Introduction to Router

Introduction to Router

What is router ---Router is a layer  3 ( OSI) device which is used to moves or forwards data packets from network to network.  

                Or

A devices which is used to connect different  different  networks.   

Functions  of   A   Router

                1.  Packet  Switching

                2.  Packet Filtering

                3.  Path selection

                4.  Internetworking  Communications

  Physically  Router is categorized as   

                Fixed Router      --No flexibility to add  interfaces.  Example --2500 series Router

                Modular Router -- Flexibility to add interfaces. Example-- 1700 /2600 etc.

Interfaces of router

    A router should have the  following  ports or interfaces. It varies series to series

                1.  Ethernet / Fast Ethernet / Gigabit Ethernet.

                2. AUI -Attachment User Interface

                3. Serial Interface

                4. BRI - Basic Rate Interface

                5. AUX

                6. Console

AUX and Console Port  Common for every router.