.
· Providing scalability for ease of network growth.
· Providing network reliability to ensure that resources are always available and reachable.
Cisco router: Cisco routers are internetworking devices used to connect different distinct networks. Cisco router is available in two types non-modular and modular.
Non-modular routers are low-cost routers with fixed interfaces or cards. If we want to add ports or interfaces later on we cannot add them,
Modular routers are those routers that can extend with certain components, such as interfaces or ports. Hence we can add interface cards later on,
Cisco routers support two types of connections such as ports and interfaces.
Ports are used for configuration purposes and provide an out-of-band management method that is managing purpose without affecting traffic flowing through Cisco devices.
Interface are used to connect devices together like the switch to router, router to router, PC to the router.
The interface can be used for management purposes but it will affect the performance of the device.
You can access the Cisco from the console port of a router, from a modem into the auxiliary or AUX port, or even through Telnet. Access to the IOScommand line is called an EXEC session.
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