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Basics of Router

Hi all,

Today we will see about basics of router, later will discuss in detailed about it.

 Router :

   The Router is to route the traffic or data from one geographical area or network to another geographical are or network.

 It involves two basic activities:

 1. Determining optional routing paths.

 2. Transporting information groups through an internetwork.

 It has several components

 DRAM, NVRAM,Flash,ROM,console,auxilliary and interfaces.

 ROM

 Random access memory (ROM),it is used to store routers bootstrap startup program, operating system software, and test programs.

 It has several components in router

 1. POST (Power on self test)

 Whenever the router is switched ON, a self test is made with all physical interfaces, and also provides information about the status whether ON or OFF.

 2. BSL (Boot strap loader)

   The booting will be decided whether to boot from normal mode or ROMMON mode.

 3.  MINI IOS 

 A minimum or duplicate copy of a CISCO IOS is used to configure router.

 Flash Memory

 It is erasable, reprogrammable ROM.flash content is retained when you switch OFF or restart the router.

 4. DRAM

 Dynamic RAM is used to store operational information such as routing tables, routers running configuraion file.RAM also provides cache files and packet buffering capabilities.

 5. NVRAM

 Non-volatile RAM is used to route the routers start up configuration file.it does not lose data when power is switched off.

 Kindly share your comments.

 Thanking you

 Vinoth Kumar Sritharan
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