A
router is a device that has the ability to pass the IP packets from one network
to another network that may have a lot of lines between them. Routers that are
connected to the Internet network participate in a distributed routing
algorithm to determine the best path for the IP packets to pass through from one system to another
system. Routing process is
done in hop by hop. IP does not know the entire path
of the destination of each packet. IP routing only provides the IP address of
the next router that is closer to the destination host.
Router
functions:
It reads address logic / source IP
addresses and destination to determine the routing from one LAN to another LAN.
It stores the routing table to determine
the best route between one LAN to another WAN.
It is a device in layer 3 of the OSI
Layers.
It can be a "box" or an OS that
is running a routing daemon.
It Interfaces Ethernet, Serial, ISDN BRI.
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