Monday 27 June 2011

What is Router? Advantges? and Configuration Modes?

Router
It’s a layer 3 device that connects 2 different networks and routes packets of data from one network to another. It breaks up Broadcast domain as well as Collision Domain.

Advantages of Router
1.Router don’t forward Broadcasts by default.
2.Perform access control on the traffic that flows through the router i.e. Packet Filtering.
3.Network Address Translation.
4.Quality of Service for particular network traffic.
5.Can be used as a DHCP relay agent.
7.Connects different VLAN’s.

Different Modes for configuring a router
1.User Mode- some basic commands like ping, telnet can be done. Prompt will be Router >
2.Execution or Privilege or Enable Mode- can view all configuration details, minimal commands like ping, telnet, and clock setting. Prompt will be Router #
3.Global Configuration Mode- where all configurations are done. Prompt will be Router(config)#


Sub Configuration Modes
1.Interface configuration mode, prompt will be Router(config-if)#
2.Router configuration mode, prompt will be Router(config-router)#
3.Line configuration mode, prompt will be Router(config-line)#

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